Granted Patent
Utility
US 4,582,521 · App. 06/619,519
Melting furnace and method of use
Inventor:
Magnus L. Froberg
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Jun 11, 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.