Ex Parte 6573099 et alDownload PDFBoard of Patent Appeals and InterferencesSep 29, 201090007247 (B.P.A.I. Sep. 29, 2010) 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. 90/007,247 10/04/2004 6573099 0687/74768 6310 23432 7590 09/29/2010 COOPER & DUNHAM, LLP 30 Rockefeller Plaza 20th Floor NEW YORK, NY 10112 EXAMINER PONNALURI, PADMASHRI ART UNIT PAPER NUMBER 3991 MAIL DATE DELIVERY MODE 09/29/2010 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 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. 90/008,096 05/18/2006 6573099 0687/74768 4110 23432 7590 09/29/2010 COOPER & DUNHAM, LLP 30 Rockefeller Plaza 20th Floor NEW YORK, NY 10112 EXAMINER PONNALURI, PADMASHRI ART UNIT PAPER NUMBER 3991 MAIL DATE DELIVERY MODE 09/29/2010 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 BOARD OF PATENT APPEALS AND INTERFERENCES ____________ Ex parte COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Appellant and Patent Owner ____________ Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 Technology Center 3900 ____________ Before ROMULO H. DELMENDO, RICHARD M. LEBOVITZ, and JEFFREY B. ROBERTSON, Administrative Patent Judges. LEBOVITZ, Administrative Patent Judge. DECISION ON APPEAL1 1 The two-month time period for filing an appeal or commencing a civil action, as recited in 37 C.F.R. § 1.304, or for filing a request for rehearing, as recited in 37 C.F.R. § 41.52, begins to run from the "MAIL DATE" shown on the PTOL-90A cover letter attached to this decision. Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 2 This is a decision on the appeal by the Patent Owner of U.S. Patent No. 6,573,099 from the Patent Examiner’s rejections of claims 4-7 and 10- 24 in an ex parte reexamination proceeding. The Board’s jurisdiction for this appeal is under 35 U.S.C. §§ 6(b), 134(b), and 306. We reverse. STATEMENT OF THE CASE U.S. Patent No. 6,573,099 (hereinafter “the ‘099 patent”) issued June 3, 2003. The named inventor is Michael Wayne Graham. A First Request for Ex Parte Reexamination of claims 1-22 of the ‘099 patent was filed by a Third-Party Requester, Nucleonics, Inc. (“Requester”) on October 4, 2004, pursuant to 35 U.S.C. §§ 302-307 and 37 C.F.R § 1.510 (“First Request”). Reexamination was sought on the basis of several prior art publications. A Second Request for Ex Parte Reexamination was filed by Nucleonics on May 18, 2006, in light of prior art discovered after filing of the First Request and not considered during prosecution of the ‘099 patent (Second Req. 1). The cited publications included Szyf, Zamecnik, Urdea, and the Fire published patent application, which claimed benefit to a provisional application filed December 23, 2007 (Second Req. 13). Szyf, Zamecnik, and the Fire published patent application are cited in the rejections on appeal in this reexamination proceeding. Reexamination was granted by the Examiner in response to both the First and Second Requests (Order Granting Request for Reexamination, mailed Dec. 7, 2004; Order Granting Request for Reexamination, mailed July 20, 2006). In accordance with 37 C.F.R. § 1.565(c), the reexamination proceedings were merged (Decision merging reexamination proceedings, mailed Oct. 26, 2006). In a Final Rejection dated November 26, 2008, Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 3 patented claims 4-7 and 10-28 were rejected. The rejection was appealed and an Appeal Brief was filed July 27, 2009, by the owner of the patent at the time the Brief was filed, Commonwealth Scientific and Industrial Research Organisation (hereinafter “CSIRO”) (App. Br. 8 (Appeal Brief, filed Jul. 27, 2009)). The appealed claims are directed to double-stranded DNA constructs and methods of transfecting animal cells with the constructs. The constructs produce double-stranded RNA when introduced (“transfecting”) into a cell. The double-stranded RNA has strands complementary to a target gene in the animal cell, and when expressed from the construct, the RNA delays or represses expression of the target gene. In other words, the double-stranded RNA can be used to turn a gene of interest off in an animal cell. Claims 4-7 and 10-24 are pending and stand rejected. The rejection is appealed. Claims 1-3, 8, and 9 were cancelled (App. Br. 10). Claims 25-28, were previously rejected, but now are allowed (Ans. 3). The Examiner rejected the claims as follows: Claims 5-7 and 11-24 under 35 U.S.C. § 103(a) as obvious in view of the Fire patent2 or Fire patent application publication3 and Szyf,4 Zamecnik,5 and Tang6 (Ans. 4); and 2 U.S. Patent 6,506,559 B1, issued Jan. 14, 2003. 3 US 2003/0056235 A1, published Mar. 20, 2003. 4 U.S. Patent 5,578,716, issued Nov. 26, 1996. 5 WO 97/11170, published Mar. 27, 1997. 6 Jin yan Tang, Jamal Temsamani, and Sudhir Agrawal, “Self-stabilized antisense oligodeoxynucleotide phosphorothioates: properties and anti-HIV Activity, 21 Nucleic Acids Res., 11, 2729-2735 (1993). Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 4 Claims 4, 6, and 10-22 under 35 U.S.C. § 103(a) as obvious in view of the Fire patent or Fire patent application publication and Szyf, Zamecnik, and Tang (or Szyf, Bissler,7 and Chou8), and Conrad.9 Claims 4 and 5 were amended during the reexamination proceeding. Claims 4 and 5 are representative and read as follows (underling and brackets show the claim amendments): Claim 4: An isolated [genetic] double-stranded DNA construct which is capable of delaying, repressing or otherwise reducing the expression of a target gene in an animal cell which is transfected with said [genetic] double-stranded DNA construct, wherein said [genetic] double-stranded DNA construct comprises at least two identical copies of a structural gene sequence and each identical copy of said structural gene sequence is separately placed under the control of a promoter which is operable in said cell, and wherein said structural gene sequence comprises a nucleotide sequence which is substantially identical to [at least] a region of said target gene, wherein at least one identical copy of said structural gene sequence is placed operably in the sense orientation under the control of an individual promoter sequence, and wherein at least one other identical copy of said structural gene sequence is placed operably in the antisense orientation under the control of another individual promoter sequence. Claim 5: An isolated [genetic] double-stranded DNA construct which is capable of delaying, repressing or otherwise reducing the expression of a target gene in an animal cell which is transfected with said [genetic] double-stranded DNA construct, 7 John J. Bissler, “DNA Inverted Repeats and Human Disease,” 3 Frontiers in Bioscience, 408-418 (1998). 8 Shan-Ho Chou, Ko-Hsin Chin and Andrew H.-J. Wang, Unusual DNA duplex and hairpin Motifs, 31 Nucleic Acids Research 10, 2461-2474 (2003). 9 U.S. Patent 6,054,299, issued Apr. 25, 2000. Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 5 wherein said [genetic] double-stranded DNA construct comprises at least two identical copies of a structural gene sequence, wherein said structural gene sequence comprises a nucleotide sequence which his substantially identical to [at least] a region of said target gene, and wherein said at least two identical copies of said structural gene sequence are placed operably under the control of a single promoter sequence which is operable in said cell, wherein at least one identical copy of said structural gene sequence is placed operably in the sense orientation under the control of said promoter sequence, wherein at least one other identical copy of said structural gene sequence is placed operably in the antisense orientation under the control of said promoter sequence, and wherein said at least one identical copy of said structural gene sequence that is placed in the sense orientation relative to said promoter and said at least one identical copy of said structural gene sequence that is placed in the antisense orientation relative to said promoter are spaced from each other by a nucleic acid stuffer fragment. OBVIOUSNESS OVER FIRE PATENT OR FIRE PATENT APPLICATION, AND SZYF, ZAMECNIK, AND TANG Claims 5-7 and 11-24 stand rejected under 35 U.S.C. § 103(a) as obvious in view of the Fire patent or published Fire patent application, and Szyf, Zamecnik, and Tang. Issue Would it have been obvious to a person of ordinary skill in the art to have made the construct of claim 5 by modifying Fire’s single self- complementary RNA with a stuffer fragment, as taught by each of Szyf, Zamecnik, and Tang? Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 6 Legal Principle “An obviousness determination requires that a skilled artisan would have perceived a reasonable expectation of success in making the invention in light of the prior art.” Amgen, Inc. v. F. Hoffmann-La Roche Ltd., 580 F.3d 1340, 1362 (Fed. Cir. 2009). Facts (“F”) Fire Provisional Application10 1. Fire discloses that double-stranded RNA inhibits gene expression. Fire teaches that the double-stranded RNA structure used to inhibit gene expression “may be formed by a single self-complementary RNA strand or multiple complementary strands.” (Fire, p. 6, ll. 18-20). 2. “RNA may be synthesized either in vivo or in vitro . . . . For transcription from a transgene in vivo or an expression vector, a regulatory region (e.g., promoter, enhancer, silencer) is used to transcribe the RNA strand(s).” (Id. at 7, ll. 11-15.) (See also id. at 11, ll. 18-23; 12, ll. 10-12.) 3. Fire teaches: The present invention differs from antisense-mediated interference in both approach and effectiveness . . . . Double-stranded RNA-mediated inhibition has advantages both in the stability of the material to be delivered and the concentration required for effective inhibition. Below, we disclose that in the model organism C. elegans, the present invention is at least 100-fold more 10 Hereinafter “Fire.” The disclosure of the Fire provisional application, filed Dec. 23, 1997, is relied upon as prior art because its filing date is before the March 20, 1998 priority date and the June 19, 1998 United States application filing date of the ‘099 patent. Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 7 effective than an equivalent antisense approach (i.e., dsRNA [double-stranded RNA] is at least 100-fold more effective than the injection of purified antisense RNA in reducing gene expression). These comparisons also demonstrate that inhibition by double-stranded RNA must occur by a mechanism distinct from antisense interference. (Id. at p. 4, ll. 11-22.) 4. Fire teaches that the double-stranded RNA structure was a “critical feature” for inhibiting gene expression (id. at p. 14, ll. 8-9, 22-25). Szyf 5. Szyf describes antisense oligonucleotides complementary to mRNA or double-stranded DNA that encodes mammalian DNA methyl transferase (Szyf, Abstract). 6. The oligonucleotides can comprise ribonucleotides and deoxyribonucleotides (id. at col. 4, ll. 4-10; col. 5, l. 65 to col. 6, l. 21). 7. In one embodiment, Szyf describes modified oligonucleotides self- stabilized “by having a self-complementary region that hybridizes intramolecularly with the oligonucleotide to form an exonuclease resistant hairpin-like structure” (id. at col. 6, ll. 48-51). 8. “Modified oligonucleotides according to this embodiment of the invention are generally characterized by having two regions: a DNA MeTase hybridizing region and a self-complementary region. The DNA MeTase hybridizing region has a nucleotide sequence that is complementary to an essential nucleic acid sequence of DNA MeTase.” (Id. at col. 6, 52-57). 9. “In this embodiment, the oligonucleotide is stabilized, i.e., rendered resistant to exonucleolytic degradation by base-pairing between the Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 8 target hybridizing region and the self-complementary region and/or by base- pairing between complementary sequences within the self-complementary region.” (Id. at col. 6, ll. 59-64). 10. “When the oligonucleotide encounters a DNA MeTase nucleic acid molecule having a complementary nucleic acid sequence, base-pairing between the DNA MeTase hybridizing region and the self-complementary region of the oligonucleotide is disrupted and replaced by base-pairing between the DNA MeTase hybridizing region of the oligonucleotide and the complementary nucleic acid sequence of the nucleic acid molecule.” (Id. at col. 6, l. 64 to col. 7, l. 4.) 11. “Either the hairpin structure or the hammer-like structure will presumably have loops of 4 or more nucleotides resulting from non-base- paired nucleotides. The number of base-pairs to be formed by intramolecular hybridization involving the self-complementary region may vary, but should be adequate to maintain a double-stranded structure so that the 3' end is not accessible to endonucleases.” (Id. at col. 7, ll. 29-37.) 12. Szyf describes an expression vector to express the antisense in cells. Zamecnik 13. Zamecnik describes antisense oligonucleotides that are oligoribonucleotides or oligodeoxyribonucleotides (Zamecnik, at p. 5, ll. 24- 27). 14. Zamecnik teaches that “self-stabilized or hairpin oligonucleotides” can be used having “a sequence at the 5’ and/or 3’ end which is capable of folding over and forming a duplex with itself. The Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 9 duplex region, which is preferably at least 4-6 bases joined by a loop of 3-6 bases, stabilizes the oligonucleotide against degradation.” (Id. at p. 8, ll. 2- 5). Tang 15. Tang describes self-stabilized oligodeoxynucleotides with hairpin loops at their 3’ ends which showed increased resistance to degradation (Tang, Abstract). Riggs Declaration 16. A declaration by Dr. Arthur D. Riggs, a professor of biology at the Beckman Research Institute of City of Hope, was executed on February 25, 2009, in support of the nonobviousness of the claims (hereinafter, “Riggs Decl.”). Analysis Claim 5 is directed to a double-stranded DNA construct with a single promoter in which an identical copy of a sense region of a target gene and an identical copy of an antisense region of the same target gene are “placed operably under control” of the promoter. The sense and antisense orientations are with respect to the single promoter. The sense and antisense copies “are spaced apart from each other by a nucleic acid stuffer fragment.” The Examiner found that Fire taught a single self-complementary RNA strand for inhibiting gene expression and that the RNA could be made in vivo with an expression vector comprising a promoter sequence (Ans. 4-5; F1 and F2). A self-complementary RNA would be understood, in light of Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 10 Fire’s disclosure, to mean an RNA with sense and antisense sequences of the same gene sequence oriented in such a way that it forms a double-stranded RNA structure when the sense and antisense sequences hybridize together (Ans. 5). A double-stranded RNA structure would be manufactured when the sense and antisense orientations of the same gene sequence relative to a single promoter sequence were inserted into a double-standed DNA construct that was subsequently expressed in a cell. The Examiner determined that the difference between Fire and claim 5 is that Fire did not expressly describe a “stuffer fragment” separating the sense and antisense sequences as recited in claim 5 (Ans. 5). However, the Examiner concluded that it would have been obvious to persons of ordinary skill in the art to have utilized a stuffer fragment in Fire “in order to facilitate and stabilize duplex oligonucleotide formation and further reduce target [gene] expression as taught by” the Szyf, Zamecnik, and Tang publications (id. at 5-6). The Examiner’s position, in a nutshell, is that it would have been obvious to have added a stuffer fragment to a self-complementary RNA in order to create a “hairpin” structure. A hairpin is a nucleic acid structure with a stem and loop, where the stem is a double-stranded region formed by two complementary nucleotide sequences hybridized together (the sense and antisense) and the loop is a single-stranded nucleic acid region between the two complementary sequences. The entire structure resembles a hairpin (or “bobby pin”) used to hold hair in place. According to the Examiner, a hairpin structure would have made Fire’s double-stranded RNA more stable, giving persons of ordinary skill in the art reason to have made it. (Ans. 15.) Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 11 The Examiner did not meet the burden of establishing prima facie obviousness of claim 5. The Examiner’s rationale as to why a hairpin structure would have been desirable was based on antisense technology. Antisense technology involves the hybridization of a single-stranded oligonucleotide to a target nucleic acid (such a a gene) in a cell. As argued by Appellant, Fire’s method of using double-stranded RNA to inhibit gene expression was expressly recognized by Fire as occurring by a mechanism distinct from single-stranded antisense gene technology, the type described in the cited Szyf, Zamecnik, and Tang publications (F3). Consistently, Dr. Arthur Riggs, a scientist, testified in a declaration that “antisense RNA technology . . . was another approach to gene silencing that was technically different from interference described by Fire.” (Riggs Decl. ¶ 8.) For this reason, Dr. Riggs testified that “it was clear that the interference described by Fire et al. was not working via an antisense mechanism, thus invalidating the theoretical parallel drawn by the Examiner” (id.) in relying on the anti-sense technologies of the Szyf, Zamecnik, and Tang publications. Fire’s objective was to create a double-stranded RNA because that particular RNA structure had been determined to be a critical feature for inhibiting gene expression (F4). The antisense technology cited by the Examiner relied on a single-stranded structure to inhibit gene expression, a mechanism and structure that Fire recognized was different from his own. The description in the prior art of the mechanism of the antisense technology is consistent with this finding (F7 and F10). Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 12 For the following independent reasons, we find that the Examiner did not provide an adequate reasoning to modify Fire with a loop (the “stuffer”) or that such modification would have been reasonably expected to add greater stability to the double-stranded RNA. First, as discussed above, Fire’s RNAs are already double-stranded, not single-stranded, as in all three of the cited antisense publications. Thus, Dr. Rigg’s testimony about the lack of a “theoretical parallel” between Fire and antisense technology is reasonable in view of the structural differences between the two constructs. Consequently, the evidence does not support the Examiner’s position that persons of ordinary skill in the art would have found the antisense teachings of the Szyf, Zamecnik, and Tang publications pertinent to Fire’s double-stranded RNA. Second, there is no evidence that a person of ordinary skill in the art would have reasonably expected that the proposed modification of Fire’s double-stranded RNA would have resulted in added stability as asserted by the Examiner. Fire stated that double-stranded RNA was advantageous as compared to antisense RNA because of “the stability of the material.” (F3). Fire also found double-stranded RNA to be a hundredfold more effective than antisense RNA (id.). Accordingly, there was no reason to have added a loop structure to the already double-stranded RNA to increase its stability, when the latter was recognized as more stable and more effective than antisense RNA. Third, double-stranded RNA technology for inhibiting gene expression was nascent. The only experimental system disclosed was Fire’s (Riggs Decl. ¶ 15). There was little information about what perturbations Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 13 and modifications could be made to the system, while still retaining its operability (id.). Therefore, there is insufficient evidence to establish a reasonable expectation of success that adding a stuffer fragment to produce a loop would have stabilized Fire’s self-complementary RNA without impeding its function. The Examiner contends that it would have been obvious to combine prior art methods and use known techniques “to improve similar devices (methods, or products) in the same way” and to choose from “predictable solutions” (Ans. 11). However, as indicated above, there is no evidence that applying antisense technology to Fire’s double-stranded RNA was simply applying a known technique to a similar product with a predictable solution. To the contrary, Fire taught that antisense RNA involved a different mechanism and required different structure features than those identified as critical in Fire’s double-stranded RNA technology. It was also argued by the Examiner that the cited references are in the same field of endeavor and address the same problem as Fire because they relate to inhibiting gene expression with self-complementary nucleic acid sequences which form double-stranded hairpin structures (Ans. 14-15 & 17). There is a fundamental difference between Fire and the cited antisense references: Fire used double-stranded RNA to inhibit gene expression while the antisense references used single-stranded antisense oligonucleotides. While such references may generally be in the same field of endeavor, the Examiner has not provided evidence that persons of ordinary skill in the art would have recognized that a technique to improve the stability of single- Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 14 stranded antisense RNA would be applicable to a double-stranded RNA, which achieves success by a distinctly different mechanism. The Examiner also stated that Fire’s self-complementary RNA formed hairpin loops (Ans. 9). However, the Examiner did not provide a reasonable basis upon which to believe that the self-complementary RNA described by Fire would have necessarily possessed such a structure. OBVIOUSNESS OVER FIRE PATENT OR FIRE PATENT PUBLICATION & CONRAD AND OTHER PRIOR ART Claims 4, 6, and 10-22 stand rejected under 35 U.S.C. § 103(a) as obvious in view of the Fire patent or Fire patent application publication and Szyf, Zamecnik, and Tang (or Szyf, Bissler, and Chou), and Conrad. Issue Would it have been obvious to a person of ordinary skill in the art to have utilized a DNA construct, as in claim 4, with separate promoters operable in animal cells to drive expression of two identical copies of a gene sequence, based on the teachings of Fire and Conrad? Facts (“F”) 17. Conrad describes a vector with T7 and T3 promoters (Conrad, col. 5, ll. 32-34). 18. The Examiner did not dispute Appellant’s statement that the T7 and T3 promoters are bacteriophage promoters, which “will not naturally function in animal cells.” (App. Br. 66.) Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 15 19. “Another option is to design the inverted repeats to contain eukaryotic or prokaryotic and/or prokaryotic receptor recognition sites, prom[o]ter, or promoter/enhancer elements to drive the expression of the target sequences in isolated cis-oriented fashion.” (Conrad, col. 3, ll. 60-63.) Analysis Claims 4 and 10 each require a double-stranded DNA construct with “two identical copies of a structural gene sequence and each identical copy of said structural gene sequence is separately placed under the control of a promoter.” Each promoter is recited in the claim to “be operable” in animal cells that have been transfected with the construct. The Examiner did not establish prima facie obviousness of claims 4 and 10. The Examiner did not dispute Appellant’s statement that the T7 and T3 promoters are bacteriophage promoters, which “will not naturally function in animal cells.” (F18.) Consequently, Conrad does not meet the elements of claims 4 and 10 that require a promoter to be operable in animal cells. The Examiner contends that the T7 and T3 promoters are “preferred embodiments,” and that Conrad additionally taught that the vectors may comprise eukaryotic or prokaryotic receptor recognition sites, promoters or promoter/enhancer elements to drive the expression of target in isolated cis-oriented fashion (see column 3, lines 60-63). Thus, it would have been obvious to a person of ordinary skill in the art to design vectors with promoters that are capable of expressing in animal cells. (Ans. 35.) Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 16 This argument is not persuasive. It is not evident how Conrad’s disclosure at column 3, lines 60-63 (F19) would have prompted a person of ordinary skill in the art to have replaced the bacteriophage promoters T7 and T3 with two eukaryotic promoters that are operable in animal cells. For example, the cited passage refers to replacing “inverted repeats,” not to the T7 and T3 promoters. The Examiner has not articulated a sufficient reason for modifying the T7/T3 vector to have arrived at the claimed invention. CONCLUSIONS OF LAW & SUMMARY The Examiner has not articulated a persuasive reason why a person of ordinary skill in the art would have found it obvious to have made the construct of claim 5 by modifying Fire’s single self-complementary RNA with a stuffer fragment as taught by Szyf, Zamecnik, and Tang. The obviousness rejection of claims 5-7 and 11-24 is reversed. The Examiner has not articulated a persuasive reason why a person of ordinary skill in the art, based on the teachings of Fire and Conrad, would have found it obvious to have utilized a DNA construct, as in claim 4, with separate promoters operable in animal cells to drive expression of two identical copies of a gene sequence. The obviousness rejection of claims 4, 6, and 10-22 is reversed. REVERSED Appeal 2010-006827 Reexamination Control 90/007,247 and 90/008,096 Patent 6,573,099 B2 17 bim FOR APPELLANT: GARY J. GERSHIK COOPER & DUNHAM, LLP 30 ROCKEFELLER PLAZA 20TH FLOOR NEW YORK, NY 10112 FOR THIRD PARTY REQUESTER: ERICH E. VEITENHEIMER COOLEY GODWARD, LLP 777 6TH STREET, NW SUITE 1100 WASHINGTON, DC 20001 Copy with citationCopy as parenthetical citation