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. 14, 1996
Filed:
Mar. 03, 1995
Applicant:
Inventor:
Thomas D Haley, Cypress, TX (US);
Assignee:
Stewart & Stevenson Services, Inc., Houston, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166 55 ;
Abstract
There are disclosed rams for blowout preventers having blades on their inner ends in position to shear or sever a pipe or other object extending within the bore of the preventer housing as the rams are moved within guideways intersecting the bore from outer positions, in which the bore is open, to inner positions in which shear edges on opposed faces of the blades pass over another. The rams also carry packing for sealing with respect to the guideways in which they move as well as with respect to one another to close off the bore following shearing of the object.