43 USC § 2506 - Limitations of suits to annul patents

---
identifier: "/us/usc/t43/s2506"
source: "usc"
legal_status: "official_prima_facie"
title: "43 USC § 2506 - Limitations of suits to annul patents"
title_number: 43
title_name: "PUBLIC LANDS"
section_number: "2506"
section_name: "Limitations of suits to annul patents"
chapter_number: 43
chapter_name: "SUSPENDED ENTRIES AND CLAIMS; PATENTS"
positive_law: false
currency: "119-84"
last_updated: "2026-04-17"
format_version: "1.1.0"
generator: "[email protected]"
source_credit: "(Mar. 3, 1891, ch. 559, 26 Stat. 1093; Mar. 3, 1891, ch. 561, § 8, 26 Stat. 1099.)"
---


# § 2506. Limitations of suits to annul patents

Suits by the United States to vacate and annul any patent shall only be brought within six years after the date of the issuance of such patents.

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**Source Credit**: (Mar. 3, 1891, ch. 559, 26 Stat. 1093; Mar. 3, 1891, ch. 561, § 8, 26 Stat. 1099.)

## Editorial Notes

### Codification

Section was formerly classified to  prior to editorial reclassification and renumbering as this section.