Granted Patent
Utility
US 4,264,550 · App. 06/105,828
Method of making silicon nitride base cutting tools -II
Inventor:
Andre Ezis
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Dec 20, 1979
Inventor
Andre Ezis
Assignee (at issue)
Ford Motor Company
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.