Granted Patent
Utility
US 4,312,657 · App. 06/206,809
Method of and apparatus for sensing the level of molten glass in a glass melting furnace
Inventors:
Sheldon A. Canfield, Paul S. Sanik
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Nov 14, 1980
Inventors
Sheldon A. Canfield
Paul S. Sanik
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.