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:
Feb. 10, 2009
Filed:
Apr. 28, 2006
Applicants:
Larry Wells, Yorba Linda, CA (US);
Svein Stubstad, Houston, TX (US);
Howard Ervin, Spring, TX (US);
James D. Brugman, Spring, TX (US);
Paul Conover, Cypress, TX (US);
Inventors:
Larry Wells, Yorba Linda, CA (US);
Svein Stubstad, Houston, TX (US);
Howard Ervin, Spring, TX (US);
James D. Brugman, Spring, TX (US);
Paul Conover, Cypress, TX (US);
Assignee:
Varco I/P, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 3/06 (2006.01); E21B 33/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A multi-seal sealing assembly with multiple seals so that when one seal wears out another can be moved into sealing position; and a top drive system for wellbore operations with such a sealing assembly; the sealing assembly in one aspect having a seal carrier movable to move at least one secondary seal into sealing position when a primary seal has worn out.