Patents by Inventor Gerhard Philipp Humbert

Gerhard Philipp Humbert has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Components of a rotary piston machine
    Patent number: RE28918
    Abstract: The friction surface of a cast iron side wall member for a rotary piston engine is hardened by iontriding in an electrical glow discharge in a gas atmosphere containing nitrogen, after coating the areas not to be hardened, to inhibit glow discharge at those areas.
    Type: Grant
    Filed: March 11, 1974
    Date of Patent: July 27, 1976
    Assignee: Electrophysikaische Anstalt Bernard Berghaus
    Inventor: Gerhard Philipp Humbert