Patents by Inventor Robert C. Groll

Robert C. Groll 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).

  • Piston machine
    Patent number: 4442758
    Abstract: A piston machine, e.g. an internal-combustion engine, compressor or pump, in which a piston is reciprocatable in a cylinder and crankshaft is provided with an eccentric pin received in a transverse slot of the piston and preferably in a massive portion of the body thereof, so that piston rods and the like are avoided.
    Type: Grant
    Filed: July 7, 1981
    Date of Patent: April 17, 1984
    Inventor: Robert C. Groll