Granted Patent
Utility
US 5,145,818 · App. 07/631,428
Olefin polymerization catalyst and process for the polymerization of olefins
Inventors:
Toshiyuki Tsutsui, Kenji Sugimura, Takashi Ueda
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Dec 21, 1990
Inventors
Toshiyuki Tsutsui
Kenji Sugimura
Takashi Ueda
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.