Automatic release device for automatically releasing the hold-on

Details Automatic release device for automatically releasing the hold-on Automatic release device for automatically releasing the hold-on

1993-03-25

1996-03-05

Hofsass, Jeffery A.

Telephonic communications

Substation or terminal circuitry

Hold circuit

379387, 379162, 379212, H04M 320

Patent

active

054974151

ABSTRACT:
An automatic release device for automatically releasing hold-on setting of an outside line call wherein a first telephone when having an outside line call from a second telephone and set to the hold-on state can be released from the hold-on setting by use of a sensing means detecting signals based on the hook-down at the second telephone slde. Further a transfer method for an outside line call, by using a conference call system served by Telegraph and Telephone Corporations wherein a running outside line call received from a second telephone by a first telephone through outside line wire is set to enable the conference call and the first telephone is set to the hold-on state so as to allow persons at the second and third telephones to talk with each other, wherein a sensing means for detecting signals based on hook-down of either of the second and third telephones is used to release the first telephone from the hold-on state.

REFERENCES:
patent: 4232198 (1980-11-01), Warman
patent: 4551582 (1985-11-01), Matsuo
patent: 4656625 (1987-04-01), Nojiri
patent: 4674118 (1987-06-01), Tosto
patent: 4852158 (1989-08-01), Tsurusaki et al.
patent: 4870680 (1989-09-01), Ohtsuka et al.

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