Keyboard decade digital dial

Details Keyboard decade digital dial Keyboard decade digital dial

1979-02-09

1981-05-12

Brigance, Gerald L.

179 90BD, 179 90K, 179 90AN, H04M 1274

Patent

active

042674093

ABSTRACT:
A decade digital telephone dial which is controlled by means of a keyboard is positioned in place of a conventional rotary dial in a standard telephone unit. An electronic circuit is provided for converting the information keyed into the telephone unit by the keyboard to signals for transmittal from the telephone unit to a called party and for storing as well as displaying telephone numbers keyed into the keyboard unit. The circuitry includes a power supply for converting telephone line current to AC and DC voltages useful in operating the telephone unit. A control circuit controls the transmission of line pulses as well as the storing of information for later use if it is desired that the telephone number be retransmitted in coded form without rekeying or dialing the telephone number. A display is provided for displaying the telephone number called to insure the accuracy of the number and to decrease the time involved in placing telephone calls.

REFERENCES:
patent: 3489860 (1970-01-01), Greenman et al.
patent: 3932709 (1976-01-01), Hoff et al.
patent: 3956596 (1976-05-01), Connolly et al.
patent: 3980837 (1976-09-01), Jakobsson
patent: 4008380 (1977-02-01), La Borde
patent: 4032722 (1977-06-01), Connolly et al.
patent: 4039761 (1977-08-01), Nicoud et al.

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