US PATENT SUBCLASS 315 / 65
.~.~ Automatic substitution of the filament


Current as of: June, 1999
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315 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS

32  DF  COMBINED LOAD DEVICE OR LOAD DEVICE TEMPERATURE MODIFYING MEANS AND ELECTRICAL CIRCUIT DEVICE STRUCTURE {19}
64  DF  .~ Multiple filament load devices {5}
65.~.~ Automatic substitution of the filament


DEFINITION

Classification: 315/65

(under subclass 64) Multiple filament load devices, provided with means for maintaining one of the filaments in nonoperating connection with respect to the current supply circuit while another of the filaments is maintained in operative relation with respect to the supply circuit, means being provided which operate automatically (1) in response to either the failure of the operatively connected filament to operate properly or its failure to operate at all, or (2) when excessive voltage or current conditions prevail which would tend to damage the operating filament, to connect the nonoperating filament in operative relation to the supply circuit and to disconnect the operating filament from the supply circuit whereby one filament is substituted for the other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

87, and 88, and indented subclasses for other systems under the class definition for automatically substituting one electrode or load device for another when the first operated electrode or load device fails or is subjected to excessive current or voltage.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices,

236, for electric lamps and discharge devices which have a plurality of similar electrodes and which are provided with means so that one electrode can be used to the exclusion of another, and the excluded electrode can be substituted for the first operated electrode when such electrode becomes defective.