28 U.S.C. § 1744: Copies of United States Patent and Trademark Office documents, generally

Copies of letters patent or of any records, books, papers, or drawings belonging to the United States Patent and Trademark Office and relating to patents, authenticated under the seal of the United States Patent and Trademark Office and certified by the Under Secretary of Commerce for Intellectual Property and Director of the United States Patent and Trademark Office, or by another officer of the United States Patent and Trademark Office authorized to do so by the Director, shall be admissible in evidence with the same effect as the originals. Any person making application and paying the required fee may obtain such certified copies.