Granted Patent
Utility
US 4,442,276 · App. 06/348,176
Process for polymerizing or copolymerizing olefins
Inventors:
Norio Kashiwa, Yoshihisa Ushida
Patented Case
View Patent ↗
Granted: Apr 10, 1984
Filed: Feb 12, 1982
Inventors
Norio Kashiwa
Yoshihisa Ushida
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.