Granted Patent
Utility
US 4,638,490 · App. 06/658,018
Melting furnaces
Inventors:
Charles S. Dunn, Mark A. Propster, Charles M. Hohman
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Oct 5, 1984
Inventors
Charles S. Dunn
Mark A. Propster
Charles M. Hohman
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.