Granted Patent
Utility
US 5,486,561 · App. 08/049,302
Polypropylene resin composition
Inventors:
Koki Hirano, Ryuichi Ohki, Yutaka Kobayashi
Patented Case
View Patent ↗
Granted: Jan 23, 1996
Filed: Apr 21, 1993
Inventors
Koki Hirano
Ryuichi Ohki
Yutaka Kobayashi
Assignee (at issue)
Idemitsu Petrochemical Co., 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.