Granted Patent
Utility
US 4,848,984 · App. 06/652,410
Method of making reaction bonded/hot pressed Si.sub.3 N.sub.4 for use as a cutting tool
Inventors:
Andre Ezis, Elaine C. Beckwith
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Sep 20, 1984
Inventors
Andre Ezis
Elaine C. Beckwith
Assignee (at issue)
Ceradyne, Inc.
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.