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Class   330AMPLIFIERS
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[List of Pre Grant Publications for class 330 subclass 1R][List of Patents for class 330 subclass 1R]  1R WITH DIVERSE-TYPE ART DEVICE
 [List of Pre Grant Publications for class 330 subclass 1A][List of Patents for class 330 subclass 1A]1A Subclass 1A indent level is 1 With process control system
 [List of Pre Grant Publications for class 330 subclass 2][List of Patents for class 330 subclass 2]2 WITH AMPLIFIER CONDITION INDICATING OR TESTING MEANS
 [List of Pre Grant Publications for class 330 subclass 3][List of Patents for class 330 subclass 3]3 WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES
 [List of Pre Grant Publications for class 330 subclass 4][List of Patents for class 330 subclass 4]4 WITH MASER-TYPE AMPLIFYING DEVICE
[List of Pre Grant Publications for class 330 subclass 4.5][List of Patents for class 330 subclass 4.5]4.5 PARAMETRIC AMPLIFIERS
[List of Pre Grant Publications for class 330 subclass 4.6][List of Patents for class 330 subclass 4.6]4.6 Subclass 4.6 indent level is 1 Traveling wave type
 [List of Pre Grant Publications for class 330 subclass 4.7][List of Patents for class 330 subclass 4.7]4.7 Subclass 4.7 indent level is 2 Electron beam device
 [List of Pre Grant Publications for class 330 subclass 4.8][List of Patents for class 330 subclass 4.8]4.8 Subclass 4.8 indent level is 1 Gyromagnetic type (e.g., ferrite)
 [List of Pre Grant Publications for class 330 subclass 4.9][List of Patents for class 330 subclass 4.9]4.9 Subclass 4.9 indent level is 1 Semiconductor type (e.g., with semiconductor diode)
[List of Pre Grant Publications for class 330 subclass 5][List of Patents for class 330 subclass 5]5 WITH SOLID ELEMENT WAVE PROPAGATING AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 5.5][List of Patents for class 330 subclass 5.5]5.5 Subclass 5.5 indent level is 1 Phonon type (e.g., ultrasonic wave propagating device)
 [List of Pre Grant Publications for class 330 subclass 6][List of Patents for class 330 subclass 6]6 WITH HALL EFFECT TYPE MEANS
 [List of Pre Grant Publications for class 330 subclass 7][List of Patents for class 330 subclass 7]7 WITH CAPACITIVE AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 8][List of Patents for class 330 subclass 8]8 WITH SATURABLE REACTOR-TYPE AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 9][List of Patents for class 330 subclass 9]9 WITH PERIODIC SWITCHING INPUT-OUTPUT (E.G., FOR DRIFT CORRECTION)
 [List of Pre Grant Publications for class 330 subclass 10][List of Patents for class 330 subclass 10]10 MODULATOR-DEMODULATOR-TYPE AMPLIFIER
 [List of Pre Grant Publications for class 330 subclass 11][List of Patents for class 330 subclass 11]11 WITH D.C. REINSERTION CIRCUIT
[List of Pre Grant Publications for class 330 subclass 250][List of Patents for class 330 subclass 250]250 WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR)
 [List of Pre Grant Publications for class 330 subclass 251][List of Patents for class 330 subclass 251]251 Subclass 251 indent level is 1 Including Class D amplifier
[List of Pre Grant Publications for class 330 subclass 252][List of Patents for class 330 subclass 252]252 Subclass 252 indent level is 1 Including differential amplifier
 [List of Pre Grant Publications for class 330 subclass 253][List of Patents for class 330 subclass 253]253 Subclass 253 indent level is 2 Having field effect transistor
 [List of Pre Grant Publications for class 330 subclass 254][List of Patents for class 330 subclass 254]254 Subclass 254 indent level is 2 Having gain control means
 [List of Pre Grant Publications for class 330 subclass 255][List of Patents for class 330 subclass 255]255 Subclass 255 indent level is 2 Having push-pull amplifier stage
 [List of Pre Grant Publications for class 330 subclass 256][List of Patents for class 330 subclass 256]256 Subclass 256 indent level is 2 Having temperature compensation means
 [List of Pre Grant Publications for class 330 subclass 257][List of Patents for class 330 subclass 257]257 Subclass 257 indent level is 2 Having current mirror amplifier
 [List of Pre Grant Publications for class 330 subclass 258][List of Patents for class 330 subclass 258]258 Subclass 258 indent level is 2 Having common mode rejection circuit
 [List of Pre Grant Publications for class 330 subclass 259][List of Patents for class 330 subclass 259]259 Subclass 259 indent level is 2 Having D.C. feedback bias control for stabilization
 [List of Pre Grant Publications for class 330 subclass 260][List of Patents for class 330 subclass 260]260 Subclass 260 indent level is 2 Having signal feedback means
 [List of Pre Grant Publications for class 330 subclass 261][List of Patents for class 330 subclass 261]261 Subclass 261 indent level is 2 Having particular biasing arrangement
[List of Pre Grant Publications for class 330 subclass 262][List of Patents for class 330 subclass 262]262 Subclass 262 indent level is 1 Including push-pull amplifier
[List of Pre Grant Publications for class 330 subclass 263][List of Patents for class 330 subclass 263]263 Subclass 263 indent level is 2 Having complementary symmetry
 [List of Pre Grant Publications for class 330 subclass 269][List of Patents for class 330 subclass 269]269 Subclass 269 indent level is 2 Having field effect transistor
 [List of Pre Grant Publications for class 330 subclass 270][List of Patents for class 330 subclass 270]270 Subclass 270 indent level is 2 Having D.C. feedback bias control for stabilization
 [List of Pre Grant Publications for class 330 subclass 271][List of Patents for class 330 subclass 271]271 Subclass 271 indent level is 2 Having signal feedback means
 [List of Pre Grant Publications for class 330 subclass 272][List of Patents for class 330 subclass 272]272 Subclass 272 indent level is 2 Having temperature compensating means
[List of Pre Grant Publications for class 330 subclass 273][List of Patents for class 330 subclass 273]273 Subclass 273 indent level is 2 Having particular biasing arrangement
 [List of Pre Grant Publications for class 330 subclass 275][List of Patents for class 330 subclass 275]275 Subclass 275 indent level is 2 Having balanced to unbalanced circuitry and vice versa
 [List of Pre Grant Publications for class 330 subclass 276][List of Patents for class 330 subclass 276]276 Subclass 276 indent level is 2 Having transformer
 [List of Pre Grant Publications for class 330 subclass 277][List of Patents for class 330 subclass 277]277 Subclass 277 indent level is 1 Including field effect transistor
[List of Pre Grant Publications for class 330 subclass 278][List of Patents for class 330 subclass 278]278 Subclass 278 indent level is 1 Including gain control means
[List of Pre Grant Publications for class 330 subclass 279][List of Patents for class 330 subclass 279]279 Subclass 279 indent level is 2 And significant control voltage developing means
[List of Pre Grant Publications for class 330 subclass 282][List of Patents for class 330 subclass 282]282 Subclass 282 indent level is 2 Having feedback means acting as variable impedance
 [List of Pre Grant Publications for class 330 subclass 284][List of Patents for class 330 subclass 284]284 Subclass 284 indent level is 2 Having attenuation means in signal transmission path
 [List of Pre Grant Publications for class 330 subclass 285][List of Patents for class 330 subclass 285]285 Subclass 285 indent level is 2 Having particular biasing means
[List of Pre Grant Publications for class 330 subclass 286][List of Patents for class 330 subclass 286]286 Subclass 286 indent level is 1 Including distributed parameter-type coupling
 [List of Pre Grant Publications for class 330 subclass 287][List of Patents for class 330 subclass 287]287 Subclass 287 indent level is 2 Of diode type
 [List of Pre Grant Publications for class 330 subclass 288][List of Patents for class 330 subclass 288]288 Subclass 288 indent level is 1 Including current mirror amplifier
 [List of Pre Grant Publications for class 330 subclass 289][List of Patents for class 330 subclass 289]289 Subclass 289 indent level is 1 Including temperature compensation means
 [List of Pre Grant Publications for class 330 subclass 290][List of Patents for class 330 subclass 290]290 Subclass 290 indent level is 1 Including D.C. feedback bias control for stabilization
[List of Pre Grant Publications for class 330 subclass 291][List of Patents for class 330 subclass 291]291 Subclass 291 indent level is 1 Including signal feedback means
 [List of Pre Grant Publications for class 330 subclass 292][List of Patents for class 330 subclass 292]292 Subclass 292 indent level is 2 Having compensation for interelectrode impedance
 [List of Pre Grant Publications for class 330 subclass 293][List of Patents for class 330 subclass 293]293 Subclass 293 indent level is 2 Having negative feedback
 [List of Pre Grant Publications for class 330 subclass 294][List of Patents for class 330 subclass 294]294 Subclass 294 indent level is 2 Having frequency-responsive means or phase-shift means in feedback path
 [List of Pre Grant Publications for class 330 subclass 295][List of Patents for class 330 subclass 295]295 Subclass 295 indent level is 1 Including plural amplifier channels
 [List of Pre Grant Publications for class 330 subclass 296][List of Patents for class 330 subclass 296]296 Subclass 296 indent level is 1 Including particular biasing arrangement
 [List of Pre Grant Publications for class 330 subclass 297][List of Patents for class 330 subclass 297]297 Subclass 297 indent level is 1 Including particular power supply circuitry
 [List of Pre Grant Publications for class 330 subclass 298][List of Patents for class 330 subclass 298]298 Subclass 298 indent level is 1 Including protection means
[List of Pre Grant Publications for class 330 subclass 299][List of Patents for class 330 subclass 299]299 Subclass 299 indent level is 1 Including combined diverse-type semiconductor device
 [List of Pre Grant Publications for class 330 subclass 300][List of Patents for class 330 subclass 300]300 Subclass 300 indent level is 2 Bipolar or unipolar (FET)
 [List of Pre Grant Publications for class 330 subclass 301][List of Patents for class 330 subclass 301]301 Subclass 301 indent level is 1 Including balanced to unbalanced circuits and vice versa
[List of Pre Grant Publications for class 330 subclass 302][List of Patents for class 330 subclass 302]302 Subclass 302 indent level is 1 Including frequency-responsive means in the signal transmission path
 [List of Pre Grant Publications for class 330 subclass 303][List of Patents for class 330 subclass 303]303 Subclass 303 indent level is 2 Including an active device in the filter means
 [List of Pre Grant Publications for class 330 subclass 304][List of Patents for class 330 subclass 304]304 Subclass 304 indent level is 2 And equalizing means
 [List of Pre Grant Publications for class 330 subclass 305][List of Patents for class 330 subclass 305]305 Subclass 305 indent level is 2 And tuning means
 [List of Pre Grant Publications for class 330 subclass 306][List of Patents for class 330 subclass 306]306 Subclass 306 indent level is 2 And bandpass, broadband (e.g., wideband) or sidepass means
 [List of Pre Grant Publications for class 330 subclass 307][List of Patents for class 330 subclass 307]307 Subclass 307 indent level is 1 Integrated circuits
 [List of Pre Grant Publications for class 330 subclass 308][List of Patents for class 330 subclass 308]308 Subclass 308 indent level is 1 Including atomic particle or radiant energy impinging on a semiconductor
 [List of Pre Grant Publications for class 330 subclass 309][List of Patents for class 330 subclass 309]309 Subclass 309 indent level is 1 Involving structure of three diverse function electrode type
[List of Pre Grant Publications for class 330 subclass 310][List of Patents for class 330 subclass 310]310 Subclass 310 indent level is 1 Including plural stages cascaded
 [List of Pre Grant Publications for class 330 subclass 311][List of Patents for class 330 subclass 311]311 Subclass 311 indent level is 2 Having different configurations
 [List of Pre Grant Publications for class 330 subclass 41][List of Patents for class 330 subclass 41]41 WITH GAS OR VAPOR TUBE AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 42][List of Patents for class 330 subclass 42]42 WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 43][List of Patents for class 330 subclass 43]43 WITH TRAVELING WAVE-TYPE TUBE
[List of Pre Grant Publications for class 330 subclass 44][List of Patents for class 330 subclass 44]44 WITH ELECTRON BEAM TUBE AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 45][List of Patents for class 330 subclass 45]45 Subclass 45 indent level is 1 Having electrode coupled to cavity resonator
 [List of Pre Grant Publications for class 330 subclass 46][List of Patents for class 330 subclass 46]46 Subclass 46 indent level is 1 Having deflecting means
[List of Pre Grant Publications for class 330 subclass 47][List of Patents for class 330 subclass 47]47 WITH MAGNETICALLY INFLUENCED DISCHARGE DEVICE (E.G., MAGNETRONS)
 [List of Pre Grant Publications for class 330 subclass 48][List of Patents for class 330 subclass 48]48 Subclass 48 indent level is 1 Having signal applied to magnetic means
 [List of Pre Grant Publications for class 330 subclass 49][List of Patents for class 330 subclass 49]49 WITH VACUUM TUBE HAVING DISTRIBUTED PARAMETER IMPEDANCE CHARACTERISTICS
 [List of Pre Grant Publications for class 330 subclass 50][List of Patents for class 330 subclass 50]50 WITH DUMMY TUBE
 [List of Pre Grant Publications for class 330 subclass 51][List of Patents for class 330 subclass 51]51 COMBINED WITH AUTOMATIC AMPLIFIER DISABLING SWITCH MEANS
 [List of Pre Grant Publications for class 330 subclass 52][List of Patents for class 330 subclass 52]52 WITH PILOT FREQUENCY CONTROL MEANS
[List of Pre Grant Publications for class 330 subclass 53][List of Patents for class 330 subclass 53]53 WITH DISTRIBUTED PARAMETER-TYPE COUPLING MEANS
 [List of Pre Grant Publications for class 330 subclass 54][List of Patents for class 330 subclass 54]54 Subclass 54 indent level is 1 Distributed amplifier
 [List of Pre Grant Publications for class 330 subclass 55][List of Patents for class 330 subclass 55]55 Subclass 55 indent level is 1 Push-pull
 [List of Pre Grant Publications for class 330 subclass 56][List of Patents for class 330 subclass 56]56 Subclass 56 indent level is 1 Waveguide, cavity, or concentric line resonator
 [List of Pre Grant Publications for class 330 subclass 57][List of Patents for class 330 subclass 57]57 Subclass 57 indent level is 1 Artificial line
 [List of Pre Grant Publications for class 330 subclass 58][List of Patents for class 330 subclass 58]58 WITH ROTATING DYNAMOELECTRIC AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 59][List of Patents for class 330 subclass 59]59 HAVING LIGHT-CONTROLLED OR ACTIVATED DEVICE (I.E., NOT LIGHT SIGNAL)
 [List of Pre Grant Publications for class 330 subclass 60][List of Patents for class 330 subclass 60]60 HAVING MAGNETOSTRICTIVE-TYPE AMPLIFYING DEVICE
[List of Pre Grant Publications for class 330 subclass 61R][List of Patents for class 330 subclass 61R]  61R WITH RESISTIVE-TYPE AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 62][List of Patents for class 330 subclass 62]62 Subclass 62 indent level is 1 Magnetoresistive type
 [List of Pre Grant Publications for class 330 subclass 61A][List of Patents for class 330 subclass 61A]61A Subclass 61A indent level is 1 Negative resistance amplifiers
 [List of Pre Grant Publications for class 330 subclass 63][List of Patents for class 330 subclass 63]63 WITH MAGNETIC MEANS AMPLIFYING DEVICE
 [List of Pre Grant Publications for class 330 subclass 64][List of Patents for class 330 subclass 64]64 WITH SPACE CHARGE GRID TUBE
[List of Pre Grant Publications for class 330 subclass 65][List of Patents for class 330 subclass 65]65 INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE
 [List of Pre Grant Publications for class 330 subclass 66][List of Patents for class 330 subclass 66]66 Subclass 66 indent level is 1 With printed circuits
 [List of Pre Grant Publications for class 330 subclass 67][List of Patents for class 330 subclass 67]67 Subclass 67 indent level is 1 With capacitive structure
 [List of Pre Grant Publications for class 330 subclass 68][List of Patents for class 330 subclass 68]68 Subclass 68 indent level is 1 With shielding means
 [List of Pre Grant Publications for class 330 subclass 69][List of Patents for class 330 subclass 69]69 SUM AND DIFFERENCE AMPLIFIERS
[List of Pre Grant Publications for class 330 subclass 70][List of Patents for class 330 subclass 70]70 ANODE ENERGIZED THROUGH DISCHARGE PATH OF CONTROLLED VACUUM TUBE
[List of Pre Grant Publications for class 330 subclass 71][List of Patents for class 330 subclass 71]71 Subclass 71 indent level is 1 Plural discharge paths traversed by anode supply
 [List of Pre Grant Publications for class 330 subclass 72][List of Patents for class 330 subclass 72]72 Subclass 72 indent level is 2 Amplifier devices in arms of a bridge
 [List of Pre Grant Publications for class 330 subclass 73][List of Patents for class 330 subclass 73]73 Subclass 73 indent level is 1 Plural outputs
 [List of Pre Grant Publications for class 330 subclass 74][List of Patents for class 330 subclass 74]74 Subclass 74 indent level is 1 Separate signal inputs to series devices
[List of Pre Grant Publications for class 330 subclass 75][List of Patents for class 330 subclass 75]75 SIGNAL FEEDBACK
[List of Pre Grant Publications for class 330 subclass 76][List of Patents for class 330 subclass 76]76 Subclass 76 indent level is 1 Compensating for inter-electrode impedance (e.g., neutralization)
 [List of Pre Grant Publications for class 330 subclass 77][List of Patents for class 330 subclass 77]77 Subclass 77 indent level is 2 At least one push-pull stage
 [List of Pre Grant Publications for class 330 subclass 78][List of Patents for class 330 subclass 78]78 Subclass 78 indent level is 2 To or from electrode common to input and output
 [List of Pre Grant Publications for class 330 subclass 79][List of Patents for class 330 subclass 79]79 Subclass 79 indent level is 2 By transformer feedback
 [List of Pre Grant Publications for class 330 subclass 80][List of Patents for class 330 subclass 80]80 Subclass 80 indent level is 2 By coil in parallel to and resonating with inter-electrode capacity
[List of Pre Grant Publications for class 330 subclass 81][List of Patents for class 330 subclass 81]81 Subclass 81 indent level is 1 At least one push-pull signal stage
 [List of Pre Grant Publications for class 330 subclass 82][List of Patents for class 330 subclass 82]82 Subclass 82 indent level is 2 Positive and negative feedback
 [List of Pre Grant Publications for class 330 subclass 83][List of Patents for class 330 subclass 83]83 Subclass 83 indent level is 2 Including D.C. path for signal feedback
 [List of Pre Grant Publications for class 330 subclass 84][List of Patents for class 330 subclass 84]84 Subclass 84 indent level is 1 Plural amplifier channels
 [List of Pre Grant Publications for class 330 subclass 85][List of Patents for class 330 subclass 85]85 Subclass 85 indent level is 1 Amplifier in signal feedback path
 [List of Pre Grant Publications for class 330 subclass 86][List of Patents for class 330 subclass 86]86 Subclass 86 indent level is 1 Variable impedance in feedback path varied by separate control path
[List of Pre Grant Publications for class 330 subclass 87][List of Patents for class 330 subclass 87]87 Subclass 87 indent level is 1 Cathode impedance feedback
[List of Pre Grant Publications for class 330 subclass 88][List of Patents for class 330 subclass 88]88 Subclass 88 indent level is 2 Cascade amplifier stages with cathode-cathode feedback
[List of Pre Grant Publications for class 330 subclass 90][List of Patents for class 330 subclass 90]90 Subclass 90 indent level is 2 Combined with diverse-type feedback coupling
 [List of Pre Grant Publications for class 330 subclass 94][List of Patents for class 330 subclass 94]94 Subclass 94 indent level is 2 Frequency responsive means in cathode impedance feedback path
 [List of Pre Grant Publications for class 330 subclass 95][List of Patents for class 330 subclass 95]95 Subclass 95 indent level is 2 Nonlinear impedance means in cathode impedance feedback path
 [List of Pre Grant Publications for class 330 subclass 96][List of Patents for class 330 subclass 96]96 Subclass 96 indent level is 1 Combined with control of bias voltage of signal amplifier
 [List of Pre Grant Publications for class 330 subclass 97][List of Patents for class 330 subclass 97]97 Subclass 97 indent level is 1 Including D.C. path for signal feedback
[List of Pre Grant Publications for class 330 subclass 98][List of Patents for class 330 subclass 98]98 Subclass 98 indent level is 1 In cascade amplifiers
[List of Pre Grant Publications for class 330 subclass 99][List of Patents for class 330 subclass 99]99 Subclass 99 indent level is 2 Multiple feedback
 [List of Pre Grant Publications for class 330 subclass 101][List of Patents for class 330 subclass 101]101 Subclass 101 indent level is 1 Positive and negative feedback in same path at different frequencies
 [List of Pre Grant Publications for class 330 subclass 102][List of Patents for class 330 subclass 102]102 Subclass 102 indent level is 1 Current and voltage feedback
[List of Pre Grant Publications for class 330 subclass 103][List of Patents for class 330 subclass 103]103 Subclass 103 indent level is 1 Multiple feedback paths
 [List of Pre Grant Publications for class 330 subclass 104][List of Patents for class 330 subclass 104]104 Subclass 104 indent level is 2 Positive and negative feedback
 [List of Pre Grant Publications for class 330 subclass 105][List of Patents for class 330 subclass 105]105 Subclass 105 indent level is 1 From impedance in series with output load (e.g., current feedback)
 [List of Pre Grant Publications for class 330 subclass 106][List of Patents for class 330 subclass 106]106 Subclass 106 indent level is 1 In series with input source
 [List of Pre Grant Publications for class 330 subclass 107][List of Patents for class 330 subclass 107]107 Subclass 107 indent level is 1 Phase shift means in loop path
 [List of Pre Grant Publications for class 330 subclass 108][List of Patents for class 330 subclass 108]108 Subclass 108 indent level is 1 Potentiometer common to signal and feedback path
 [List of Pre Grant Publications for class 330 subclass 109][List of Patents for class 330 subclass 109]109 Subclass 109 indent level is 1 Frequency responsive feedback means
 [List of Pre Grant Publications for class 330 subclass 110][List of Patents for class 330 subclass 110]110 Subclass 110 indent level is 1 Nonlinear impedance element in loop path
 [List of Pre Grant Publications for class 330 subclass 111][List of Patents for class 330 subclass 111]111 Subclass 111 indent level is 1 To or from an auxiliary grid or to the anode
 [List of Pre Grant Publications for class 330 subclass 112][List of Patents for class 330 subclass 112]112 Subclass 112 indent level is 1 Positive feedback
 [List of Pre Grant Publications for class 330 subclass 113][List of Patents for class 330 subclass 113]113 POLYPHASE POWER SUPPLY (I.E., FOR AN ELECTRODE, CATHODE HEATER, OR FILAMENT)
[List of Pre Grant Publications for class 330 subclass 114][List of Patents for class 330 subclass 114]114 UNRECTIFIED A.C. POWER SUPPLY FOR AN ELECTRODE (I.E., NOT THE HEATER)
 [List of Pre Grant Publications for class 330 subclass 115][List of Patents for class 330 subclass 115]115 Subclass 115 indent level is 1 Applied to filamentary cathode
 [List of Pre Grant Publications for class 330 subclass 116][List of Patents for class 330 subclass 116]116 WITH BALANCED-TO-UNBALANCED COUPLING
 [List of Pre Grant Publications for class 330 subclass 117][List of Patents for class 330 subclass 117]117 WITH UNBALANCED-TO-BALANCED COUPLING
[List of Pre Grant Publications for class 330 subclass 118][List of Patents for class 330 subclass 118]118 INCLUDING A PUSH-PULL STAGE
 [List of Pre Grant Publications for class 330 subclass 119][List of Patents for class 330 subclass 119]119 Subclass 119 indent level is 1 Coupling to or from cathode in push-pull
[List of Pre Grant Publications for class 330 subclass 120][List of Patents for class 330 subclass 120]120 Subclass 120 indent level is 1 Interstage coupling between push-pull
 [List of Pre Grant Publications for class 330 subclass 121][List of Patents for class 330 subclass 121]121 Subclass 121 indent level is 2 D.C. coupling
 [List of Pre Grant Publications for class 330 subclass 122][List of Patents for class 330 subclass 122]122 Subclass 122 indent level is 1 Input and/or output coupling for push-pull
 [List of Pre Grant Publications for class 330 subclass 123][List of Patents for class 330 subclass 123]123 Subclass 123 indent level is 1 Power or bias supply circuits and control thereof
[List of Pre Grant Publications for class 330 subclass 124R][List of Patents for class 330 subclass 124R]  124R WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS)
 [List of Pre Grant Publications for class 330 subclass 125][List of Patents for class 330 subclass 125]125 Subclass 125 indent level is 1 D.C. and A.C. amplifier channels
 [List of Pre Grant Publications for class 330 subclass 126][List of Patents for class 330 subclass 126]126 Subclass 126 indent level is 1 Amplifying different frequencies in different channels
 [List of Pre Grant Publications for class 330 subclass 124D][List of Patents for class 330 subclass 124D]124D Subclass 124D indent level is 1 Redundant amplifier circuits
[List of Pre Grant Publications for class 330 subclass 127][List of Patents for class 330 subclass 127]127 WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE
 [List of Pre Grant Publications for class 330 subclass 128][List of Patents for class 330 subclass 128]128 Subclass 128 indent level is 1 Control means for anode of screen grid circuit
[List of Pre Grant Publications for class 330 subclass 129][List of Patents for class 330 subclass 129]129 Subclass 129 indent level is 1 With control of input electrode or gain control electrode bias
 [List of Pre Grant Publications for class 330 subclass 130][List of Patents for class 330 subclass 130]130 Subclass 130 indent level is 2 Bias controlled by separate external control source
 [List of Pre Grant Publications for class 330 subclass 131][List of Patents for class 330 subclass 131]131 Subclass 131 indent level is 2 Control of bias on separate gain control electrode
 [List of Pre Grant Publications for class 330 subclass 132][List of Patents for class 330 subclass 132]132 Subclass 132 indent level is 2 Frequency selective means to select control signal from amplifier channel
 [List of Pre Grant Publications for class 330 subclass 133][List of Patents for class 330 subclass 133]133 Subclass 133 indent level is 2 Different bias control means for different stages of cascade amplifier
 [List of Pre Grant Publications for class 330 subclass 134][List of Patents for class 330 subclass 134]134 Subclass 134 indent level is 2 Plural different bias control voltages provided by separate means
 [List of Pre Grant Publications for class 330 subclass 135][List of Patents for class 330 subclass 135]135 Subclass 135 indent level is 2 Amplitude limiting or bias voltage
 [List of Pre Grant Publications for class 330 subclass 136][List of Patents for class 330 subclass 136]136 Subclass 136 indent level is 2 Bias control signal from input of amplifier
 [List of Pre Grant Publications for class 330 subclass 137][List of Patents for class 330 subclass 137]137 Subclass 137 indent level is 2 Oscillator supplies or controls bias
 [List of Pre Grant Publications for class 330 subclass 138][List of Patents for class 330 subclass 138]138 Subclass 138 indent level is 2 Bias controlled by biased rectifier or discharge device
 [List of Pre Grant Publications for class 330 subclass 139][List of Patents for class 330 subclass 139]139 Subclass 139 indent level is 2 Electronic tube controls bias
 [List of Pre Grant Publications for class 330 subclass 140][List of Patents for class 330 subclass 140]140 Subclass 140 indent level is 2 Rectifier in bias control circuit
 [List of Pre Grant Publications for class 330 subclass 141][List of Patents for class 330 subclass 141]141 Subclass 141 indent level is 2 Time constant circuit in bias control circuit
 [List of Pre Grant Publications for class 330 subclass 142][List of Patents for class 330 subclass 142]142 Subclass 142 indent level is 2 Cathode resistor supplies bias (e.g., self-biasing circuits)
 [List of Pre Grant Publications for class 330 subclass 143][List of Patents for class 330 subclass 143]143 THERMALLY RESPONSIVE IMPEDANCE
[List of Pre Grant Publications for class 330 subclass 144][List of Patents for class 330 subclass 144]144 VARIABLE IMPEDANCE FOR SIGNAL CHANNEL CONTROLLED BY SEPARATE CONTROL PATH
 [List of Pre Grant Publications for class 330 subclass 145][List of Patents for class 330 subclass 145]145 Subclass 145 indent level is 1 Electron tube or diode as impedance
 [List of Pre Grant Publications for class 330 subclass 146][List of Patents for class 330 subclass 146]146 WHEATSTONE BRIDGE WITH AMPLIFIER IN AT LEAST ONE ARM
 [List of Pre Grant Publications for class 330 subclass 147][List of Patents for class 330 subclass 147]147 PLURAL SIGNAL INPUTS
 [List of Pre Grant Publications for class 330 subclass 148][List of Patents for class 330 subclass 148]148 PLURAL SIGNAL OUTPUTS
 [List of Pre Grant Publications for class 330 subclass 149][List of Patents for class 330 subclass 149]149 HUM OR NOISE OR DISTORTION BUCKING INTRODUCED INTO SIGNAL CHANNEL
 [List of Pre Grant Publications for class 330 subclass 150][List of Patents for class 330 subclass 150]150 CASCADED SIMILAR AMPLIFYING DEVICE OF DIFFERENT CHARACTERISTICS
 [List of Pre Grant Publications for class 330 subclass 151][List of Patents for class 330 subclass 151]151 WITH AMPLIFIER BYPASS MEANS (E.G., FORWARD FEED)
[List of Pre Grant Publications for class 330 subclass 152][List of Patents for class 330 subclass 152]152 CASCADED DIFFERENTLY COUPLED BETWEEN STAGES
 [List of Pre Grant Publications for class 330 subclass 153][List of Patents for class 330 subclass 153]153 Subclass 153 indent level is 1 Including a cathode follower stage
 [List of Pre Grant Publications for class 330 subclass 154][List of Patents for class 330 subclass 154]154 Subclass 154 indent level is 1 Transformer or resonant circuit in interstage coupling (e.g., stagger tuning)
 [List of Pre Grant Publications for class 330 subclass 155][List of Patents for class 330 subclass 155]155 UNICONTROL OF COUPLING OR THE CIRCUITS ASSOCIATED THEREWITH
 [List of Pre Grant Publications for class 330 subclass 156][List of Patents for class 330 subclass 156]156 BOOTSTRAP COUPLING
[List of Pre Grant Publications for class 330 subclass 157][List of Patents for class 330 subclass 157]157 INTERSTAGE COUPLING
[List of Pre Grant Publications for class 330 subclass 158][List of Patents for class 330 subclass 158]158 Subclass 158 indent level is 1 Coupling to cathode
 [List of Pre Grant Publications for class 330 subclass 159][List of Patents for class 330 subclass 159]159 Subclass 159 indent level is 2 D.C. coupling
[List of Pre Grant Publications for class 330 subclass 160][List of Patents for class 330 subclass 160]160 Subclass 160 indent level is 1 Coupling to plate or auxiliary grid
 [List of Pre Grant Publications for class 330 subclass 161][List of Patents for class 330 subclass 161]161 Subclass 161 indent level is 2 D.C. coupling
[List of Pre Grant Publications for class 330 subclass 162][List of Patents for class 330 subclass 162]162 Subclass 162 indent level is 1 Output coupling from grid
 [List of Pre Grant Publications for class 330 subclass 163][List of Patents for class 330 subclass 163]163 Subclass 163 indent level is 2 D.C. coupling
 [List of Pre Grant Publications for class 330 subclass 164][List of Patents for class 330 subclass 164]164 Subclass 164 indent level is 1 With electronic tube or diode in coupling circuit
[List of Pre Grant Publications for class 330 subclass 165][List of Patents for class 330 subclass 165]165 Subclass 165 indent level is 1 Transformer coupling
 [List of Pre Grant Publications for class 330 subclass 166][List of Patents for class 330 subclass 166]166 Subclass 166 indent level is 2 With additional reactive coupling
 [List of Pre Grant Publications for class 330 subclass 167][List of Patents for class 330 subclass 167]167 Subclass 167 indent level is 2 With additional impedance connected to "P" or "S" circuits
 [List of Pre Grant Publications for class 330 subclass 168][List of Patents for class 330 subclass 168]168 Subclass 168 indent level is 2 From cathode
 [List of Pre Grant Publications for class 330 subclass 169][List of Patents for class 330 subclass 169]169 Subclass 169 indent level is 2 With means for adjusting inductive coupling
 [List of Pre Grant Publications for class 330 subclass 170][List of Patents for class 330 subclass 170]170 Subclass 170 indent level is 2 With shielding
 [List of Pre Grant Publications for class 330 subclass 171][List of Patents for class 330 subclass 171]171 Subclass 171 indent level is 2 With transformer structure
[List of Pre Grant Publications for class 330 subclass 172][List of Patents for class 330 subclass 172]172 Subclass 172 indent level is 1 Coupling from cathode
 [List of Pre Grant Publications for class 330 subclass 173][List of Patents for class 330 subclass 173]173 Subclass 173 indent level is 2 D.C. coupling
 [List of Pre Grant Publications for class 330 subclass 174][List of Patents for class 330 subclass 174]174 Subclass 174 indent level is 1 With electromechanical transducer (e.g., piezoelectric crystal)
 [List of Pre Grant Publications for class 330 subclass 175][List of Patents for class 330 subclass 175]175 Subclass 175 indent level is 1 With lattice or Wheatstone bridge network in coupling circuits
 [List of Pre Grant Publications for class 330 subclass 176][List of Patents for class 330 subclass 176]176 Subclass 176 indent level is 1 With T, H, or Pi network in coupling circuit
[List of Pre Grant Publications for class 330 subclass 177][List of Patents for class 330 subclass 177]177 Subclass 177 indent level is 1 With coupling or blocking capacitor
 [List of Pre Grant Publications for class 330 subclass 178][List of Patents for class 330 subclass 178]178 Subclass 178 indent level is 2 With R or L in series between stages
 [List of Pre Grant Publications for class 330 subclass 179][List of Patents for class 330 subclass 179]179 Subclass 179 indent level is 2 L in anode or grid circuit
 [List of Pre Grant Publications for class 330 subclass 180][List of Patents for class 330 subclass 180]180 Subclass 180 indent level is 2 With R in anode and grid circuit (RC coupling)
[List of Pre Grant Publications for class 330 subclass 181][List of Patents for class 330 subclass 181]181 Subclass 181 indent level is 1 D.C. coupled
 [List of Pre Grant Publications for class 330 subclass 182][List of Patents for class 330 subclass 182]182 Subclass 182 indent level is 2 With series reactive element between stages
 [List of Pre Grant Publications for class 330 subclass 183][List of Patents for class 330 subclass 183]183 Subclass 183 indent level is 2 With nonlinear device
 [List of Pre Grant Publications for class 330 subclass 184][List of Patents for class 330 subclass 184]184 Subclass 184 indent level is 2 With series resistance between stages
[List of Pre Grant Publications for class 330 subclass 185][List of Patents for class 330 subclass 185]185 INPUT NETWORKS
[List of Pre Grant Publications for class 330 subclass 186][List of Patents for class 330 subclass 186]186 Subclass 186 indent level is 1 To cathode
 [List of Pre Grant Publications for class 330 subclass 187][List of Patents for class 330 subclass 187]187 Subclass 187 indent level is 2 D.C. coupled
[List of Pre Grant Publications for class 330 subclass 188][List of Patents for class 330 subclass 188]188 Subclass 188 indent level is 1 Transformer coupled
 [List of Pre Grant Publications for class 330 subclass 189][List of Patents for class 330 subclass 189]189 Subclass 189 indent level is 2 With additional impedance connected to "P" or "S" circuits
 [List of Pre Grant Publications for class 330 subclass 190][List of Patents for class 330 subclass 190]190 Subclass 190 indent level is 2 With transformer structure
 [List of Pre Grant Publications for class 330 subclass 191][List of Patents for class 330 subclass 191]191 Subclass 191 indent level is 1 D.C. coupled
[List of Pre Grant Publications for class 330 subclass 192][List of Patents for class 330 subclass 192]192 OUTPUT NETWORKS
[List of Pre Grant Publications for class 330 subclass 193][List of Patents for class 330 subclass 193]193 Subclass 193 indent level is 1 From cathode
 [List of Pre Grant Publications for class 330 subclass 194][List of Patents for class 330 subclass 194]194 Subclass 194 indent level is 2 D.C. coupled
[List of Pre Grant Publications for class 330 subclass 195][List of Patents for class 330 subclass 195]195 Subclass 195 indent level is 1 Transformer coupled
 [List of Pre Grant Publications for class 330 subclass 196][List of Patents for class 330 subclass 196]196 Subclass 196 indent level is 2 With additional impedance connected to "P" or "S" circuit
 [List of Pre Grant Publications for class 330 subclass 197][List of Patents for class 330 subclass 197]197 Subclass 197 indent level is 2 With transformer structure
 [List of Pre Grant Publications for class 330 subclass 198][List of Patents for class 330 subclass 198]198 Subclass 198 indent level is 1 D.C. coupled
[List of Pre Grant Publications for class 330 subclass 199][List of Patents for class 330 subclass 199]199 WITH POWER OR BIAS VOLTAGE SUPPLY
[List of Pre Grant Publications for class 330 subclass 200][List of Patents for class 330 subclass 200]200 Subclass 200 indent level is 1 For plural stage amplifier
 [List of Pre Grant Publications for class 330 subclass 201][List of Patents for class 330 subclass 201]201 Subclass 201 indent level is 2 Filamentary cathodes heated by anode current or anode supply source
[List of Pre Grant Publications for class 330 subclass 202][List of Patents for class 330 subclass 202]202 Subclass 202 indent level is 1 For anode
 [List of Pre Grant Publications for class 330 subclass 203][List of Patents for class 330 subclass 203]203 Subclass 203 indent level is 2 And input electrode
[List of Pre Grant Publications for class 330 subclass 204][List of Patents for class 330 subclass 204]204 Subclass 204 indent level is 1 For input electrode
 [List of Pre Grant Publications for class 330 subclass 205][List of Patents for class 330 subclass 205]205 Subclass 205 indent level is 2 And filamentary cathode
 [List of Pre Grant Publications for class 330 subclass 206][List of Patents for class 330 subclass 206]206 Subclass 206 indent level is 1 For filamentary cathode
[List of Pre Grant Publications for class 330 subclass 207R][List of Patents for class 330 subclass 207R]  207R MISCELLANEOUS
 [List of Pre Grant Publications for class 330 subclass 207A][List of Patents for class 330 subclass 207A]207A Subclass 207A indent level is 1 Class D
 [List of Pre Grant Publications for class 330 subclass 207P][List of Patents for class 330 subclass 207P]207P Subclass 207P indent level is 1 Amplifier protection means
 
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