37 CFR § 41.100 - Definitions.

---
identifier: "/us/cfr/t37/s41.100"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 41.100 - Definitions."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "41.100"
section_name: "Definitions."
chapter_name: "UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "41"
part_name: "PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "35 U.S.C. 2(b)(2), 3(a)(2)(A), 21, 23, 32, 41, 134, 135, and Public Law 112-29."
regulatory_source: "69 FR 50003, Aug. 12, 2004, unless otherwise noted."
cfr_part: "41"
---


# 41.100 Definitions.

In addition to the definitions in § 41.2, the following definitions apply to proceedings under this subpart:

*Business day* means a day other than a Saturday, Sunday, or Federal holiday within the District of Columbia.

*Involved* means the Board has declared the patent application, patent, or claim so described to be a subject of the contested case.