Granted Patent
Utility
US 4,935,475 · App. 07/251,888
Process for producing cycloolefin random copolymer
Inventors:
Kotaroh Kishimura, Hideaki Yamaguchi, Syuji Minami
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Sep 30, 1988
Inventors
Kotaroh Kishimura
Hideaki Yamaguchi
Syuji Minami
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.