Granted Patent
Utility
US 5,115,052 · App. 07/670,485
Process for producing cycloolefin random copolymers
Inventors:
Hiroo Wamura, Shunyo Uesugi, Takashi Hayashi
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Mar 13, 1991
Inventors
Hiroo Wamura
Shunyo Uesugi
Takashi Hayashi
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.