Manual of U.S. Patent Classification
as of June 30, 2000

Class
323
ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

Patents classified in a subclass may be accessed by clicking on the " " icon following the subclass number, below.

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For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS
201		INCLUDING A DYNAMOELECTRIC MACHINE
202		. Balancer sets
203		. With plural sets of slip rings or brushes
204		. Condition responsive
205		FOR REACTIVE POWER CONTROL
206		. Using saturable inductor
207		. Using converter
208		. Using impedance
209		. . Switched impedance
210		. . . Static switch
211		. . . . Digitally controlled
212		FOR PHASE SHIFT OR CONTROL
213		. By splitting and combining
214		. Using saturable inductor
215		. Using transformer
216		. . With movable structure or winding
217		. Using a three or more terminal semiconductive device
218		. Using impedance
219		. . In bridge
220		IN SHUNT WITH SOURCE OR LOAD
221		. Photo responsive
222		. Using choke and switch across source
223		. Using a three or more terminal semiconductive device
224		. . With additional series regulator
225		. . Plural devices
226		. . Linearly acting
227		. Using electronic tube
228		. . With additional series regulator
229		. Using diode
230		. . Inverse parallel
231		. . Zener
232		. Using inductor
233		. Using impedance
234		OUTPUT LEVEL RESPONSIVE
235		. Zero switching
236		. . Nonelectrical condition sensing
237		. Phase controlled switching using electronic tube or a three or more terminal semiconductive device
238		. . With soft start
239		. . Including single unidirectional element with bidirectional pass
240		. . Including saturable inductor in trigger circuit
241		. . With digital control
242		. . Including ramp generator or controlled capacitor charging
243		. . . As input to comparator
244		. . With synchronization
245		. . With nonelectrical condition sensing
246		. . With plural condition sensing
247		. Using a transformer or inductor as the final control device
248		. . Ferroresonant
249		. . Controllably saturable
250		. . . With specific core structure (e.g., gap, aperture, slot, permanent magnet)
251		. . . With plural power windings
252		. . . . In bridge configuration or in bridge arm
253		. . . . On different cores
254		. . . With electronic tube or a three or more terminal semiconductive device in control circuit
255		. . Having a variable length winding (e.g., tapped) as the final control device
256		. . . With motor driven tap switch
257		. . . . Including an electronic tube or a three or more terminal semiconductive device in control circuit
258		. . . With electronic tube or a three or more terminal semiconductive device as tap switch
259		. . Having a winding in series with the source and load (e.g., buck-boost)
260		. . . With motor in control circuit
261		. . . With saturable reactor in control circuit
262		. . . Plural windngs in series
263		. . . With electronic tube or a three or more terminal semiconductive device in control circuit
264		. . Having movable structure or winding
265		. Using a three or more terminal semiconductive device as the final control device
266		. . Including pre or post regulation
267		. . Including plural loads commonly controlled
268		. . Including plural final control devices
269		. . . Linearly acting parallel connected
270		. . . Linearly acting series connected
271		. . . Switched (e.g., on-off control)
272		. . . . Parallel connected
273		. . Linearly acting
274		. . . With threshold detection
275		. . . With plural condition sensing
276		. . . . For protective system
277		. . . . . With current sensor
278		. . . . . . Having base-emitter of transistor coupled across sensor
279		. . . . Including final control device parameter
280		. . . With a specific feedback amplifier (e.g., integrator, summer)
281		. . . With reference voltage circuitry
282		. . Switched (e.g., switching regulators)
283		. . . Digitally controlled
284		. . . With threshold detection
285		. . . With plural condition sensing
286		. . . . Including filter sensing
287		. . . . . In flyback path
288		. . . With ramp generator or controlled capacitor charging
289		. . . With base drive control dissipation
290		. . . With inductor in control circuit
291		. Using an electronic tube as the final control device
292		. . With a three or more terminal semiconductive device in control circuit
293		. Using an impedance as the final control device
294		. . Hall effect device, magnetoresistor or thermistor
295		. . Pressure sensitive resistor
296		. . Liquid contact resistor
297		. . Plural selective resistors
298		. . Variable resistor
299		INPUT LEVEL RESPONSIVE
300		. Phase controlled switching using electronic tube or a three or more terminal semiconductive device
301		. Using a transformer or inductor as the final control device
302		. . Saturable
303		. Using a linearly acting final control device
304		SELF-REGULATING (E.G., NONRETROACTIVE)
305		. Using a transformer or inductor as the final control device
306		. . Ferroresonant
307		. . . With plural cores
308		. . . With core having an air gap or magnetic shunt
309		. . . . Including a ferrocapacitor across a tertiary winding
310		. . Controllably saturable
311		. Using a three or more terminal semiconductive device as the final control device
312		. . For current stabilization
313		. . . To derive a voltage reference (e.g., band gap regulator)
314		. . . . With additional stage
315		. . . Including parallel paths (e.g., current mirror)
316		. . . . With amplifier connected to or between current paths
317		. . . . With switched final control device
318		EXTERNAL OR OPERATOR CONTROLLED
319		. Zero switching
320		. Phase controlled switching using electronic tube or a three or more terminal semiconductive device
321		. . With soft start
322		. . With digital control
323		. . With interval timer
324		. . Using single unidirectional element with bidirectional pass
325		. . With a three or more terminal semiconductive device in trigger circuit
326		. . . Including ramp generator or controlled capacitor charging
327		. . With passive element only in trigger circuit
328		. Using a transformer or inductor as the final control device
329		. . Controllably saturable
330		. . . With permanent magnet
331		. . . With core having a gap, aperture, or slot
332		. . . With plural power windings
333		. . . . In bridge configuration or in bridge arm
334		. . . . On different legs of single core
335		. . . . On different cores
336		. . . . . Multistage
337		. . . . . Push-pull
338		. . . With plural cores
339		. . . Including an electronic tube or a three or more terminal semiconductive device in control circuit
340		. . Having a variable length winding (e.g., tapped) as the final control device
341		. . . With motor driven tap switch
342		. . . With other transformer
343		. . . With a three or more terminal semiconductive device
344		. . Having a windng in series with the source and load (e.g., buck-boost)
345		. . Having a switch in series with winding
346		. . Having series-parallel connectable windings
347		. . Having movable structure or winding
348		. . . Including rotary motion
349		. Using a three or more terminal semiconductive device as the final control device
350		. . Including plural final control devices
351		. . Switched (e.g., switching regulators)
352		. Using an impedance as the final control device
353		. . Resistor
354		. . . Selective
355		INCLUDING A TRANSFORMER OR AN INDUCTOR
356		. With compensation
357		. . For current transformer
358		. Current transformer
359		. Potential transformer
360		. Superconductive
361		. Polyphase or plural transformers
362		. With core having permanent magnet or air gap
363		. Inductor with or in a bridge
364		INCLUDING AN IMPEDANCE
365		. In a bridge
366		. . Thermistor
367		. . Resistor only
368		. Hall effect device or magnetoresistor
369		. Thermistor or resistor
370		. . With capacitor
371		MISCELLANEOUS
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		CROSS-REFERENCE ART COLLECTIONS
		******************************
901		STARTING CIRCUITS
902		OPTICAL COUPLING TO SEMICONDUCTOR
903		PRECIPITATORS
904		TOUCH SYSTEMS
905		LAMP DIMMER STRUCTURE
906		SOLAR CELL SYSTEMS
907		TEMPERATURE COMPENSATION OF SEMICONDUCTOR
908		INRUSH CURRENT LIMITERS
909		REMOTE SENSING
910		TWO OF THREE PHASES REGULATED
911		MEDICAL ELECTRONICS

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Last Modified: 6 October 2000