Electric lamp and discharge devices: systems – With signal – indicator – or alarm
Reexamination Certificate
2005-11-22
2005-11-22
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
C307S010800, C324S418000, C324S556000
Reexamination Certificate
active
06967445
ABSTRACT:
A circuit to monitor electrical continuity through a light bulb when the light bulb is switched off, and to monitor proper functioning of the light bulb when the bulb is switched on. The circuit comprises a LED, a relay and a latching circuit portion, the latching circuit portion configured to remain latched thereby applying power to the bulb and the relay only when the bulb is switched on and lit, and the relay having a pair of normally closed contacts connected to provide an alternative path of minimal resistance to ground for low voltage applied to an incoming side of the LED, and the relay also having a pair of normally open contacts which when closed allow voltage to be applied to the outgoing side of the LED, thereby resulting in the LED lighting when and only when, the light bulb is broken. Most preferably the latching portion of the circuit comprises a silicone controlled rectifier having a trigger circuit portion configured to pulse the gate when a switched light power control line is energized. The switched light power control line is connected to the anode and a coil of the relay, and the cathode is connected to one of the normally closed contacts of the relay and to the light bulb.
REFERENCES:
patent: 3157870 (1964-11-01), Marino et al.
patent: 3437916 (1969-04-01), Mazurkevics
patent: 3829763 (1974-08-01), Morin
patent: 3872384 (1975-03-01), Laass
patent: 3914687 (1975-10-01), Bevins
patent: 3962630 (1976-06-01), Chaffee
patent: 4027236 (1977-05-01), Stewart
patent: 4327352 (1982-04-01), Cerruti
patent: 6359763 (2002-03-01), Edwards
patent: 2002/0149891 (2002-10-01), Neiger et al.
Jewell Dan J.
Jewell Judith D.
Gallinger G. F.
Tran Thuy Vinh
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