MPEP § 2754.01
An application for patent term extension under 35 U.S.C. 156(d)(1) may only be filed within the sixty-day period beginning on the date the product received permission under the provision of law under which the applicable regulatory review period occurred for commercial marketing or use. The statutory time period is not extendable and cannot be waived or excused. See U.S. Patent No. 4,486,425 (application for patent term extension was filed after the end of the 60-day period and was therefore denied). In a 2008 final agency action, the USPTO clarified its understanding that in view of the "beginning on" language of the statute, the first day of the sixty-day period is the day that the marketing applicant received approval from the regulatory agency. In other words, day one of the sixty-day period is the approval date, not the day after approval. In re: Pat. Term Extension Application for U.S. Pat. No. 5,817,338, 2008 WL 5477176, at *8 (Comm’r Pat. 2008). This understanding is grounded in the Federal Circuit’s explanation of the statutory language: "[S]ection 156(d)(1) admits of no other meaning than that the sixty-day period begins on the FDA approval date." Unimed, Inc. v. Quigg, 888 F.2d 826, 828, 12 USPQ2d 1644, 1646 (Fed. Cir. 1989). Thus, for example, if a marketing applicant receives approval from the regulatory agency prior to 4:30 P.M., Eastern Time, on the business day July 10, 2023 (day one of the count of sixty days), the application for patent term extension must be filed by September 7, 2023, in order to meet the timeliness requirement of 35 U.S.C. 156(d)(1).
For purposes of determining the date the product received permission under the provision of law under which the applicable regulatory review period occurred for commercial marketing or use, if such permission is transmitted after 4:30 P.M., Eastern Time, on a business day, or is transmitted on a day that is not a business day, the product shall be deemed to have received such permission on the next business day. The term "business day" in this context means any Monday, Tuesday, Wednesday, Thursday, or Friday, excluding any legal holiday under 5 U.S.C. 6103.
For drug products the approval date is the date of a letter by the Food and Drug Administration indicating that the application has been approved, even if the letter requires further action before the drug can be marketed. Mead Johnson Pharmaceutical Group v. Bowen, 838 F.2d 1332, 1336; 6 USPQ2d 1565, 1568 (D.C. Cir. 1988). For food or color additives, the relevant date is the effective date of the regulation or order, which is set forth in the regulation or order, and generally is the date that the regulation or order is published, e.g., in the Federal Register. See 21 U.S.C. 348(e). This date will generally be later than the date the approval is communicated to the marketing applicant. However, in the case of drug products for which the Secretary of Health and Human Services intends to recommend controls under the Controlled Substances Act, the time period is as described below.
Where the regulatory review is of a drug product for which the Secretary of Health and Human Services intends to recommend controls under the Controlled Substances Act, the sixty-day period of 35 U.S.C. 156(d)(1) begins on the "covered date," where the "covered date" (defined in 35 U.S.C. 156(i)(2) ) is the later of: