Granted Patent
Utility
US 4,828,640 · App. 07/197,964
Method of producing films using a peeling jig
Inventors:
Toshio Kaya, Makoto Fujimoto, Hiroaki Nakagawa
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: May 24, 1988
Inventors
Toshio Kaya
Makoto Fujimoto
Hiroaki Nakagawa
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.