Granted Patent
Utility
US 5,234,878 · App. 07/653,943
Olefin polymerization solid catalysts and process for the polymerization of olefins
Inventors:
Toshiyuki Tsutsui, Takashi Ueda
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Feb 12, 1991
Inventors
Toshiyuki Tsutsui
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.