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:
Jul. 17, 1979
Filed:
Nov. 07, 1977
Applicant:
Inventors:
Henry A Bourne, Jr, Ponca City, OK (US);
Louis M Ayers, Houston, TX (US);
Minor R Wiseman, Newkirk, OK (US);
Assignee:
Continental Oil Company, Ponca City, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166 / ; 166 53 ; 166332 ; 251139 ;
Abstract
A wireline retrievable, subsurface tubing safety valve that is opened and held open by the transmission of electric current from the surface. Interruption of the current supply results in automatic closure of the valve. The device includes a pressure equalizing valve which enables the valve to be opened against a high differential pressure.