Granted Patent
Utility
US 5,028,671 · App. 07/430,081
Process for polymerization of olefins and polymerization catalyst
Inventors:
Mamoru Kioka, Norio Kashiwa
Patented Case
View Patent ↗
Granted: Jul 2, 1991
Filed: Nov 1, 1989
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.