Circuit device for controlling the actuated state of an electric

Details Circuit device for controlling the actuated state of an electric Circuit device for controlling the actuated state of an electric

1988-09-27

1990-04-17

NG, Jin F.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379396, H04M 100

Patent

active

049187201

ABSTRACT:
The invention discloses a control circuit device of a desk lamp apparatus which is used in association with a telephone set. This circuit device may be actuated by an input signal from a telephone line for the duration of a call in order to provide a full light source over the place surrounding the telephone. A delay circuit is provided to prolong the actuated state of the circuit device for a period of time after a phone conversation is over.

REFERENCES:
patent: 3412213 (1968-11-01), McCay
patent: 4140884 (1979-02-01), Ouimet et al.
patent: 4467144 (1984-08-01), Wilkerson et al.
patent: 4747133 (1988-05-01), Valenzona et al.
patent: 4821314 (1989-04-01), Guyader et al.

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