Granted Patent
Utility
US 5,204,419 · App. 07/231,854
Process for polymerizing olefins
Inventors:
Toshiyuki Tsutsui, Akinori Toyota, Norio Kashiwa
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Aug 11, 1988
Inventors
Toshiyuki Tsutsui
Akinori Toyota
Norio Kashiwa
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.