Granted Patent
Utility
US 4,892,792 · App. 07/233,876
A1N coated silicon nitride based cutting tools
Inventors:
Vinod K. Sarin, Charles D'Angelo, III
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Aug 12, 1988
Inventors
Vinod K. Sarin
Charles D'Angelo, III
Assignee (at issue)
GTE Laboratories Incorporated
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.