United States Code · Section

§ 114 — Models, Specimens

35 U.S.C. § 114

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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.
35 U.S.C. § 113 35 U.S.C. § 115

Implementing Regulations