Portable telephone apparatus having built-in option circuit

Details Portable telephone apparatus having built-in option circuit Portable telephone apparatus having built-in option circuit

1996-06-06

1998-11-03

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455564, H04Q 732

Patent

active

058323910

ABSTRACT:
In a portable telephone apparatus selectively operable in a portable mode or in an on-board mode, an option circuit is built in a chargeable battery pack for adding an extra function to a telephone. A plurality of keys are arranged on the telephone and operable to cause the telephone and option circuit to interchange speech signals and control signals and to start and stop operating.

REFERENCES:
patent: 4887311 (1989-12-01), Garner et al.
patent: 5020094 (1991-05-01), Rash et al.
patent: 5136229 (1992-08-01), Galvin
patent: 5287554 (1994-02-01), Furuno
patent: 5465401 (1995-11-01), Thompson
European Search Report.

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