Granted Patent
Utility
US 4,344,170 · App. 06/080,679
Time division switching circuit with time slot interchange
Inventor:
Takemi Arita
Patented Case
View Patent ↗
Granted: Aug 10, 1982
Filed: Oct 1, 1979
Inventor
Takemi Arita
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.