Granted Patent
Utility
US 4,885,890 · App. 07/268,110
Modular furnace lining and hardware system therefor
Inventor:
Gary W. Deren
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Nov 7, 1988
Inventor
Gary W. Deren
Assignee (at issue)
Stemcor Corporation
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.