Granted Patent
Utility
US 5,209,885 · App. 07/724,558
Aqueous extrusion of silicon nitride
Inventors:
Tariq Quadir, Ahmad Arfaei
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Jun 28, 1991
Inventors
Tariq Quadir
Ahmad Arfaei
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.