Single-line telephone hold circuit

Details Single-line telephone hold circuit Single-line telephone hold circuit

1989-04-07

1990-02-06

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Hold circuit

379387, 379162, 379163, H04M 902

Patent

active

048993816

ABSTRACT:
A pair of interface devices, mounted externally to a pair of residential telephones, can place a temporary hold on the associated telephone line circuit. Each interface device interconnects a standard residential telephone with an associated telephone line circuit. In a two telephone arrangement to place the telephone circuit in a hold condition, the user throws a switch mounted on the interface device, and hangs up the handset (goes on hook). The switch places two indicator lamps across the two-wire line circuit to simulate an off-hook condition. To remove the hold condition, the user merely throws the same switch or the switch associated with one of the other phones in the residence. There is no need to return to the original phone first used to establish the hold.

REFERENCES:
patent: Re29078 (1976-12-01), Tate
patent: 3629514 (1971-12-01), Flamini
patent: 3952169 (1976-04-01), Vincent
patent: 4079212 (1978-03-01), Sasai
patent: 4394544 (1983-07-01), De Leon
patent: 4435622 (1984-03-01), Grantland et al.
patent: 4447674 (1984-05-01), Grantland
patent: 4454385 (1984-06-01), Grantland
patent: 4529843 (1985-07-01), Boeckmann
DEoFONE, "Two-Line Controller with Ringing," Cat. No. 43-380, Radio Shack, A division of Tandy Corporation.

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