Granted Patent
Utility
US 4,881,950 · App. 07/104,695
Silicon nitride cutting tool
Inventors:
Deepak G. Bhat, Dhirajlal Shah
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Oct 5, 1987
Inventors
Deepak G. Bhat
Dhirajlal Shah
Assignee (at issue)
GTE Valenite Corporation
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.