Granted Patent
Utility
US 5,225,503 · App. 07/974,295
Process for preparing cycloolefin random copolymer
Inventors:
Toshihiro Sagane, Hideaki Yamaguchi
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Nov 10, 1992
Inventors
Toshihiro Sagane
Hideaki Yamaguchi
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.