Granted Patent
Utility
US 4,454,205 · App. 06/310,226
Method of drill bit manufacture and product
Inventors:
Ronald R. Miller, William R. Barber, Jr., David A. Hampel, James Ault
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Oct 9, 1981
Inventors
Ronald R. Miller
William R. Barber, Jr.
David A. Hampel
James Ault
Assignee (at issue)
ESCO GROUP 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.