Granted Patent
Utility
US 4,739,015 · App. 06/775,368
Process for producing propylene block copolymer
Inventors:
Akinori Toyota, Norio Kashiwa, Haruyuki Koda, Matsunao Maeda
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: Sep 12, 1985
Inventors
Akinori Toyota
Norio Kashiwa
Haruyuki Koda
Matsunao Maeda
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.