Granted Patent
Utility
US 4,897,561 · App. 07/228,579
Apparatus for and method of discriminating signals
Inventors:
Akira Saigo, Shigenari Maezawa, Tomoaki Kageyama, Keizaburo Ishikura, Akio Sera, Junji Suehiro
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Aug 5, 1988
Inventors
Akira Saigo
Shigenari Maezawa
Tomoaki Kageyama
Keizaburo Ishikura
Akio Sera
Junji Suehiro
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.