Mobile telephone terminal having function to perform call clear

Details Mobile telephone terminal having function to perform call clear Mobile telephone terminal having function to perform call clear

1989-04-20

1990-03-13

Lev, Robert

Telephonic communications

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

Including fiber optic link within telephone network

379 61, 379 63, 455127, H04Q 701

Patent

active

049088467

ABSTRACT:
A mobile telephone terminal includes a portable-unit and an adaptor which is capable of mounting the portable-unit on a vehicle and supplying power from a vehicle battery to the portable-unit. The adapter includes a power switch manually generating a switch signal and a delay circuit which delays the switch signal by a predetermined period of time when the telephone terminal is in a communication state and the power switch is depressed in place of a call end key. In response to the delayed switch signal, a transistor switch circuit stops power supply from the vehicle battery to the portable-unit. The portable-unit initiates a call clear process in response to the switch signal and during the predetermined period of time performs and completes the call clear process. In the call clear process, the portable-unit transmits a call clear signal to a base station over a radio channel used and turns off its radio frequency station. The call clear process makes the used radio channel available for other parties immediately after the call finishes.

REFERENCES:
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patent: 4591914 (1986-05-01), Hakamada et al.
patent: 4612667 (1986-09-01), Hansen
patent: 4631736 (1986-12-01), Yamanoue et al.
patent: 4691338 (1987-09-01), Makino
patent: 4698748 (1987-10-01), Juzswik et al.

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