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. 26, 2013
Filed:
Nov. 25, 2009
Applicants:
Shawn James Nielsen, Spruce Grove, CA;
Sinisa Dobrijevic, Edmonton, CA;
Inventors:
Shawn James Nielsen, Spruce Grove, CA;
Sinisa Dobrijevic, Edmonton, CA;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 3/02 (2006.01); E21B 19/18 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of protecting a top drive drilling assembly includes incorporating a shock absorbing sub incorporated in the top drive drilling assembly. The shock absorbing sub comprises a first body and a second body capable of relative axial movement, with a shock absorbing medium disposed between the first body and the second body to absorb any reactive axial force exerted upon the top drive drilling assembly.