Granted Patent
Utility
US 4,478,628 · App. 06/405,658
Method for controlling the level of molten material in a furnace
Inventor:
Charles S. Dunn
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: Aug 5, 1982
Inventor
Charles S. Dunn
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.