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:
Jun. 20, 1978
Filed:
Oct. 15, 1976
Applicant:
Inventor:
Herbert Allen, Houston, TX (US);
Assignee:
Cameron Iron Works, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
277 27 ;
Abstract
There is disclosed an annular blowout preventer having a packer comprising an annulus of resilient material which is movable from an open bore position to a constricted, closed bore position by means which include links arranged to exert a force on the packer having a radially inwardly directed component which increases with the force required to seal the packer about successively smaller pipes.