Title: Dialing apparatus for a portable radio telephone

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.

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Inventors: Ross, Danny E. (Plantation, FL, US)
Mueller, James M. (Margate, FL, US)

Application Number: 529020
Filing Date: 1974-12-03
Publication_date: 1976-07-20
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Class(es): 455/564 379/361
Other Classes:
US Patent Ref:

2986603	May, 1961	Meacham	179/17.
3064084	Nov, 1962	Meacham	179/84.
3087999	Apr, 1963	Stewart et al.	179/84.
3284577	Nov, 1966	Burns et al.	179/84.
3345466	Oct, 1967	Rahmig	179/84.
3784759	Jan, 1974	Haight et al.	179/84.
3824465	Jul, 1974	Blough	325/16.

Other Refs:
Primary Examiner: Olms, Douglas W.
Assistant Examiner:
Attorney: Gillman; James W., Parsons; Eugene A.