Granted Patent
Utility
US 4,797,177 · App. 07/151,204
Method of cutting an organic membrane
Inventors:
Toshio Kaya, Makoto Fujimoto
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Feb 1, 1988
Inventors
Toshio Kaya
Makoto Fujimoto
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.