22 U.S.C. § 2356: Patents and technical information

an invention or discovery covered by a patent issued by the United States Government is practiced within the United States without the authorization of the owner, or information, which is (A) protected by law, and (B) held by the United States Government subject to restrictions imposed by the owner, is disclosed by the United States Government or any of its officers, employees, or agents in violation of such restrictions, Before suit against the United States Government has been instituted, the head of the agency of the United States Government concerned may settle and pay any claim arising under the circumstances described in subsection (a) of this section. No claim may be paid under this subsection unless the amount tendered is accepted by the claimant in full satisfaction. Funds appropriated pursuant to this chapter shall not be expended by the United States Government for the acquisition of any drug product or pharmaceutical product manufactured outside the United States if the manufacture of such drug product or pharmaceutical product in the United States would involve the use of, or be covered by, an unexpired patent of the United States which has not previously been held invalid by an unappealed or un­appealable judgment or decree of a court of competent jurisdiction, unless such manufacture is expressly authorized by the owner of such patent.