Granted Patent
Utility
US 4,474,745 · App. 06/397,665
Production of spinel powder
Inventor:
George W. Ritter, II
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Jul 12, 1982
Inventor
George W. Ritter, II
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.