Radio telephone set used as portable set and vehicle-mounted set

Details Radio telephone set used as portable set and vehicle-mounted set Radio telephone set used as portable set and vehicle-mounted set

1989-01-30

1990-10-09

Ng, Jin F.

Telephonic communications

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

Including fiber optic link within telephone network

379 61, 455346, 455127, 455 89, H04M 102, H04B 700

Patent

active

049625233

ABSTRACT:
A radio telephone set comprises switch circuitry, a telephone circuit and a battery for portable operation, which battery may be a built-in battery. When the radio telephone set is not mounted on a vehicle, the switch circuitry is not connected to a battery of the vehicle and feeds power from the built-in battery to the telephone circuit. Thus, the radio telephone set can be used as a portable set. When the radio telephone set is mounted on the vehicle, the switch circuitry is connected to the vehicle battery and this connection causes the automatic switching of the power supply to the telephone circuit from the built-in battery to the vehicle battery. Thus, the radio telephone set can be used as a vehicle-mounted, or onboard, set.

REFERENCES:
patent: 4272650 (1981-06-01), Bolgiano et al.
patent: 4418426 (1983-11-01), Singletary
patent: 4458111 (1984-07-01), Sugihara
patent: 4636741 (1987-01-01), Mitzlaff
patent: 4647722 (1987-03-01), Nishida et al.
patent: 4731814 (1988-03-01), Becker et al.
patent: 4736410 (1988-04-01), Nishida et al.

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