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:
Mar. 26, 2013
Filed:
Jun. 09, 2008
Applicants:
Scott Delbridge, Edmonton, CA;
Dean Foote, Edmonton, CA;
Inventors:
Scott Delbridge, Edmonton, CA;
Dean Foote, Edmonton, CA;
Assignee:
Alberta Petroleum Industries Ltd., Edmonton, Alberta, CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 33/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A hydraulically-operated annular blowout preventer, for controlling a wellbore and comprising a wiper seal assembly, is described. The wiper seal assembly comprises a discrete wiper seal, for preventing debris and/or contaminants from the wellbore from entering the hydraulic fluid chamber of the blowout preventer, a discrete pressure seal, positioned below and abutting the wiper seal in the same seal groove, for isolating the hydraulic chamber, and a retainer member for preventing both radial and axial movement of the wiper seal.