Patents Assigned to Sigmon Company
  • Expansible device
    Patent number: 4467701
    Abstract: An expansible device for exerting force which has a generally "S" shape cross-section, being formed by stepped diameter cylinder, and arrangements using such a device are disclosed. The device may exert sealing forces and be controlled by admission of fluid pressure which acts on a thin wall member so supported as to be subjected to compressive stress alone.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: August 28, 1984
    Assignee: Sigmon Company
    Inventor: James W. Sigmon