---
kind: "section"
citation: "37 C.F.R. § 1.945"
title: "37"
number: "1.945"
heading: "Response to Office action by patent owner in inter partes reexamination."
url: "https://uscodex.org/cfr/37/1.945"
---

# §1.945. Response to Office action by patent owner in inter partes reexamination.

- (a) The patent owner will be given at least thirty days to file a response to any Office action on the merits of the inter partes reexamination.
- (b) Any supplemental response to the Office action will be entered only where the supplemental response is accompanied by a showing of sufficient cause why the supplemental response should be entered. The showing of sufficient cause must include:
  - (1) An explanation of how the requirements of [§ 1.111(a)(2)(i)](/cfr/37/1.111.md?p=a-2-i) are satisfied;
  - (2) An explanation of why the supplemental response was not presented together with the original response to the Office action; and
  - (3) **A compelling reason to enter the supplemental response.**

## Notes

### Amendments

[72 FR 18906, Apr. 16, 2007]

### Source

Source: 65 FR 76777, Dec. 7, 2000, 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

[72 FR 18906, Apr. 16, 2007]