Granted Patent
Utility
US 4,330,313 · App. 06/209,787
Preheat hopper agitators
Inventors:
Charles M. Hohman, Mark A. Propster, Stephen Seng
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Nov 24, 1980
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.