* * * The Secretary of the Interior and the Commissioner of Patents are authorized to grant any officer of the government, except officers and employes of the Patent Office, a patent for any invention of the classes mentioned in Section 4886 of the Revised Statutes, when such invention is used or to be used in the public service, without the payment of any fee: Provided, that the applicant in his application shall state that the invention described therein, if patented, may be used by the government or any of its officers or employes in the prosecution of work for the government, or by any other person in the United States, without the payment to him of any royalty thereon, which stipulation shall be included in the patent.

31 Lindsay vs. Stein, 10 Fed. Rep., 907.

Heads of Departments Requesting Expedition, to be Represented.

Section 7. That in every case where the head of any department of the government shall request the Commissioner of Patents to expedite the consideration of an application for a patent, it shall be the duty of such head of a department to be represented before the commissioner in order to prevent the improper issue of a patent.