Granted Patent
Utility
US 5,003,019 · App. 07/162,200
Cyclo-olefinic random copolymer, olefinic random copolymer, and process for producing cyclo-olefinic random copolymers
Inventors:
Naoshi Ishimaru, Toshiyuki Tsutsui, Akinori Toyota, Norio Kashiwa
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: Feb 29, 1988
Inventors
Naoshi Ishimaru
Toshiyuki Tsutsui
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.