Granted Patent
Utility
US 4,352,308 · App. 06/129,151
Method of cutting cast iron with Si.sub.3 N.sub.4 composite cutting tool material
Inventors:
Shyam K. Samanta, Krishnamoorthy Subramanian, Andre Ezis, David Moskowitz
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Mar 10, 1980
Inventors
Shyam K. Samanta
Krishnamoorthy Subramanian
Andre Ezis
David Moskowitz
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.