Granted Patent
Utility
US 5,272,235 · App. 07/665,478
Cycloolefin random copolymer and process for preparing same
Inventors:
Kenji Wakatsuru, Takehiko Kawate, Shigemi Shiraki, Toshihiro Sagane, Shuji Minami, Masayuki Okabe, Ryosuke Tomita, Hideaki Yamaguchi
Patented Case
View Patent ↗
Granted: Dec 21, 1993
Filed: Mar 6, 1991
Inventors
Kenji Wakatsuru
Takehiko Kawate
Shigemi Shiraki
Toshihiro Sagane
Shuji Minami
Masayuki Okabe
Ryosuke Tomita
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.