Granted Patent
Utility
US 4,401,453 · App. 06/373,465
Preheating glass batch
Inventors:
Mark A. Propster, Stephen Seng, Charles M. Hohman
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Apr 30, 1982
Inventors
Mark A. Propster
Stephen Seng
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.