Patents by Inventor Mark Staggs

Mark Staggs 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).

  • Publication number: 20070039652
    Abstract: Apparatus and methods for constructing a valve assembly comprising an anti-friction ring. The anti-friction ring allows a closure member in the valve assembly to more freely rotate during operation of the valve assembly. Consequently, the closure member strikes a sealing member in different rotational positions during repetitive cycling of the valve assembly.
    Type: Application
    Filed: August 22, 2005
    Publication date: February 22, 2007
    Applicant: NATIONAL-OILWELL, L.P.
    Inventor: Mark Staggs
  • Publication number: 20060180209
    Abstract: Apparatus and methods for constructing a valve comprising a sealing member and a hollow ball operable to sealingly engage the sealing member. A guide housing disposed about said hollow ball and does not constrain rotation of said hollow ball. A spring is disposed between the hollow ball and the guide housing so as to bias the hollow ball into sealing engagement with the sealing member. The hollow ball is constructed from two unequal sized portions and may comprise a hollow, spherical body having an aperture and a plug sized so as to closely fit within the aperture.
    Type: Application
    Filed: February 14, 2005
    Publication date: August 17, 2006
    Applicant: NATIONAL-OILWELL, L.P.
    Inventors: Andrew Riley, Mark Staggs