Granted Patent
Utility
US 4,282,019 · App. 06/149,097
Glass manufacturing process with in-situ colemanite calcination and pollution abatement features
Inventors:
Charles S. Dunn, Mark A. Propster
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: May 12, 1980
Inventors
Charles S. Dunn
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.