Granted Patent
Utility
US 4,420,524 · App. 06/426,295
Bitumen, atactic polypropylene and propylene/ethylene copolymer compositions and water-proofing membranes using the same
Inventor:
Romolo Gorgati
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Sep 29, 1982
Inventor
Romolo Gorgati
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.