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:
Nov. 19, 1985
Filed:
Jul. 12, 1984
Applicant:
Inventors:
Charles E Jennings, Houston, TX (US);
Charles D Bridges, Houston, TX (US);
Warren D King, Houston, TX (US);
Assignee:
Gray Tool Company, Houston, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
166 53 ; 137 72 ; 166317 ; 166363 ; 166 751 ;
Abstract
The existance of fire at or near an oil field wellhead is sensed by a eutectic body which holds a valve system in a cocked position. When the eutectic is melted, the valves are positioned to terminate communication of a hydraulic fluid pressure source with a downhole safety valve and open a bleed conduit connected with the conduit to the downhole valve. A second eutectic body will melt at a different temperature than the first, providing a second position for the valve system which closes the conduit to the downhole valve and atmosphere to give positive isolation from the oil well fluid.