Granted Patent
Utility
US 4,242,538 · App. 06/018,368
Radio channel control systems of mobile radio telephone systems
Inventors:
Sadao Ito, Noriaki Yoshikawa, Mitsuru Komura
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Mar 7, 1979
Inventors
Sadao Ito
Noriaki Yoshikawa
Mitsuru Komura
Assignee (at issue)
Nippon Telegraph and Telephone Public Corporation
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.