Granted Patent
Utility
US 5,120,685 · App. 07/629,754
Sintered silicon nitride
Inventors:
Tariq Quadir, Roy W. Rice
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Dec 18, 1990
Inventors
Tariq Quadir
Roy W. Rice
Assignee (at issue)
W.R. Grace & Co. Conn.
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.