Granted Patent
Utility
US 4,330,229 · App. 06/212,896
Drill bit
Inventor:
Frederic G. Croydon
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Dec 4, 1980
Inventor
Frederic G. Croydon
Assignee (at issue)
Omark Industries, 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.