Granted Patent
Utility
US 4,290,915 · App. 06/137,638
Solid titanium catalyst composition for production of an olefin polymer or copolymer
Inventors:
Akinori Toyota, Norio Kashiwa
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Apr 7, 1980
Inventors
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.