Granted Patent
Utility
US 5,788,401 · App. 08/772,860
Rod joint
Inventor:
Christopher L. Drenth
Patented Case
View Patent ↗
Granted: Aug 4, 1998
Filed: Dec 24, 1996
Inventor
Christopher L. Drenth
Assignee (at issue)
Boart Longyear International Holdings, 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.