Granted Patent
Utility
US 4,189,420 · App. 05/928,965
Polyolefin resin composition and method for making polyolefin film
Inventors:
Masaaki Sugimoto, Yoshio Matsumoto, Nobushige Ikeya, Koichi Hasegawa
Patented Case
View Patent ↗
Granted: Feb 19, 1980
Filed: Jul 28, 1978
Inventors
Masaaki Sugimoto
Yoshio Matsumoto
Nobushige Ikeya
Koichi Hasegawa
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.