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:
Apr. 16, 2002
Filed:
Mar. 09, 2000
Applicant:
Inventors:
Stephen Freeman, Beachwood, OH (US);
David Krus, University Heights, OH (US);
Donald Moracz, Independence, OH (US);
William D. Nielsen, Jr., Avon Lake, OH (US);
Diane Ryan, Kingwood, TX (US);
Assignee:
Brush Wellman, Inc., Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 1/7043 ; E21B 1/7046 ;
U.S. Cl.
CPC ...
E21B 1/7043 ; E21B 1/7046 ;
Abstract
An improved thin walled threaded spacer for use in preventing thread galling in adjacent sections of drill pipe in a drill string is formed by mechanically deforming a strip of copper/beryllium alloy containing 2% beryllium to form a preform having a hollow, truncated conical section and then mechanically deforming the conical section to impart helical grooves therein.