C. J. H. Hoffman

Claus J. H. Hoffman (c. 1865 - October 4, 1940) was a German-born watchmaker and inventor who, while resident in North Dakota, made repeated attempts to patent a perpetual motion machine of his devising. His efforts received some support from Senator Lynn Frazier of North Dakota, who proposed in June 1924 a joint resolution (S.J. Res. 139) "providing for the demonstration of the motor invented by Claus J. H. Hoffmann," which was referred to the Committee on Patents, though this seemingly came to little.