35 U.S.C. § 114

Models, specimens

The Director may require the applicant to furnish a model of convenient size to exhibit advantageously the several parts of his invention. When the invention relates to a composition of matter, the Director may require the applicant to furnish specimens or ingredients for the purpose of inspection or experiment.

( July 19, 1952, ch. 950 , 66 Stat. 799 ; Pub. L. 106–113, div. B, § 1000(a)(9) [title IV, § 4732(a)(10)(A)] , Nov. 29, 1999 , 113 Stat. 1536 , 1501A–582; Pub. L. 107–273, div. C, title III, § 13206(b)(1)(B) , Nov. 2, 2002 , 116 Stat. 1906 .)