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:
Feb. 24, 2004
Filed:
Jul. 09, 2001
Applicant:
Inventors:
Assignee:
FMC Technologies, Inc., Chicago, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 3/400 ; E21B 3/402 ;
U.S. Cl.
CPC ...
E21B 3/400 ; E21B 3/402 ;
Abstract
A valve assembly for hydrocarbon wells comprises a first valve (e.g., a conventional gate valve) and a second valve (e.g., a hydraulically operated, fail safe check valve). The second valve provides an alternative to the pressure barrier conventionally formed by a downhole annulus safety valve. It is installable/retrievable through the first valve using a tool of the type used for installation of surface wellhead VR (valve replacement) plugs.