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:
Nov. 06, 2001
Filed:
Oct. 08, 1999
Applicant:
Inventors:
Stephen F. Scott, Calgary, CA;
Kevin Nikiforuk, Calgary, CA;
Assignee:
Tesco Corporation, Calgary, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 1/702 ;
U.S. Cl.
CPC ...
E21B 1/702 ;
Abstract
A clamp for gripping casing strings is disclosed. A series of radially arranged spring biased slips are mounted in a housing attached to a top drive. A hydraulic system is used to release the slips from the gripping position upon a casing string.