Granted Patent
Utility
US 4,582,696 · App. 06/723,605
Method of making a special purity silicon nitride powder
Inventor:
Gary M. Crosbie
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Apr 15, 1985
Inventor
Gary M. Crosbie
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.