Patents by Inventor G. Pat Birch

G. Pat Birch 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).

  • Self-sealing sight glass for a fluid vessel
    Patent number: 5763776
    Abstract: A sight glass for a fluid vessel that includes a housing with facility for mounting to a fluid vessel wall, and a transparent window mounted within the housing for viewing fluid within the vessel from outside of the vessel wall. A valve mounted within the housing has a normally open position for permitting passage of fluid from within the vessel to adjacent the window, and a closed position for blocking such fluid passage. The valve includes structure responsive to one or more predetermined conditions at the sight glass for moving the valve to the closed position so as to block passage of fluid to the window, and thereby provide a visual indication of occurrence of the predetermined conditions from outside of the vessel.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: June 9, 1998
    Assignee: Vickers, Inc.
    Inventors: G. Pat Birch, Stephen Showalter