Granted Patent
Utility
US 4,150,258 · App. 05/878,594
Electronic switching system
Inventors:
Shigefumi Fujimoto, Yasunobu Suzuki, Hiromasa Ikeda, Nobuyoshi Akiyama
Patented Case
View Patent ↗
Granted: Apr 17, 1979
Filed: Feb 16, 1978
Inventors
Shigefumi Fujimoto
Yasunobu Suzuki
Hiromasa Ikeda
Nobuyoshi Akiyama
Assignees (at issue)
OKI ELECTRIC INDUSTRY CO., LTD.
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.