Granted Patent
Utility
US 4,992,511 · App. 07/413,695
Cyclo-olefinic random copolymer composition and reaction product thereof
Inventors:
Yohzoh Yamamoto, Satoru Moriya
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Sep 28, 1989
Inventors
Yohzoh Yamamoto
Satoru Moriya
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.