US PATENT SUBCLASS 315 / 137
POLYPHASE A.C. SUPPLY

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

137POLYPHASE A.C. SUPPLY {4}
138  DF  .~> M phase to N phase (e.g., phase splitters) {1}
141  DF  .~> Transformer in the supply circuit {4}
146  DF  .~> Plural discharge control discharge device load devices
147  DF  .~> Plural cathode and/or anode discharge device load {1}

DEFINITION

Classification: 315/137

(under the class definition) Systems provided with (1) means for supplying electrical energy from a source of polyphase alternating currents to one or more load devices, or (2) a source of polyphase alternating current and means for converting the polyphase alternating currents to current of

another character which is supplied to one or more load devices.

(1) Note. In the systems of (1) above, the source of current may be either a direct or single phase alternating current, the system including means to convert the current to polyphase alternating currents which are supplied to one or more load devices.

(2) Note. In the system of (2) above, the polyphase alternating currents may be converted to either single phase alternating current or direct current which is supplied to one or more devices.

(3) 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: 160, and indented subclasses, for systems provided with a plurality of sources of current supply, not especially indented subclass 174, for such systems having a plurality of alternating current supplies of diverse types.

194, and indented subclasses, for systems wherein the discharge device is provided with discharge controlling means, such as a grid electrode, and the discharge control circuit includes means to shift the phase of the control current or potential with respect to the pulsating and alternating current in the cathode-anode circuit of the discharge device. In the systems of subclass 194 and indented subclasses, the source of supply current for the load device need not be a pulsating or alternating current. Where the source of supply current is pulsating or alternating, and the control means is claimed as an auxiliary starting electrode, the patent is classified in this subclass (137) or the indented subclasses and cross-referenced to subclass 194 and indented subclasses. Where the claims only recite a control device even though an auxiliary starting

electrode is disclosed, the patent is classified in subclass 194 and indented subclasses.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

13+, for polyphase circuits of general application.

314, Electric Lamp and Discharge Devices: Consumable Electrodes,

31, for consumable electrode discharge devices in combination with means for supplying polyphase alternating currents to the discharge device.

323, Electricity: Power Supply or Regulation Systems, appropriate subclasses, for polyphase alternating current systems having a single input and a single output circuit and provided with means for controlling the voltage and/or current and/or phase of the polyphase alternating current.

363, Electric Power Conversion Systems, appropriate subclasses for conversion systems which are supplied with polyphase alternating currents, particularly

1+, for combined or plural conversions systems; subclasses 13+ for current conversion (e.g., rectification, decertification) systems; subclasses 148+ for systems for converting an input alternating current having one number of phases into alternating current having a different number of phases; and subclasses 157+ for frequency conversion systems which may be supplied with polyphase alternating current.