Granted Patent
Utility
US 4,328,020 · App. 06/209,631
Melting glass with reduced NO.sub.x emissions
Inventor:
David E. Hughes
Patented Case
View Patent ↗
Granted: May 4, 1982
Filed: Nov 24, 1980
Inventor
David E. Hughes
Assignee (at issue)
PPG Industries, Inc.
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.