Granted Patent
Utility
US 4,265,949 · App. 06/050,132
Multilayer bag structure for packaging
Inventor:
Kazuya Kugimiya
Patented Case
View Patent ↗
Granted: May 5, 1981
Filed: Jun 19, 1979
Inventor
Kazuya Kugimiya
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.