Granted Patent
Utility
US 4,397,036 · App. 06/035,538
Diversity system
Inventors:
Kenkichi Hirade, Takeshi Hattori, Fumiyuki Adachi
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: May 3, 1979
Inventors
Kenkichi Hirade
Takeshi Hattori
Fumiyuki Adachi
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.