Section 60.26 - Final action on regulatory review period determinations(a) FDA will consider a regulatory review period determination to be final upon expiration of the 180-day period for filing a due diligence petition under § 60.30 unless FDA receives:(1) New information from PTO records, FDA records, or FDA centers that affects the regulatory review period determination;(2) A request under § 60.24 for revision of the regulatory review period determination;(3) A due diligence petition filed under § 60.30 ; or(4) A request for a hearing filed under § 60.40 .(b) FDA will notify PTO that the regulatory review period determination is final upon:(1) The expiration of the 180-day period for filing a due diligence petition; or(2) If FDA has received a request for a revision, a due diligence petition, or a request for a hearing, upon resolution of the request for a revision, the petition, or the hearing, whichever is later. FDA will send a copy of the notification to the applicant and file a copy of the notification in the docket established for the application in FDA's Dockets Management Staff (HFA-305), 5630 Fishers Lane, rm. 1061, Rockville, MD 20852.53 FR 7305, Mar. 7, 1988, as amended at 59 FR 14364, Mar. 28, 1994