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. 03, 1991
Filed:
Aug. 17, 1990
Applicant:
Inventors:
Ronald K Churchman, Carrollton, TX (US);
Roddie R Smith, Plano, TX (US);
Assignee:
Otis Engineering Corporation, Dallas, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166386 ; 166321 ; 166332 ;
Abstract
A subsurface slide valve and flapper valve controlled by a single actuator responsive to control pressure from the surface. A shifting tool landable in a landing nipple and in response to pressure in the tubing first extending dogs to contact the actuator and then shifting the dogs downwardly to move the actuator to valve open position.