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. 08, 1994
Filed:
Nov. 19, 1993
Applicant:
Inventors:
Frank J Carlin, Houston, TX (US);
John F Price, Navasota, TX (US);
Assignee:
Grant TFW, Inc., , US;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166380 ; 138177 ; 166242 ; 175320 ; 285176 ;
Abstract
An apparatus and method are provided for enhancing fatigue properties of subterranean well drill pipe immediate the area of securement to a tool joint by providing a multi-ramp upset series on the drill pipe which, in effect, enhances fatigue resistance properties of the pipe by increasing the wall thickness on the end of the drill pipe conduit to a greater length than that found on prior art, conventional upsets adjacent the drill pipe. The increased length of this upset configuration provides a smoother transition from the thick upset adjacent the tool joint down to the thin drill pipe body.