(a)Revival on the basis of unintentional delay. If the delay in reply by applicant or patent owner was unintentional, a petition may be filed pursuant to this section to revive an abandoned application or a reexamination prosecution terminated under § 1.550(d) or § 1.957(b) or limited under § 1.957(c) . (b)Petition requirements. A grantable petition pursuant to this section must be accompanied by: (1) The reply required to the outstanding Office action or notice, unless previously filed; (2) The