Granted Patent
Utility
US 4,380,567 · App. 06/307,206
Ethylenic composite film structure
Inventor:
Hiromi Shigemoto
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Sep 30, 1981
Inventor
Hiromi Shigemoto
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.