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:
May. 01, 1984
Filed:
Aug. 20, 1981
Applicant:
Inventor:
Donald F Hushbeck, Duncan, OK (US);
Assignee:
Halliburton Company, Duncan, OK (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166317 ; 166332 ;
Abstract
A circulation valve includes a cylindrical housing having an open bore therethrough and a circulating port through a wall thereof. A valve mandrel is slidably received in the housing and movable from a closed position closing the circulating port to an open position opening the circulating port. The circulating port is in fluid communication through an inner bore of the valve mandrel with the open bore of the housing above the valve mandrel when the valve mandrel is in its open position. A shear pin initially retains the valve mandrel in its closed position. A spring moves the valve mandrel to its open position upon shearing of the shear pin.