Granted Patent
Utility
US 4,692,501 · App. 06/761,330
Process for continuous multi-stage polymerization of olefins
Inventors:
Hideo Mineshima, Haruyuki Koda, Ryoichi Yamamoto
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Jul 31, 1985
Inventors
Hideo Mineshima
Haruyuki Koda
Ryoichi 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.