View all text of Subpart 3863 [§ 3863.1 - § 3863.1-4]
§ 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.