Patents by Inventor Ronald Trammell

Ronald Trammell 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).

  • Unitized spherical profile check valve with replaceable sealing element
    Patent number: 6227240
    Abstract: A unitized check valve assembly comprises: a valve body having a bore therethrough, the bore having an inlet and an outlet, a valve disk engaging said body at said outlet, a valve retainer engaging the body and surrounding the valve disk and the outlet; a first biasing member in compression between the body and the valve retainer; and a second biasing member in compression between the body and the valve disk. The flow passage between the valve seat and the valve is continuous around the circumference of the valve. In a preferred embodiment, the valve body and the valve disk each have a mating surface, the mating surfaces define an interface therebetween, and the interface comprises a portion of a spherical surface.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: May 8, 2001
    Assignee: National-Oilwell L.P.
    Inventors: Samuel S. Wu, Ronald Trammell