Portable wireless telephone apparatus with use specific power mo

Details Portable wireless telephone apparatus with use specific power mo Portable wireless telephone apparatus with use specific power mo

1992-09-17

1995-02-21

Kuntz, Curtis

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455127, 455343, 379 59, 379 61, H04B 140, H04M 1100

Patent

active

053924622

ABSTRACT:
In a portable wireless telephone capable of providing a cellular mode which allows users to place or receive telephone calls through a cellular telephone network and a cordless mode which allows the users to place or receive telephone calls through an associated base unit of a cordless telephone, a battery voltage is monitored to check whether or not the battery voltage is so lowered that the cellular mode becomes inoperative. An LCD unit displays a low-voltage warning if the battery voltage is lowered down to such a low level. However, a micro computer equipped in this portable wireless telephone allows the users to use this portable wireless telephone as a cordless telephone. Accordingly, this portable wireless telephone can be still activated in the cordless mode even if it cannot be no longer used as a cellular telephone.

REFERENCES:
patent: 4989230 (1991-01-01), Gillig et al.
patent: 5117449 (1992-05-01), Metroka et al.
patent: 5127042 (1992-06-01), Gillig et al.

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