Line use indicator in a telephone set

Details Line use indicator in a telephone set Line use indicator in a telephone set

1987-03-12

1988-02-02

Schreyer, Stafford D.

Telephonic communications

Substation or terminal circuitry

Visual signalling

H04M 172

Patent

active

047232790

ABSTRACT:
A line use indicator in a telephone set, to indicate a telephone line is in use when a plurality of telephone sets are paralleled on the line, comprises a light emitting device switched by a transistor, the transistor controlled by a VMOS FET. The transistor may switch a separate power source or a self-contained power source from the telephone line.

REFERENCES:
patent: 4653094 (1987-03-01), Rasmussen et al.

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