Granted Patent
Utility
US 5,931,511 · App. 08/850,735
Threaded connection for enhanced fatigue resistance
Inventors:
Richard W. DeLange, Ed Evans, Jerry L. Buster
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: May 2, 1997
Inventors
Richard W. DeLange
Ed Evans
Jerry L. Buster
Assignee (at issue)
GRANT PRIDECO, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.