Granted Patent
Utility
US 4,386,951 · App. 06/330,064
Method and apparatus for preheating glass batch
Inventors:
Charles M. Hohman, Mark A. Propster, Stephen Seng
Patented Case
View Patent ↗
Granted: Jun 7, 1983
Filed: Dec 14, 1981
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.