Multiple line self-contained telephone

Details Multiple line self-contained telephone Multiple line self-contained telephone

1984-08-23

1987-06-30

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

Detail of hold circuitry

379164, 379156, H04M 1900

Patent

active

046776621

ABSTRACT:
A detection circuit is provided for indicating whether a telephone line is in use or is available or is on hold. The simplified circuit can be incorporated within a telephone instrument so that no external circuitry is required.

REFERENCES:
patent: 4004110 (1977-01-01), Whyte
patent: 4160884 (1979-07-01), Bishop
patent: 4220827 (1980-09-01), Burke et al.

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