Granted Patent
Utility
US 3,989,881 · App. 05/565,196
Catalyst and process for polymerization of olefin
Inventors:
Kazuo Yamaguchi, Natsuki Kanoh, Toru Tanaka, Nobuo Enokido, Atsushi Murakami, Seiji Yoshida
Patented Case
View Patent ↗
Granted: Nov 2, 1976
Filed: Apr 4, 1975
Inventors
Kazuo Yamaguchi
Natsuki Kanoh
Toru Tanaka
Nobuo Enokido
Atsushi Murakami
Seiji Yoshida
Assignee (at issue)
Mitsubishi Chemical 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.