Corded/cordless telephone

Details Corded/cordless telephone Corded/cordless telephone

1984-12-05

1988-06-21

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 63, H04Q 704

Patent

active

047529490

ABSTRACT:
A telephone capable of operation in a cordless or corded mode. The telephone is basically operative in the cordless mode through the provision of electronic transmitting and receiving elements individual to the base unit and the portable handset. The base unit and the handset are provided with conversion switching circuits coupled to be responsive to the connection of a multi-conductor cord between the base unit and the handset to convert the telephone to corded operation. The conversion circuits disable the transmitting and receiving circuits in both the base and handset and permit the telephone signals to be conductively transmitted between the units through the conductors of the cord.

REFERENCES:
patent: 3919491 (1975-11-01), Luce
patent: 3962583 (1976-06-01), Linder
patent: 3969673 (1976-07-01), Nordlof
patent: 4206318 (1980-06-01), Steely
patent: 4535200 (1985-08-01), Himmelbauer
patent: 4560832 (1988-12-01), Bond et al.
patent: 4593155 (1986-06-01), Hawkins
"Detachable Mobile Radio Units For The 800 MHz Land Mobile Radio System", Kobayashi et al., IEEE Venicular Technology Conference 5/84, pp. 6-11.

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