Patents by Inventor John J. Sigman, Jr.

John J. Sigman, Jr. 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).

  • Plunge shaving machine
    Patent number: 4173920
    Abstract: A gear shaving machine employing plunge cut (radial infeed with no lateral traverse) in which the rate of relative infeed between a meshed gear-like tool and a work gear is controlled by hydraulic escapement mechanism.
    Type: Grant
    Filed: January 18, 1978
    Date of Patent: November 13, 1979
    Assignee: Lear Siegler, Inc.
    Inventor: John J. Sigman, Jr.