US PATENT SUBCLASS 315 / 250
.~ Plural load device systems

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

246  DF  PULSATING OR A.C. SUPPLY {10}
250.~ Plural load device systems {5}
251  DF  .~.~> Inverse parallel connected asymmetrical discharge device loads
252  DF  .~.~> Discharge control discharge device loads
253  DF  .~.~> Full wave systems with asymmetrical discharge device loads
254  DF  .~.~> Transformer in the supply circuit {2}
258  DF  .~.~> Inductance in the supply circuit {1}

DEFINITION

Classification: 315/250

(under subclass 246) Systems having two or more load devices in the system.

(1) Note. Where a single lamp or a single discharge device is the ultimate load device, and the system includes an additional lamp and/or discharge device in the circuit which is connected in the circuit so as to control and/or modify

the current and/or potential supplied to such single ultimate load device, the patent is classified as a plural load device system, if (a) the controlling and/or modifying device is a lamp, or (b) the controlling and/or modifying device is limited in the claims to being a gas or vapor discharge device. Conversely, such a system is not classified as a plural load device system where the controlling and/or modifying device is claimed broadly as a discharge device even though it is disclosed as a gas or vapor discharge device.

The controlling and/or modifying device may be connected in the control circuit of the discharge device where the ultimate load device is a discharge control discharge device, and the same basis of classification is used as is set forth above.

SEE OR SEARCH THIS CLASS, SUBCLASS:

97, for systems provided with a plurality of load devices, the load devices having thermionic cathodes heated by the passage of electric current or indirectly heated cathodes, the cathode or cathode heater circuits being supplied with pulsating or alternating current.

137+, for this subject matter where the source of supply for the load devices is polyphase alternating current. 177, for this subject matter where there is a transformer in the supply circuit, a load device being connected in the primary circuit of the transformer and another load device being connected in the secondary circuit of the transformer.

186, for systems which include a plurality of series connected load devices, the supply circuit including a periodic switch to periodically interrupt the supply of current to at least one of the load devices.

195, for this subject matter where the load devices are discharge control discharge device load devices, and the system includes means to shift the phase of the current and/or potential supplied to the control means with respect to the current in the anode-cathode circuit.

201, for plural load device systems wherein the source of supply is a source of alternating or pulsating current, and a rectifier and/or an electric space discharge device is connected in the supply circuit of at least one of the load devices.

228, and indented subclasses, for plural load device systems wherein a condenser is included in the circuit of at least one of the load devices so that the load device is periodically energized by the current discharged from the condenser.