Granted Patent
Utility
US 4,796,276 · App. 06/621,639
Melting furnace
Inventor:
Magnus L. Froberg
Patented Case
View Patent ↗
Granted: Jan 3, 1989
Filed: Jun 18, 1984
Inventor
Magnus L. Froberg
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.