Granted Patent
Utility
US 4,778,503 · App. 06/584,296
Method and apparatus for preheating glass batch
Inventors:
Mark A. Propster, Charles M. Hohman, Stephen Seng
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Mar 2, 1984
Inventors
Mark A. Propster
Charles M. Hohman
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.