37 CFR § 42.205 - Service of petition.

---
identifier: "/us/cfr/t37/s42.205"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 42.205 - Service of petition."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "42.205"
section_name: "Service of petition."
chapter_name: "UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "42"
part_name: "TRIAL PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "35 U.S.C. 2(b)(2), 3, 6, 21, 23, 41, 134, 135, 143, 153, 311, 312, 314, 316, 318, 321-326, 328; Pub. L. 112-29, 125 Stat. 284; and Pub. L. 112-274, 126 Stat. 2456."
regulatory_source: "77 FR 48669, Aug. 14, 2012, unless otherwise noted."
cfr_part: "42"
---


# 42.205 Service of petition.

In addition to the requirements of § 42.6, the petitioner must serve the petition and exhibits relied upon in the petition as follows:

(a) The petition and supporting evidence must be served on the patent owner at the correspondence address of record for the subject patent. The petitioner may additionally serve the petition and supporting evidence on the patent owner at any other address known to the petitioner as likely to effect service.

(b) Upon agreement of the parties, service may be made electronically. Service may be by Priority Mail Express® or by means at least as fast and reliable as Priority Mail Express®. Personal service is not required.

[77 FR 48669, Aug. 14, 2012, as amended at 79 FR 63043, Oct. 22, 2014]