CFR›Title 9›Chapter I›Part 124›Subpart C ContainsSections 124.20–124.23CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart C—Regulatory Review Period Sections 124.20 § 124.20 Patent term extension calculation. 124.21 § 124.21 Regulatory review period determination. 124.22 § 124.22 Revision of regulatory review period determination. 124.23 § 124.23 Final action on regulatory review period determination. Previous B Subpart B—Eligibility Assistance Next D Subpart D—Due Diligence Petitions