---
kind: "section"
citation: "37 C.F.R. § 1.791"
title: "37"
number: "1.791"
heading: "Termination of interim extension granted prior to regulatory approval of a product for commercial marketing or use."
url: "https://uscodex.org/cfr/37/1.791"
---

# §1.791. Termination of interim extension granted prior to regulatory approval of a product for commercial marketing or use.


Any interim extension granted under [35 U.S.C. 156(d)(5)](/usc/35/156.md?p=d-5) terminates at the end of the 60-day period beginning on the date on which the product involved receives permission for commercial marketing or use. If within that 60-day period the patent owner or its agent files an application for extension under §§ [1.740](/cfr/37/1.740.md) and [1.741](/cfr/37/1.741.md) including any additional information required under [35 U.S.C. 156(d)(1)](/usc/35/156.md?p=d-1) not contained in the application for interim extension, the patent shall be further extended in accordance with the provisions of [35 U.S.C. 156](/usc/35/156.md).


## Notes

### Amendments

[60 FR 25619, May 12, 1995]

### Authority

Authority: 35 U.S.C. 2(b)(2), 154, and 156.

### Source

Source: 52 FR 9394, Mar. 24, 1987, unless otherwise noted.

### Authority

Authority: 35 U.S.C. 2(b)(2), unless otherwise noted.

### Source

Source: 24 FR 10332, Dec. 22, 1959, unless otherwise noted.

### Amendments

[60 FR 25619, May 12, 1995]