KIPB LLC et al.Download PDFPatent Trials and Appeals BoardOct 27, 202090014227 - (D) (P.T.A.B. Oct. 27, 2020) Copy Citation UNITED STATES PATENT AND TRADEMARK OFFICE UNITED STATES DEPARTMENT OF COMMERCE United States Patent and Trademark Office Address: COMMISSIONER FOR PATENTS P.O. Box 1450 Alexandria, Virginia 22313-1450 www.uspto.gov APPLICATION NO. FILING DATE FIRST NAMED INVENTOR ATTORNEY DOCKET NO. CONFIRMATION NO. 90/014,227 10/31/2018 6885055 K107992.1010US.REX 8099 26158 7590 10/27/2020 WOMBLE BOND DICKINSON (US) LLP ATTN: IP DOCKETING P.O. BOX 7037 ATLANTA, GA 30357-0037 EXAMINER WHITTINGTON, KENNETH ART UNIT PAPER NUMBER 3992 MAIL DATE DELIVERY MODE 10/27/2020 PAPER Please find below and/or attached an Office communication concerning this application or proceeding. The time period for reply, if any, is set in the attached communication. PTOL-90A (Rev. 04/07) UNITED STATES PATENT AND TRADEMARK OFFICE ____________ BEFORE THE PATENT TRIAL AND APPEAL BOARD ____________ Ex parte KIPB LLC Patent Owner and Appellant ____________ Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 Technology Center 3900 ____________ Before JOHN A. JEFFERY, ERIC B. CHEN, and MINN CHUNG, Administrative Patent Judges. CHEN, Administrative Patent Judge. DECISION ON APPEAL Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 2 Pursuant to 35 U.S.C. §§ 134(b) and 306, Patent Owner1 appeals from the final rejection of claims 1–6, 11–13, and 15–17. Claims 7–10, 14, 18, and 19 were not subject to reexamination. We have jurisdiction under 35 U.S.C. § 6(b). An oral hearing was held on August 31, 2020. The record includes a written transcript of the oral hearing. We AFFIRM IN PART. STATEMENT OF THE CASE Reexamination Proceedings A request for ex parte reexamination of U.S. Patent No. 6,885,055 B2 (“the ’055 patent”) was filed on October 31, 2018, and assigned Reexamination Control No. 90/014,227. The ’055 patent, titled “Double- Gate FinFET Device and Fabricating Method Thereof,” issued April 26, 2005 to Jong-Ho Lee, based on Application No. 10/358,981, filed February 4, 2003. Claimed Subject Matter The claims are directed to an electrically stable double-gate FinFET device, in which the Fin active region is formed on a bulk silicon substrate and where the device channel and the body are to be formed has a nano-size 1 Patent Owner identifies the real party in interest as KIPB LLC (formerly KAIST IP US LLC). (Appeal Br. 4.) Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 3 width connected to the substrate and is formed with the shape of a wall along the channel length direction. (Abstract.) Related Litigation The ’055 patent has been asserted in KAIST IP US LLC v. Samsung Electronics Co., Ltd., No. 2:16-cv-01314 (E.D. Tex. Nov. 29, 2016). The jury found that defendants willfully infringed claims 1–6, 11–13, and 15–17 of the ’055 patent. (Appeal Br. 6.) The final judgement is currently appealed to the U.S. Court of Appeals for the Federal Circuit. (Reply Br. 5.) The ’055 patent has also been asserted in KAIST IP US LLC v. Samsung Electronics Co., Ltd., No. 2:19-cv-00056 (E.D. Tex. Feb. 14, 2019). The case is pending. (Appeal Br. 7.) The ’055 patent was also the subject of the petitions for inter partes review in the following proceedings: (i) Samsung Electronics Co. v. KAIST IP US LLC, Nos. IPR2017-01046 and IPR2017-01047 (PTAB Oct. 2, 2017); and (ii) Samsung Electronics Co. v. KAIST IP US LLC, Nos. IPR2018-00266 and IPR2018-00267 (PTAB May 29, 2018). Institution of inter partes review was denied in all of the aforementioned AIA proceedings. The Claims Claims 1 and 13 are illustrative of the claimed subject matter, and are reproduced below with disputed limitations in italics: 1. A double-gate FinFET device, comprising: a bulk silicon substrate; Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 4 a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate; a second oxide layer which is formed up to a certain height of the Fin active region from the surface of bulk silicon substrate; a gate oxide layer which is formed on both side-walls of the Fin active region protruded from said second oxide layer; a first oxide layer which is formed on the upper surface of said Fin active region with a thickness greater or equal to that of the gate oxide; a gate which is formed on said first and second oxide layer; a source/drain region which is formed on both sides of the Fin active region except where said gate overlaps with the Fin active region; and a contact region and a metal layer which are formed at said source/drain and gate contact region, wherein the thickness of said gate oxide layer is between 0.5 nm and 10 nm, and the thickness of said first oxidation layer is between 0.5 nm and 200 nm. 13. A double-gate FinFET device, comprising: a bulk silicon substrate; a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate; a second oxide layer which is formed up to a certain height of the Fin active region from the surface of bulk silicon substrate; a gate oxide layer which is formed on both side-walls of the Fin active region protruded from said second oxide layer; Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 5 a first oxide layer which is formed on the upper surface of said Fin active region with a thickness greater or equal to that of the gate oxide; a gate which is formed on said first and second oxide layer; a source/drain region which is formed on both sides of the Fin active region except where said gate overlaps with the Fin active region; and a contact region and a metal layer which are formed at said source/drain and gate contact region, wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate. REFERENCES Name Reference Date Hisamoto et al. US 5,115,289 May 19, 1992 Chen et al. US 6,720,619 B1 Apr. 13, 2004 Mizuno et al. JP 1996-139325 A May 31, 1996 Inokawa et al. JP 2,633,001 B2 Apr. 25, 1997 Yagishita et al. JP H10-93093 A Apr. 10, 1998 Patent Owner also relied upon the following in rebuttal to the Examiner’s rejections: Declaration under 37 C.F.R. § 1.132 of Kelin J. Kuhn, Ph.D., dated April 13, 2019. Supplemental Declaration under 37 C.F.R. § 1.132 of Kelin J. Kuhn, Ph.D., dated September 18, 2019. Rebuttal Declaration under 37 C.F.R. § 1.132 of Kelin J. Kuhn, Ph.D., dated May 25, 2020. Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 6 The Rejections A. Claims 1, 5, 6, and 13 stand rejected under 35 U.S.C. § 102(b) as being anticipated by Inokawa. B. Claims 2–4, 16, and 17 stand rejected under 35 U.S.C. § 103(a) as being unpatentable over Inokawa and Yagishita. C. Claim 15 stands rejected under 35 U.S.C. § 103(a) as being unpatentable over Inokawa and Chen. D. Claims 1–6, 13, 16, and 17 stand rejected under 35 U.S.C. § 102(b) as being anticipated by Hisamoto. E. Claims 4, 5, 11, 12, and 17 stand rejected under 35 U.S.C. § 103(a) as being unpatentable over Hisamoto. F. Claim 15 stands rejected under 35 U.S.C. § 103(a) as being unpatentable over Hisamoto and Chen.2 G. Claims 1–6, 13, 16, and 17 stand rejected under 35 U.S.C. § 103(a) as being unpatentable over Mizuno. H. Claim 15 stands rejected under 35 U.S.C. § 103(a) as unpatentable over Mizuno and Chen. 2 Patent Owner has not presented any arguments with respect to the rejection of: (i) dependent claims 2–4, 16, and 17 under 35 U.S.C. § 103(a) as unpatentable over Inokawa and Yagishita; (ii) dependent claim 15 under 35 U.S.C. § 103(a) as unpatentable over Inokawa and Chen; (iii) dependent claims 4, 5, 11, 12, and 17 under 35 U.S.C. § 103(a) as unpatentable over Hisamoto; and (iv) dependent claim 15 under 35 U.S.C. § 103(a) as unpatentable over Hisamoto and Chen. Thus, any such arguments are deemed to be waived. Accordingly, we sustain these rejections under 35 U.S.C. § 103(a). Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 7 OPINION § 102 Rejection—Inokawa Claims 1, 5, and 6 We are unpersuaded by Patent Owner’s arguments (Appeal Br. 41– 45) that Inokawa does not disclose the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate,” as recited in independent claim 1. The Examiner found that channel region 3 of Inokawa formed over substrate 1, as illustrated in Figure 1(d) of Inokawa, corresponds to the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” (Final Act. 16; see also Ans. 14.) In particular, the Examiner found that “the Fin active region 3 is shown connected to the substrate 1, albeit through a narrowed region.” (Ans. 14.) We agree with the Examiner’s findings. Inokawa relates to an insulated gate field effect transistor (IG-FET) (p. 4, col. 2, para. 2) having a “protruding or plate-like semiconductor region . . . vertically disposed on the substrate, such that the active region is structured to contact the semiconductor substrate at a narrow surface including the direction connecting the source region and the drain region” (p. 7, col. 2, para. 1). Figure 1(d) of Inokawa, a cross-sectional view of an IG-FET, which includes thin plate-like Si 9 (or channel region 3), monocrystalline Si substrate 1, and field oxide film 2, is reproduced below: Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 8 Figure 1(d) of Inokawa illustrates a cross-sectional view of an IG-FET. Inokawa explains that “the IG-FET of the present embodiment has thin plate-like Si 9 having a height H and a thickness D arranged vertically with respect to the monocrystalline Si substrate 1” and “field oxide film [2] for element isolation, such as an oxidized Si film, and the thin plate-like Si 9 . . . is in contact with the substrate 1 through an opening formed in the film 2.” (P. 4, col. 2, para. 2.) As illustrated in Figure 1(d), the “contact” interface between channel region 3 and substrate 1 is indicated by a dashed line. Moreover, Inokawa explains the following: With the above structure, the box-type channel region 3 bounded by the gate oxide film 4 is surrounded on six surfaces, a first surface being in contact with the source region 6 and a second surface opposite to the first surface being in contact with the drain region 7. A third surface including the direction connecting the source region 6 and the drain region 7 is in contact with the substrate 1. (Id. para. 3.) Figure 4(a) of Inokawa, which illustrates a cross-sectional view of Si substrate 1 and plate-like Si 9 during one step in the manufacturing process, is reproduced below: Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 9 Figure 4(a) of Inokawa illustrates a cross-sectional view of Si substrate 1 and plate-like Si 9. In reference to Figure 4(a), Inokawa explains that “directional etching was performed on the nitride film 62, the oxide film 14, and the Si substrate 1 using a simple resist pattern as a mask to obtain the structure of the protruding or plate-like Si 9 shown.” (P. 5, col. 2, para. 5.) Figure 4(c) of Inokawa, which illustrates a cross-sectional view of Si substrate 1, plate-like Si 9, and field oxide film 2 during another step in the manufacturing process, is reproduced below: Figure 4(c) of Inokawa illustrates a cross-sectional view of Si substrate 1, plate-like Si 9, and field oxide film 2 In reference to Figure 4(c), Inokawa explains the following: Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 10 The field oxide film 2 was formed by selectively thermally oxidizing the planar portion of the substrate l to a thickness or 200 to 600 nm using the nitride films 62 and 64 attached to the periphery of the plate-shaped Si 9 as a mask. Subsequently, after removing the nitride films 62 and 64 with hot phosphoric acid, the thin oxide films 61 and 63 covering the plate-like Si 9 were removed . . . . (P. 5, col. 2, last para.) Because Inokawa explains that: (i) plate-like Si 9, which is later formed into channel region 3, is in contact with substrate 1 through an opening formed in field oxide film 2; and (ii) one surface of tile box-type channel region 3 contacts substrate 1, Inokawa discloses the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” First, Patent Owner argues that Inokawa does not disclose “analogous ‘Fin active Regions’ (viz., Inokawa’s ‘box type channel region 3’. . . ) . . . on the surface of the substrate” because “an intermediate silicon material . . . is disposed between the analogous ‘Fin active region’. . . and the surface of the substrate.” (Appeal Br. 41.) Patent Owner also points to paragraph 23 of the Supplemental Kuhn Declaration, which states the following: Neither Inokawa . . . disclose that their analogous “Fin active Regions” (i.e., Inokawa’s “box type channel region 3”. . .) are on the surface of the substrate. As the above annotated illustrations show [Figure 1(d) of Inokawa], each of those references teaches that an intermediate silicon material . . . is disposed between the analogous “Fin active region” and the surface of the substrate . . . . (Supp. Kuhn Decl. ¶ 23 (emphasis omitted).) Contrary to Patent Owner’s arguments, the Examiner found that the region between the two field oxide films 2 of Inokawa, directly beneath box type channel region 3 (i.e., Patent Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 11 Owner’s “intermediate silicon material”) is a part of substrate 1. Again, Inokawa explains that “thin plate-like Si 9 . . . is in contact with the substrate 1 through an opening formed in the film 2.” (P. 4, col. 2, para. 2.) Moreover, Figures 4(a) and 4(c) of Inokawa illustrate that thin plate-like Si 9, which is formed by directionally etching substrate 1, includes both: (i) box type channel region 3; and (ii) the silicon region immediately beneath box type channel region 3, between the two field oxide films 2 (i.e., Patent Owner’s “intermediate silicon material”). Second, Patent Owner argues that “the separation between their analogous Fin active regions and their substrates is a direct consequence of the specific fabrication process for those devices, namely, LOCal Oxidation of Silicon (‘LOCOS’)” and “[i]n the LOCOS fabrication process, silicon dioxide is used to oxidize the surface of the silicon, thereby creating an insulating oxide layer between the Fin active region and the silicon substrate.” (Appeal Br. 42.) Patent Owner also points to paragraph 110 of the Kuhn Declaration, which states the following: The bird’s beak ensures that the field oxide film 2 is significantly intruded under the projection and (more importantly) ensures that the channel region is electrically isolated from the substrate. . . . In every single Inokawa embodiment the field oxide 2 is significantly intruded under the projection. As a consequence of this, the monocrystalline substrate 1 in Inokawa is not “a bulk silicon substrate,” because field oxide film 2 serves as an insulating layer that isolates the channel regions from the substrate. The active region is not connected to, but instead physically isolated from, the substrate. This creates an SOI-like device, not a genuine bulk device. (Kuhn Decl. ¶ 110.) However, Patent Owner’s arguments are inconstant with Inokawa because Figure 1(d) of Inokawa indicates that the two field Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 12 oxide films 2 remain separated by an “opening formed in the [oxide] film 2.” Moreover, Figure 1(d) of Inokawa does not illustrate that the two field oxide films 2 encroach upon one another. Third, Patent Owner argues the following: Inokawa does state that its “box type channel region 3” is “connected to” and “in contact with” the semiconductor substrate, but that disclosure relates to the claims’ latter limitation “connected to said bulk silicon substrate”, not its former separate limitation “on a surface of the bulk silicon substrate”. Indeed, Inokawa makes clear that its “box type channel region 3” connects to (or is in contact with) the semiconductor substrate “through an opening formed in the [oxide layer] film 2” – that is, through the intermediate silicon material. (Appeal Br. 45 (emphases and footnote omitted).) Patent Owner also points to paragraph 24 of the Supplemental Kuhn Declaration, which states the following: Inokawa does state that its “box type channel region 3” is “connected to” and “in contact with” the semiconductor substrate, but that disclosure relates to the claims’ latter limitation “connected to said bulk silicon substrate”, not its former limitation “on a surface of the bulk silicon substrate”. I understand that the Examiners have interpreted “connected to” to include a connection through the intermediate silicon material, which I will use solely for purposes of this proceeding. (Supp. Kuhn Decl. ¶ 24 (emphases and citation omitted).) Again, the Examiner found that the region between the two field oxide films 2 of Inokawa, directly beneath box type channel region 3 (i.e., Patent Owner’s “intermediate silicon material”) is a part of substrate 1, and as discussed previously, such findings are supported by Inokawa. Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 13 Therefore, we agree with the Examiner that Inokawa discloses the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate,” as recited in claim 1. Accordingly, we sustain the rejection of independent claim 1 under 35 U.S.C. § 102(b). Claims 5 and 6 depend from claim 1, and Patent Owner has not presented any additional substantive arguments with respect to these claims. Therefore, we sustain the rejection of claims 5 and 6 under 35 U.S.C. § 102(b) for the same reasons discussed with respect to independent claim 1. Claim 13 We are persuaded by Patent Owner’s argument (Appeal Br. 48) that Inokawa does not disclose the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate,” as recited in independent claim 13. The Examiner found that the “enlarged/widened portion” of silicon between the two channel regions 2, as illustrated in Figure 1(d) of Inokawa, corresponds to the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” (Final Act. 20.) In particular, the Examiner found that “the Fin active region 3 expands in width with a rounded corner as it approaches the bulk silicon substrate 1.” (Id.) We do not agree with the Examiner’s findings. Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 14 As discussed previously, Figure 1(d) of Inokawa illustrates that the “contact” interface between channel region 3 and substrate 1 is indicated by a dashed line. Moreover, Inokawa explains that channel region 3 has a “box-type” shape. (P. 4, col. 2, para. 3.) Although the Examiner cited to the “enlarged/widened portion” of silicon between the two channel regions 2, as illustrated in Figure 1(d) of Inokawa, the Examiner has provided insufficient evidence to support a finding that Inokawa discloses the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” In particular, such “enlarged/widened portion” of silicon resides in substrate 1 of Inokawa, rather than channel region 3. Thus, on this record, the Examiner has not demonstrated that Inokawa discloses the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” Accordingly, we are persuaded by Patent Owner’s argument, as follows: In Inokawa . . . there can be no legitimate dispute that the silicon material through the oxide layer is significantly narrowed, directly contrary to the ’055 patent’s express claim language and teachings. By pointing to a tiny drawn chamfer at the bottom of that narrowed region – the so-called “bird’s beak” – as somehow satisfying the claim language is entirely unreasonable. (Appeal Br. 48 (citations omitted).) Therefore, we do not agree with the Examiner that Inokawa discloses the limitation “wherein the resistance of said Fin active region is reduced by Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 15 enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” Accordingly, we do not sustain the rejection of independent claim 13 under 35 U.S.C. § 102(b). § 102 Rejection—Hisamoto Claims 1–6, 16, and 17 We are unpersuaded by Patent Owner’s arguments (Appeal Br. 41– 45) that Hisamoto does not disclose the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate,” as recited in independent claim 1. The Examiner found that Fin active region 100 connected to substrate 10, as illustrated in Figures 3a–3c of Hisamoto, corresponds to the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” (Final Act. 28; see also Ans. 14.) In particular, the Examiner found that “[a]s shown in Hisamoto FIG. 3b . . . the Fin active region 100 is connected to the substrate 10, albeit through a narrowed region.” (Ans. 14.) We agree with the Examiner’s findings. Hisamoto relates to an FET “having a channel or a charge coupled portion formed in a thin semiconductor layer which is substantially perpendicular to the substrate.” (Abstract.) Figure 3c of Hisamoto, a cross- sectional view of an FET, including substrate 10, insulating layer 20, and semiconductor layer 100, is reproduced below: Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 16 Figure 3c of Hisamoto illustrates a cross-sectional view of an FET. Figure 3c of Hisamoto illustrates “Embodiment 2” of the FET, in which “the substrate crystal and the thin film (the semiconductor layer) are connected to each other, it is possible to form the insulating layer 20, having an opening, on the substrate, and to have epitaxial growth of the substrate crystal from such opening, thereby obtaining the semiconductor layer 100.”3 (Col. 10, ll. 60–63.) Moreover, Figure 3c of Hisamoto illustrates a dashed line that separates semiconductor layer 100 and substrate 10. With respect to “Embodiment 2,” Hisamoto further explains the following: In the device structure of the Embodiment 1, in the condition when the insulating layers extending from both sides are not connected to the lower part of the semiconductor layer, the effect of the separation between the element and the substrate by electric insulation will be lost. However, it is possible to have good control of electric characteristics of the channel due to field effect made by the gate on both sides, with 3 Paragraph 68 of the Rebuttal Kuhn Declaration states the following: Epitaxy (or epitaxial growth) is the process of growing single crystal material on a single crystal starting substrate. Meticulous attention to processing conditions allows new individual atoms to precisely bond to the crystal lattice of the underlying substrate, replicating that crystal lattice exactly. Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 17 respect to the channel produced in thin film semiconductor, or to maintain characteristics of the element suitable to integration. (Col. 10, ll. 35–45.) Because Hisamoto explains that semiconductor layer 100 is formed on substrate 10 via epitaxial growth through the opening in insulating layer 20, Hisamoto teaches the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” First, Patent Owner argues that Hisamoto does not disclose “analogous ‘Fin active regions’ (viz., . . . Hisamoto’s ‘semiconductor layer 100’) are on the surface of the substrate” because “an intermediate silicon material . . . is disposed between the analogous ‘Fin active region’ . . . and the surface of the substrate.” (Appeal Br. 41.) Patent Owner also points to paragraph 23 of the Supplemental Kuhn Declaration, which states the following: Neither . . . Hisamoto disclose[s] that their analogous “Fin active regions” (i.e., . . . Hisamoto’s “semiconductor layer 100”) are on the surface of the substrate. As the above annotated illustrations show [Figure 3(c) of Hisamoto], each of those references teaches that an intermediate silicon material . . . is disposed between the analogous “Fin active region” and the surface of the substrate. (Supp. Kuhn Decl. ¶ 23 (emphasis omitted).) Contrary to Patent Owner’s arguments, the Examiner found that the “narrow region” immediately beneath semiconductor layer 100 of Hisamoto, surrounded by two insulating layers 20 (i.e., Patent Owner’s “intermediate silicon material”) is a part of substrate 10. Again, Figure 3c of Hisamoto illustrates a dashed line that separates semiconductor layer 100 and substrate 10, and Hisamoto explains Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 18 that “the substrate crystal and the thin film (the semiconductor layer) are connected to each other, it is possible to form the insulating layer 20, having an opening, on the substrate, and to have epitaxial growth of the substrate crystal from such opening, thereby obtaining the semiconductor layer 100.” (Col. 10, ll. 58–63.) Second, Patent Owner argues that “the separation between their analogous Fin active regions and their substrates is a direct consequence of the specific fabrication process for those devices, namely, LOCal Oxidation of Silicon (‘LOCOS’)” and “[i]n the LOCOS fabrication process, silicon dioxide is used to oxidize the surface of the silicon, thereby creating an insulating oxide layer between the Fin active region and the silicon substrate.” (Appeal Br. 42.) Patent Owner also points to paragraph 343 of the Kuhn Declaration, which states the following: Hisamoto creates field oxide layer (20) by oxidizing underneath a nitride mask. The process is described several places in Hisamoto, with a representative description at 8:9–21, “It is possible to form thick field oxidation film selectively on the surface of the substrate 10, other than the semiconductor layer 100, by removing the silicon oxide film 152 in the portion not covered with silicon nitride films 701 and 700, in applying etching with mixture of various hydrofluoric acids on the above substrate and, further, in applying light etching on the silicon at the lower level of the semiconductor layer 100 by use of wet etching with HF/HNO solution, and then by field oxidation in wet environment of 1100° C. This oxide film becomes the insulating layer 20. At this time, due to growth of the oxide film from both sides, the extending oxidized films will be connected together, thereby separating the semiconductor layer 100 from the substrate 10.” (Kuhn Decl. ¶ 343.) However, the Kuhn Declaration discusses “Embodiment 1” of Hisamoto, rather than “Embodiment 2” of Hisamoto, Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 19 which was cited by the Examiner. Patent Owner’s arguments are inconstant with Hisamoto because Figure 3c of Hisamoto indicates that “it is possible to form the insulating layer 20, having an opening, on the substrate, and to have epitaxial growth of the substrate crystal from such opening, thereby obtaining the semiconductor layer 100.” (Col. 10, ll. 60–63.) Furthermore, Figure 3c of Hisamoto does not illustrate that the two insulating layers 20 encroach upon one another. Last, Patent Owner argues that that following: Similarly, Hisamoto states that the “substrate crystal and the thin film (the semiconductor layer [100]) are connected to each other”, but that disclosure again relates to the claims’ latter limitation “connected to said bulk silicon substrate”, not its former separate limitation “on a surface of the bulk silicon substrate”. Indeed . . . Hisamoto makes clear that its “semiconductor layer 100” connects to the semiconductor substrate through “the insulating layer 20, having an opening” – that is, through the intermediate silicon material. (Appeal Br. 46.) Again, the Examiner found that the “narrow region” immediately beneath semiconductor layer 100 of Hisamoto, surrounded by two insulating layers 20 (i.e., Patent Owner’s “intermediate silicon material”) is a part of substrate 10, and as discussed previously, such findings are supported by Hisamoto. Therefore, we agree with the Examiner that Hisamoto discloses the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate,” as recited in claim 1. Accordingly, we sustain the rejection of independent claim 1 under 35 U.S.C. § 102(b). Claims 2–6, 16, and 17 depend from claim 1, and Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 20 Patent Owner has not presented any additional substantive arguments with respect to these claims. Therefore, we sustain the rejection of claims 2–6, 16, and 17 under 35 U.S.C. § 102(b) for the same reasons discussed with respect to independent claim 1. Claim 13 We are persuaded by Patent Owner’s argument (Appeal Br. 48) that Hisamoto does not describe the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate,” as recited in independent claim 13. The Examiner found that the “enlarged/widened portion” of silicon between the two insulating layers 20, as illustrated in Figure 3c of Hisamoto, corresponds to the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” (Final Act. 35.) In particular, the Examiner found that “Fin active region 100 shrinks and expands within the second oxide layer 20.” (Id.) We do not agree with the Examiner’s findings. As discussed previously, Hisamoto explains that “it is possible to form the insulating layer 20, having an opening, on the substrate [10], and to have epitaxial growth of the substrate [10] crystal from such opening, thereby obtaining the semiconductor layer 100.” (Col. 10, ll. 60–63.) Moreover, Figure 3c of Hisamoto illustrates a dashed line that separates semiconductor layer 100 and substrate 10. Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 21 Although the Examiner cited to the “enlarged/widened portion” of silicon between the two insulating layers 20, as illustrated in Figure 3c of Hisamoto, the Examiner has provided insufficient evidence to support a finding that Inokawa discloses the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” In particular, such “enlarged/widened portion” between the two insulating layers 20 resides in substrate 1 of Hisamoto (i.e., below the dashed line separating semiconductor layer 100 and substrate 10 in Figure 3c of Hisamoto). On this record, the Examiner has not demonstrated that Hisamoto discloses the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” Accordingly, we are persuaded by Patent Owner’s argument, as follows: In . . . Hisamoto, there can be no legitimate dispute that the silicon material through the oxide layer is significantly narrowed, directly contrary to the ’055 patent’s express claim language and teachings. By pointing to a tiny drawn chamfer at the bottom of that narrowed region [Figure 3c of Hisamoto] – the so-called “bird’s beak” – as somehow satisfying the claim language is entirely unreasonable. (Appeal Br. 48 (citations omitted).) Therefore, we do not agree with the Examiner that Hisamoto describes the limitation “wherein the resistance of said Fin active region is reduced by enlarging the width of said Fin active region within the oxidation layer as it approaches the bulk silicon substrate.” Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 22 Thus, we do not sustain the rejection of independent claim 13 under 35 U.S.C. § 102(b). § 103 Rejection—Mizuno Claims 1–6 We are persuaded by Patent Owner’s arguments (Appeal Br. 52) that Mizuno would not have rendered obvious independent claim 1, which includes the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” The Examiner found that Fin active region 52 of Mizuno, as illustrated in Figure 17, corresponds to the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” (Final Act. 40; see also Ans. 18.) In particular, the Examiner found that “the Fin active region is the entire projection part 52 that includes an impurity layer 54 in the middle thereof” and “as shown in FIG. 17, this entire Fin active region/projection part 52 is connected to and on the surface of the substrate.” (Ans. 18.) We do not agree with the Examiner’s findings. Mizuno relates to a semiconductor device, in particular, “a substrate 1 having a projecting semiconductor element region.” (Abstract.) Figure 17 of Mizuno, which illustrates a perspective view of a metal oxide semiconductor (MOS) transistor, is reproduced below: Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 23 Figure 17 of Mizuno illustrates a perspective view of an MOS transistor. Mizuno explains that “by etching a p-type silicon substrate 51. . . a projection 52 having a width of 0.1 μm is formed, an insulating film 53 is embedded in the element isolation region.” (¶ 65.) Moreover, Mizuno explains that “boron ions are implanted into the projection 52, and consequently, a p-type impurity layer 54 . . . is formed at a position that is deeper than 0.3 μm from the upper surface of the projection 52.” (Id.) Moreover, Figure 17 of Mizuno illustrates that projection 52 directly contacts a p-type impurity layer 54, such that p-type impurity layer 54 is an intervening layer between projection 52 and substrate 51. Although the Examiner cited generally to Figure 17 of Mizuno, the Examiner has provided insufficient evidence to support a finding that Mizuno teaches the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” Because Figure 17 of Mizuno illustrates that p-type impurity layer 54 is an intervening layer between projection 52 and substrate 51, Mizuno does not teach the limitation “a Fin Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 24 active region . . . on a surface of the bulk silicon substrate,” as recited in claim 1. Accordingly, we are persuaded by Patent Owner’s argument that “Mizuno’s projection part 52 is a distinct layer between the distinct impurity layer 54 . . . and the distinct source/drain regions 57/58.” (Appeal Br. 52.) Therefore, we do not agree with the Examiner that Mizuno teaches the limitation “a Fin active region which is a wall-shape single crystalline silicon on a surface of the bulk silicon substrate and connected to said bulk silicon substrate.” Thus, we do not sustain the rejection of independent claim 1 under 35 U.S.C. § 103(a). Claims 2–6, 16, and 17 depend from claim 1. We do not sustain the rejection of claims 2–6, 16, and 17 under 35 U.S.C. § 103(a) for the same reasons discussed with respect to claim 1. Independent claim 13 recites limitations similar to those discussed with respect to claim 1. We do not sustain the rejection of claim 13 under 35 U.S.C. § 103(a) for the same reasons discussed with respect to claim 1. § 103 Rejection—Mizuno and Chen We do not sustain the rejection of dependent claim 15 under 35 U.S.C. § 103(a) as unpatentable over Mizuno and Chen for the same reasons as discussed previously with respect to the rejection of claims 1–6, 13, 16, and 17 as being unpatentable under 35 U.S.C. § 103(a) over Mizuno. Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 25 DECISION SUMMARY In summary: Claims Rejected 35 U.S.C. § Reference(s)/Basis Affirmed Reversed 1, 5, 6 102(b) Inokawa 1, 5, 6 13 102(b) Inokawa 13 2–4, 16, 17 103(a) Inokawa, Yagishita 2–4, 16, 17 15 103(a) Inokawa, Chen 15 1–6, 16, 17 102(b) Hisamoto 1–6, 16, 17 13 102(b) Hisamoto 13 4, 5, 11, 12, 17 103(a) Hisamoto 4, 5, 11, 12, 17 15 103(a) Hisamoto, Chen 15 1–6, 13, 16, 17 103(a) Mizuno 1–6, 13, 16, 17 15 103(a) Mizuno, Chen 15 Overall Outcome 1–6, 11, 12, 15–17 13 REQUESTS FOR EXTENSIONS OF TIME Requests for extensions of time in this ex parte reexamination proceeding are governed by 37 C.F.R. § 1.550(c). See 37 C.F.R. § 41.50(f). AFFIRMED IN PART msc Appeal 2020-004990 Reexamination Control 90/014,227 Patent 6,885,055 B2 26 PATENT OWNER: WOMBLE BOND DICKINSON (US) LLP ATTN: IP DOCKETING P.O. 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