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. 09, 1991
Filed:
Jul. 11, 1990
Applicant:
Inventor:
William A Blizzard, Jr, Houston, TX (US);
Assignee:
Camco International Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166323 ; 166334 ;
Abstract
A well safety valve having a flow tube telescopically controlling the movement of a valve element. A coil spring yieldably moves the tube in a direction for opening the valve and a choke bean is connected to the flow tube for controlling the closure of the valve. A spring-loaded release latch engages the flow tube yieldably preventing the flow tube from moving to the closed position. The latch is adjustable and includes a belleville spring for providing a large restraining force without undue deflection.