Patents by Inventor Gilman G. Christopher

Gilman G. Christopher 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).

  • Springloaded shutoff valve apparatus
    Patent number: 4682625
    Abstract: Shutoff valve apparatus includes a spring-loaded piston with two guide portions disposed in bores and the piston includes a fluid passage extending through the piston and communicating with one of the bores in which a guide element is disposed. Any back pressure works with the bias of the spring to help seat the valve piston to prevent fluid from leaking past the valve. Positive pressure from the working fluid opens the valve.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: July 28, 1987
    Inventor: Gilman G. Christopher