Granted Patent
Utility
US 4,742,139 · App. 07/006,305
Process for producing olefin polymers or copolymers
Inventors:
Mamoru Kioka, Norio Kashiwa
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Jan 15, 1987
Inventors
Mamoru Kioka
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.