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:
Dec. 13, 1983
Filed:
Jun. 25, 1981
Applicant:
Inventor:
Robert T Brooks, Kingwood, TX (US);
Assignee:
Baker International Corporation, Orange, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166319 ; 166321 ; 166334 ;
Abstract
The disclosure provides a valve for an annulus defined between a tubular work string or other conduit and a surrounding annular portion of an operative element disposed on production string, such as a safety valve. The annulus valve comprises an annular valve body, which may comprise an elastomeric mass, which is urged by resilient means into sealing engagement with the exterior of the tubular work string and is shiftable out of such sealing engagement, such as by an annular piston which is responsive to control fluid pressure. The same control fluid pressure may be utilized to operate the safety valve to its open position.