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. 11, 1978
Filed:
Sep. 10, 1976
Applicant:
Inventor:
Herbert Allen, Houston, TX (US);
Assignee:
Cameron Iron Works, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
251 / ; 251-5 ; 277 73 ;
Abstract
There is disclosed an annular blowout preventer having a packer which is surrounded by an annulus of resilient material, and an operating system which includes means for longitudinally compressing the outer annulus in order to constrict its inner circumference and thereby move the packer from an expanded position, in which it opens the bore through a housing in which the packer and outer annulus are received, to a constricted position in which it closes the bore by sealing about a pipe in the bore or upon itself.