Telephone apparatus

Details Telephone apparatus Telephone apparatus

1988-04-04

1989-07-25

Lev, Robert

Telephonic communications

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

Including fiber optic link within telephone network

455127, 455343, H04M 123

Patent

active

048521477

ABSTRACT:
A telephone apparatus has a telephone set including a wireless handset, a wireless transmitter, a wireless receiver, a signal identifying circuit for discriminating received signals to generate or erase power-on signals, a telephone set power supply circuit having a secondary battery cluster and switch circuits for applying the voltage of the secondary battery cluster to the above-described elements during a predetermined period, a power supply terminal connected to the secondary battery cluster, and a telephone set power supply controlling circuit; a main power supply; a power supply switch; a connection switching circuit for selectively connecting the power supply terminal to the power supply switch or a predetermined load; and a telephone power supply control instructing circuit responsive to the closing of the power supply switch for operating the connection switching circuit to form a connection between the power supply terminal and the predetermined load to transmit a first signal, subsequently operating the connection switching circuit to form a connection between the power supply terminal and the power supply switch to transmit a second signal in response to the opening of the power supply switch.

REFERENCES:
patent: 3962553 (1976-06-01), Linder et al.
patent: 4562307 (1985-12-01), Bursztejn et al.
patent: 4591914 (1986-05-01), Haramada et al.
patent: 4598258 (1986-07-01), Babano
patent: 4600948 (1986-07-01), Dangschat
patent: 4647722 (1987-03-01), Nishida et al.
patent: 4698748 (1987-10-01), Jazswik et al.
patent: 4723304 (1988-02-01), Maeda
patent: 4731814 (1988-03-01), Becker et al.
patent: 4733100 (1988-03-01), Nusairat
patent: 4736410 (1988-04-01), Nishida et al.
patent: 4736461 (1988-04-01), Kawasaki et al.

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