Dual mode portable telephone which prevents power being applied

Details Dual mode portable telephone which prevents power being applied Dual mode portable telephone which prevents power being applied

1993-03-19

1995-06-27

Kuntz, Curtis

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

455 332, 455 382, 455 541, 455 89, H04M 1100

Patent

active

054286646

ABSTRACT:
A portable telephone capable of selectively effecting analog communication or digital communication in response an analog signal or a digital signal. Power is prevented from being applied to either of an analog signal processing section and a digital signal processing section which does not join in communication.

REFERENCES:
patent: 5241690 (1993-08-01), Larsson et al.
patent: 5257401 (1993-10-01), Dahlin et al.
patent: 5263079 (1993-01-01), Umemoto
patent: 5267262 (1993-11-01), Wheatley, III
patent: 5276917 (1994-01-01), Vanhanen et al.

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