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| Number | Title | Issue Date |
| 4420832 | Concentrator-deconcentrator devices Concentrator-deconcentrator devices for time-division telephone systems, based on the use of symmetrical time-division arrays arranged in terminal modules comprising subscriber and line connecting units to be served and in central modules which provide th... | 12/13/1983 |
| 4338604 | Pulsed coherent doppler radar with frequency agility A pulse coherent Doppler radar allows both transmission frequency agility and pulse repetition frequency agility in association with phase encoding which accomplishes the transmission frequency agility by the use of a transmission oscillator, the nominal ... | 07/06/1982 |
| 4317008 | Modular time-division switching network The modular switching network for time-division telephone exchanges, which may be applied to small-capacity time-division telephone exchanges, is constituted by the direct connection of pairs of subscriber and trunk line connecting units by PCM digital tr... | 02/23/1982 |
| 4306118 | Telephone set ringing current injection device A telephone set line circuit ringing current injection device having a hybrid circuit in which each feed wire is connected in series with a resistor, and a stage consisting of a diode connected in parallel with the collector-to-emitter circuit of a transi... | 12/15/1981 |
