Granted Patent
Utility
US 5,204,037 · App. 07/816,349
Process for production of polypropylene sheets or films
Inventor:
Atsushi Fujii
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Dec 30, 1991
Inventor
Atsushi Fujii
Assignee (at issue)
Idemitsu Petrochemical Co., Ltd.
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.