Granted Patent
Utility
US 5,128,446 · App. 07/403,459
Process for producing cycloolefin random copolymer
Inventors:
Takashi Hayashi, Shunyo Uesugi, Hiroo Wamura
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: Sep 6, 1989
Inventors
Takashi Hayashi
Shunyo Uesugi
Hiroo Wamura
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.