---
kind: "section"
citation: "43 C.F.R. § 3863.1-2"
title: "43"
number: "3863.1-2"
heading: "Proof of improvements for patent."
url: "https://uscodex.org/cfr/43/3863.1-2"
---

# §3863.1-2. Proof of improvements for patent.


The proof of improvements must show their value to be not less than $500 and that they were made by the applicant for patent or his grantors. This proof should consist of the statement of two or more disinterested witnesses.


## Notes

### Source

Source: 35 FR 9758, June 13, 1970, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 22 et seq.; 31 U.S.C. 9701; 43 U.S.C. 1701 et seq.