Granted Patent
Utility
US 4,282,018 · App. 06/137,684
Glass manufacturing process with in-situ colemanite calcination
Inventor:
Magnus L. Froberg
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Apr 7, 1980
Inventor
Magnus L. Froberg
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.