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:
Nov. 02, 1999
Filed:
Apr. 16, 1999
Applicant:
Inventor:
Russell A Johnston, Alvin, TX (US);
Assignee:
Camco International Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166386 ; 1663328 ; 137629 ;
Abstract
In a broad aspect, the invention relates to an improved downstop seal for use with a rod-piston actuator of a surface controlled subsurface safety valve, wherein the rod-piston actuator has a beveled shoulder formed thereon. The improved downstop seal has a resilient, primary, sealing member having a beveled sealing surface to matingly engage with a portion of the beveled shoulder of the rod-piston actuator; and further has a non-resilient, secondary, sealing member having a beveled sealing surface to matingly engage with a portion of the beveled shoulder of the rod-piston actuator.