Series wired light string with unidirectional resistive shunts

Details Series wired light string with unidirectional resistive shunts Series wired light string with unidirectional resistive shunts

2008-03-04

2008-03-04

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Plural series connected load devices

Christmas lights

C315S122000, C315S18500S, C315S291000

Reexamination Certificate

active

07339325

ABSTRACT:
A string set of series-connected incandescent bulbs in which substantially all of the bulb filaments in the set are individually provided with a shunt circuit which includes a voltage responsive switch which is inoperative during normal operation of the string set when connected to a source of operating potential and which becomes operative only in response to an increase in the voltage thereacross which exceeds its rating, and in which the remaining bulbs of the circuit continue to receive substantially rated current therethrough and substantially rated voltage thereacross and further continue to be illuminated at substantially constant illumination even though other or substantially all of the other bulbs in the string are either inoperative or are missing from their respective sockets. The voltage responsive switches may be in series with a resistor.

REFERENCES:
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patent: 4450382 (1984-05-01), Sawka et al.
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patent: 5006724 (1991-04-01), Liu
patent: RE34717 (1994-09-01), Sanders et al.
patent: 5379214 (1995-01-01), Arbuckle et al.
patent: 5539317 (1996-07-01), Janning
patent: 6580182 (2003-06-01), Janning
patent: 7086758 (2006-08-01), Janning
patent: 2002/0043943 (2002-04-01), Menzer et al.
patent: 427021 (1965-06-01), None
patent: 884370 (1943-11-01), None

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