Granted Patent
Utility
US 4,894,421 · App. 07/292,539
Low-crystalline propylene random copolymer composition, process for production thereof, and polypropylene composite laminated structure
Inventors:
Mamoru Kioka, Masahiro Sugi, Akinori Toyota, Norio Kashiwa
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Dec 30, 1988
Inventors
Mamoru Kioka
Masahiro Sugi
Akinori Toyota
Norio Kashiwa
Assignee (at issue)
Mitsui Petrochemical Industries, 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.