---
kind: "section"
citation: "43 U.S.C. § 2506"
title: "43"
title_heading: "Public Lands"
number: "2506"
heading: "Limitations of suits to annul patents"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/43/2506"
units:
  - "Chapter 43 — Suspended Entries and Claims; Patents"
---

# §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.


## Source credit

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

## Notes

### Editorial Notes

### Codification

Section was formerly classified to section 1166 of this title prior to editorial reclassification and renumbering as this section.