Granted Patent
Utility
US 4,347,408 · App. 06/097,697
Multi-frequency signal receiver
Inventors:
Hiroko Ito, Eiji Ohira, Akira Ichikawa
Patented Case
View Patent ↗
Granted: Aug 31, 1982
Filed: Nov 27, 1979
Inventors
Hiroko Ito
Eiji Ohira
Akira Ichikawa
Assignees (at issue)
Nippon Telegraph and Telephone Public Corporation
HITACHI, 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.