Granted Patent
Utility
US 4,239,793 · App. 05/950,442
Gas separation membrane
Inventors:
Junichi Matsuura, Yukio Yamaguchi
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Oct 11, 1978
Inventors
Junichi Matsuura
Yukio Yamaguchi
Assignee (at issue)
Mitsubishi Chemical 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.