Granted Patent
Utility
US 4,236,764 · App. 06/006,706
Earth boring drill bit with snap ring cutter retention
Inventor:
Edward M. Galle
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Jan 26, 1979
Inventor
Edward M. Galle
Assignee (at issue)
Hughes Tool Company LLC
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.