Granted Patent
Utility
US 4,425,147 · App. 06/492,311
Preheating glass batch
Inventors:
Charles M. Hohman, Mark A. Propster, Stephen Seng
Patented Case
View Patent ↗
Granted: Jan 10, 1984
Filed: May 6, 1983
Inventors
Charles M. Hohman
Mark A. Propster
Stephen Seng
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.