The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 2009
Filed:
Aug. 22, 2005
Applicant:
Mark A. Staggs, McAllester, OK (US);
Inventor:
Mark A. Staggs, McAllester, OK (US);
Assignee:
National Oilwell Varco, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 15/06 (2006.01); F16K 25/04 (2006.01);
U.S. Cl.
CPC ...
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.