Granted Patent
Utility
US 4,307,205 · App. 06/218,880
Polyester polyols
Inventor:
James P. Bershas
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Dec 22, 1980
Inventor
James P. Bershas
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.