Based on Title 35, U.S.C., 1946 ed., § 73 (R.S. 4929, amended (1) May 9, 1902, ch. 783, 32 Stat. 193, (2) Aug. 5, 1939, ch. 450, § 1, 53 Stat. 1212; R.S. 4933).

The list of conditions specified in the corresponding section of existing statute is omitted as unnecessary in view of the general inclusion of all conditions applying to other patents. Language is changed.