Granted Patent
Utility
US 4,705,828 · App. 06/826,591
Polypropylene resin composition and biaxially stretched film thereof
Inventors:
Yoshio Matsumoto, Toshio Fujii, Yoshinao Shinohara, Kiyoshi Fukuda
Patented Case
View Patent ↗
Granted: Nov 10, 1987
Filed: Feb 6, 1986
Inventors
Yoshio Matsumoto
Toshio Fujii
Yoshinao Shinohara
Kiyoshi Fukuda
Assignee (at issue)
Mitsubishi Chemical 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.