Granted Patent
Utility
US 6,406,070 · App. 09/706,204
Casing drilling connector with low stress flex groove
Inventors:
Richard W. DeLange, Ed Evans, Richard Griffin
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Nov 3, 2000
Inventors
Richard W. DeLange
Ed Evans
Richard Griffin
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.