Patents in which the Secretary of the interior has transferable interests, and under which he may issue licenses or sublicenses, are classified as follows:

(a) Class A. Patents, other than those referred to in paragraph (c) of this section, which are owned by the United States, as represented by the Secretary of the Interior, free from restrictions on licensing except such as are inherent in Government ownership;

(b) Class B. Patents in which the interest of the United States, as represented by the Secretary of the Interior, is less than full ownership, or is subject to some express restriction upon licensing or sublicensing (including patents upon which the Secretary of the Interior holds a license, patents assigned to the Secretary of the Interior as trustee for the people of the United States, and patents assigned to the Secretary of the Interior upon such terms as to effect a dedication to the public);

(c) Class C. Patents and patent rights acquired by the Secretary of the Interior pursuant to the Act of April 5, 1944 (58 Stat. 190; 30 U.S.C. 321-325), and any amendments thereof.

[29 FR 260, Jan. 10, 1964, as amended at 31 FR 10796, Aug. 13, 1966]