Granted Patent
Utility
US 4,253,532 · App. 06/067,882
In-hole motor drill with locking bit clutch
Inventor:
Bela Geczy
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Aug 20, 1979
Inventor
Bela Geczy
Assignee (at issue)
SMITH INTERNATIONAL, 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.