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:
Apr. 29, 2003
Filed:
Jan. 23, 2001
Applicant:
Inventors:
David R. Mefford, The Woodlands, TX (US);
Paul M. Gutmann, Clute, TX (US);
Daryl L. Ard, Houston, TX (US);
Assignee:
Cooper Cameron Corporation, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 3/700 ;
U.S. Cl.
CPC ...
F16K 3/700 ;
Abstract
A visual signal of pressure between valve stem seals is given by a rising ring, which moves upwardly with the upper stem seal when there is pressure between the stem seals. The rising ring is held to the stem or valve body around the stem by a retaining ring. The rising ring, in its up position, precludes removal of the retaining ring.