Granted Patent
Utility
US 4,405,350 · App. 06/176,165
Drying and preheating agglomerates containing clay having coarse particle size
Inventor:
Mark A. Propster
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Aug 7, 1980
Inventor
Mark A. Propster
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.