Granted Patent
Utility
US 5,455,316 · App. 08/197,975
Olefin polymerization solid catalyst, olefin polymerization catalyst and olefin polymerization
Inventors:
Toshiyuki Tsutsui, Ken Yoshitsugu, Kunio Yamamoto
Patented Case
View Patent ↗
Granted: Oct 3, 1995
Filed: Feb 17, 1994
Inventors
Toshiyuki Tsutsui
Ken Yoshitsugu
Kunio Yamamoto
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.