Dialing apparatus for a portable radio telephone

Details Dialing apparatus for a portable radio telephone Dialing apparatus for a portable radio telephone

1974-12-03

1976-07-20

Olms, Douglas W.

179 84VF, H04M 150

Patent

active

039708012

ABSTRACT:
This apparatus is especially useful as a conversion kit and includes a new front cover for a portable radio telephone having a plurality of push buttons mounted therein, which push buttons activate a tone generator, the tones from which are applied to a timer and through a multi-contact relay to the speaker and transmitter of the radio telephone. The timer is utilized to activate the relay for 90 milliseconds each time a tone is produced by the tone generator so that a tone is transmitted for only 90 milliseconds and when a tone is not being generated the transmitter is connected to a microphone and the speaker is connected to the receiver in the normal operating manner by the relay.

REFERENCES:
patent: 2986603 (1961-05-01), Meacham
patent: 3064084 (1962-11-01), Meacham
patent: 3087999 (1963-04-01), Stewart et al.
patent: 3284577 (1966-11-01), Burns et al.
patent: 3345466 (1967-10-01), Rahmig
patent: 3784759 (1974-01-01), Haight et al.
patent: 3824465 (1974-07-01), Blough

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