Patents by Inventor Doug Tanner

Doug Tanner 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).

  • Valve actuator with hydraulic damper
    Patent number: 4971288
    Abstract: A valve actuator for an associated valve which includes apparatus for opening and closing an associated valve and a first housing in which a first diaphragm is disposed to define first and second chambers on respective sides of the first diaphragm. The apparatus also includes a valve actuator having a housing in which is disposed a second diaphragm to define a third chamber. The valve actuator includes apparatus connecting the second diaphragm to the apparatus for opening and closing the valve; and fluid coupling apparatus connecting the second chamber and the third chamber. The apparatus for opening and closing the valve includes a crank arm carried on a shaft.
    Type: Grant
    Filed: October 20, 1989
    Date of Patent: November 20, 1990
    Assignee: General Signal Corporation
    Inventors: Doug Tanner, Greg Hegwer, Al Backes