Granted Patent
Utility
US 4,574,104 · App. 06/662,774
Multi-layer film
Inventors:
Takanori Aishima, Makoto Utsumi, Yoshihiro Ezaki
Patented Case
View Patent ↗
Granted: Mar 4, 1986
Filed: Oct 19, 1984
Inventors
Takanori Aishima
Makoto Utsumi
Yoshihiro Ezaki
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.