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:
Sep. 17, 1991
Filed:
Jun. 04, 1990
Applicant:
Inventor:
Chudleigh B Cochran, Houston, TX (US);
Assignee:
Lindsey Completion Systems, Inc., Midland, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166374 ; 166319 ; 166321 ; 166386 ;
Abstract
A circulating valve for use in oil field operations which is pressure operated without use of a wireline tool. The valve has a sleeve assembly with telescopically joined sleeve members normally closing off a circulation port in a mandrel. A pressure differential is utilized to shift the joined sleeve members to an unjoined condition opening the circulation ports. A second pressure differential is utilized to rejoin the sleeve members and close off the circulation ports. The sleeve members are independently shear pinned to the mandrel.