Granted Patent
Utility
US 6,609,735 · App. 09/358,205
Threaded and coupled connection for improved fatigue resistance
Inventors:
Richard W. DeLange, M. Edward Evans
Patented Case
View Patent ↗
Granted: Aug 26, 2003
Filed: Jul 21, 1999
Inventors
Richard W. DeLange
M. Edward Evans
Assignee (at issue)
GRANT PRIDECO, L.P.
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.