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Class   331OSCILLATORS
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 [List of Pre Grant Publications for class 331 subclass 94.1][List of Patents for class 331 subclass 94.1]94.1 MOLECULAR OR PARTICLE RESONANT TYPE (E.G., MASER)
[List of Pre Grant Publications for class 331 subclass 1R][List of Patents for class 331 subclass 1R]  1R AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS
 [List of Pre Grant Publications for class 331 subclass 2][List of Patents for class 331 subclass 2]2 Subclass 2 indent level is 1 Plural oscillators controlled
 [List of Pre Grant Publications for class 331 subclass 3][List of Patents for class 331 subclass 3]3 Subclass 3 indent level is 1 Molecular resonance stabilization
 [List of Pre Grant Publications for class 331 subclass 4][List of Patents for class 331 subclass 4]4 Subclass 4 indent level is 1 Search sweep of oscillator
 [List of Pre Grant Publications for class 331 subclass 5][List of Patents for class 331 subclass 5]5 Subclass 5 indent level is 1 Magnetron oscillator
[List of Pre Grant Publications for class 331 subclass 6][List of Patents for class 331 subclass 6]6 Subclass 6 indent level is 1 Klystron oscillator
 [List of Pre Grant Publications for class 331 subclass 7][List of Patents for class 331 subclass 7]7 Subclass 7 indent level is 2 Plural controls
 [List of Pre Grant Publications for class 331 subclass 8][List of Patents for class 331 subclass 8]8 Subclass 8 indent level is 1 Transistorized controls
 [List of Pre Grant Publications for class 331 subclass 9][List of Patents for class 331 subclass 9]9 Subclass 9 indent level is 1 Oscillator with distributed parameter-type discriminator
[List of Pre Grant Publications for class 331 subclass 10][List of Patents for class 331 subclass 10]10 Subclass 10 indent level is 1 Plural A.F.S. for a single oscillator
[List of Pre Grant Publications for class 331 subclass 11][List of Patents for class 331 subclass 11]11 Subclass 11 indent level is 2 Plural comparators or discriminators
 [List of Pre Grant Publications for class 331 subclass 13][List of Patents for class 331 subclass 13]13 Subclass 13 indent level is 2 Motor control of oscillator
 [List of Pre Grant Publications for class 331 subclass 14][List of Patents for class 331 subclass 14]14 Subclass 14 indent level is 1 With intermittent comparison controls
 [List of Pre Grant Publications for class 331 subclass 15][List of Patents for class 331 subclass 15]15 Subclass 15 indent level is 1 Amplitude compensation
 [List of Pre Grant Publications for class 331 subclass 16][List of Patents for class 331 subclass 16]16 Subclass 16 indent level is 1 Tuning compensation
 [List of Pre Grant Publications for class 331 subclass 17][List of Patents for class 331 subclass 17]17 Subclass 17 indent level is 1 Particular error voltage control (e.g., intergrating network)
[List of Pre Grant Publications for class 331 subclass 18][List of Patents for class 331 subclass 18]18 Subclass 18 indent level is 1 With reference oscillator or source
 [List of Pre Grant Publications for class 331 subclass 19][List of Patents for class 331 subclass 19]19 Subclass 19 indent level is 2 Spectrum reference source
[List of Pre Grant Publications for class 331 subclass 20][List of Patents for class 331 subclass 20]20 Subclass 20 indent level is 2 T.V. sync type
 [List of Pre Grant Publications for class 331 subclass 22][List of Patents for class 331 subclass 22]22 Subclass 22 indent level is 2 Plural significant heterodyne stages
[List of Pre Grant Publications for class 331 subclass 23][List of Patents for class 331 subclass 23]23 Subclass 23 indent level is 2 Sensing modulation (e.g., frequency modulation controlled oscillator
[List of Pre Grant Publications for class 331 subclass 25][List of Patents for class 331 subclass 25]25 Subclass 25 indent level is 2 Signal or phase comparator
[List of Pre Grant Publications for class 331 subclass 30][List of Patents for class 331 subclass 30]30 Subclass 30 indent level is 1 With stable heterodyne oscillator or source
 [List of Pre Grant Publications for class 331 subclass 31][List of Patents for class 331 subclass 31]31 Subclass 31 indent level is 2 Plural significant heterodyne stages
[List of Pre Grant Publications for class 331 subclass 32][List of Patents for class 331 subclass 32]32 Subclass 32 indent level is 2 With particular discriminator (e.g., LPF and HPF)
[List of Pre Grant Publications for class 331 subclass 34][List of Patents for class 331 subclass 34]34 Subclass 34 indent level is 1 Particular frequency control means
 [List of Pre Grant Publications for class 331 subclass 35][List of Patents for class 331 subclass 35]35 Subclass 35 indent level is 2 Electromechanical (e.g., motor)
[List of Pre Grant Publications for class 331 subclass 36R][List of Patents for class 331 subclass 36R]  36R Subclass 36R indent level is 2 Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.)
 [List of Pre Grant Publications for class 331 subclass 1A][List of Patents for class 331 subclass 1A]1A Subclass 1A indent level is 1 AFC with logic elements
[List of Pre Grant Publications for class 331 subclass 37][List of Patents for class 331 subclass 37]37 BEAT FREQUENCY
[List of Pre Grant Publications for class 331 subclass 38][List of Patents for class 331 subclass 38]38 Subclass 38 indent level is 1 Plural beating
 [List of Pre Grant Publications for class 331 subclass 39][List of Patents for class 331 subclass 39]39 Subclass 39 indent level is 2 Single channel
 [List of Pre Grant Publications for class 331 subclass 40][List of Patents for class 331 subclass 40]40 Subclass 40 indent level is 1 Frequency or amplitude adjustment or control
 [List of Pre Grant Publications for class 331 subclass 41][List of Patents for class 331 subclass 41]41 Subclass 41 indent level is 1 Frequency stabilization
[List of Pre Grant Publications for class 331 subclass 42][List of Patents for class 331 subclass 42]42 Subclass 42 indent level is 1 With particular signal combining means (e.g., cavity mixer)
 [List of Pre Grant Publications for class 331 subclass 43][List of Patents for class 331 subclass 43]43 Subclass 43 indent level is 2 With filter in mixer output circuit
 [List of Pre Grant Publications for class 331 subclass 44][List of Patents for class 331 subclass 44]44 WITH FREQUENCY CALIBRATION OR TESTING
 [List of Pre Grant Publications for class 331 subclass 45][List of Patents for class 331 subclass 45]45 POLYPHASE OUTPUT
[List of Pre Grant Publications for class 331 subclass 46][List of Patents for class 331 subclass 46]46 PLURAL OSCILLATORS
 [List of Pre Grant Publications for class 331 subclass 47][List of Patents for class 331 subclass 47]47 Subclass 47 indent level is 1 Oscillator used to vary amplitude or frequency of another oscillator
 [List of Pre Grant Publications for class 331 subclass 48][List of Patents for class 331 subclass 48]48 Subclass 48 indent level is 1 Adjustable frequency
 [List of Pre Grant Publications for class 331 subclass 49][List of Patents for class 331 subclass 49]49 Subclass 49 indent level is 1 Selectively connected to common output or oscillator substitution
[List of Pre Grant Publications for class 331 subclass 50][List of Patents for class 331 subclass 50]50 Subclass 50 indent level is 1 Cascade or tandem connected
 [List of Pre Grant Publications for class 331 subclass 51][List of Patents for class 331 subclass 51]51 Subclass 51 indent level is 2 Frequency dividers
 [List of Pre Grant Publications for class 331 subclass 52][List of Patents for class 331 subclass 52]52 Subclass 52 indent level is 2 Semiconductor (e.g., transistor)
 [List of Pre Grant Publications for class 331 subclass 53][List of Patents for class 331 subclass 53]53 Subclass 53 indent level is 2 Frequency multiplier
 [List of Pre Grant Publications for class 331 subclass 54][List of Patents for class 331 subclass 54]54 Subclass 54 indent level is 2 Diverse-type oscillators
 [List of Pre Grant Publications for class 331 subclass 55][List of Patents for class 331 subclass 55]55 Subclass 55 indent level is 1 Synchronized, triggered or pulsed
 [List of Pre Grant Publications for class 331 subclass 56][List of Patents for class 331 subclass 56]56 Subclass 56 indent level is 1 Parallel connected
 [List of Pre Grant Publications for class 331 subclass 57][List of Patents for class 331 subclass 57]57 RING OSCILLATORS
 [List of Pre Grant Publications for class 331 subclass 58][List of Patents for class 331 subclass 58]58 PLURAL FUNCTIONS SIMULTANEOUSLY
 [List of Pre Grant Publications for class 331 subclass 59][List of Patents for class 331 subclass 59]59 CONVERTIBLE (E.G., OSCILLATOR TO AMPLIFIER, ETC.)
[List of Pre Grant Publications for class 331 subclass 60][List of Patents for class 331 subclass 60]60 SINGLE OSCILLATOR WITH PLURAL OUTPUT CIRCUITS
 [List of Pre Grant Publications for class 331 subclass 61][List of Patents for class 331 subclass 61]61 Subclass 61 indent level is 1 Plural outputs of diverse wave form
 [List of Pre Grant Publications for class 331 subclass 62][List of Patents for class 331 subclass 62]62 WITH OSCILLATOR CIRCUIT PROTECTIVE MEANS
 [List of Pre Grant Publications for class 331 subclass 63][List of Patents for class 331 subclass 63]63 PROTECTIVE OF SAFETY DEVICES FOR PERSONNEL
 [List of Pre Grant Publications for class 331 subclass 64][List of Patents for class 331 subclass 64]64 WITH INDICATOR, SIGNAL, OR ALARM
[List of Pre Grant Publications for class 331 subclass 65][List of Patents for class 331 subclass 65]65 WITH DEVICE RESPONSIVE TO EXTERNAL PHYSICAL CONDITION
 [List of Pre Grant Publications for class 331 subclass 66][List of Patents for class 331 subclass 66]66 Subclass 66 indent level is 1 Temperature or light responsive
 [List of Pre Grant Publications for class 331 subclass 67][List of Patents for class 331 subclass 67]67 WITH ELECTROMAGNETIC OR ELECTROSTATIC SHIELD
[List of Pre Grant Publications for class 331 subclass 68][List of Patents for class 331 subclass 68]68 WITH OUTER CASING OR HOUSING
 [List of Pre Grant Publications for class 331 subclass 69][List of Patents for class 331 subclass 69]69 Subclass 69 indent level is 1 With temperature modifier
 [List of Pre Grant Publications for class 331 subclass 70][List of Patents for class 331 subclass 70]70 WITH TEMPERATURE MODIFIER
 [List of Pre Grant Publications for class 331 subclass 71][List of Patents for class 331 subclass 71]71 RAW A.C. USED AS SOURCE OF POWER OR BIAS
[List of Pre Grant Publications for class 331 subclass 72][List of Patents for class 331 subclass 72]72 ELECTRON-COUPLED TYPE
 [List of Pre Grant Publications for class 331 subclass 73][List of Patents for class 331 subclass 73]73 Subclass 73 indent level is 1 Piezoelectric crystal resonator
[List of Pre Grant Publications for class 331 subclass 74][List of Patents for class 331 subclass 74]74 COMBINED WITH PARTICULAR OUTPUT COUPLING NETWORK
[List of Pre Grant Publications for class 331 subclass 75][List of Patents for class 331 subclass 75]75 Subclass 75 indent level is 1 Space discharge or unilaterally conductive device in output network
 [List of Pre Grant Publications for class 331 subclass 76][List of Patents for class 331 subclass 76]76 Subclass 76 indent level is 2 Harmonic producing or selecting network
 [List of Pre Grant Publications for class 331 subclass 77][List of Patents for class 331 subclass 77]77 Subclass 77 indent level is 1 Wave filter
 [List of Pre Grant Publications for class 331 subclass 78][List of Patents for class 331 subclass 78]78 ELECTRICAL NOISE OR RANDOM WAVE GENERATOR
[List of Pre Grant Publications for class 331 subclass 79][List of Patents for class 331 subclass 79]79 BEAM TUBE
 [List of Pre Grant Publications for class 331 subclass 80][List of Patents for class 331 subclass 80]80 Subclass 80 indent level is 1 With beam sweeping or deflecting means
[List of Pre Grant Publications for class 331 subclass 81][List of Patents for class 331 subclass 81]81 Subclass 81 indent level is 1 With electron bunching or velocity variation means
 [List of Pre Grant Publications for class 331 subclass 82][List of Patents for class 331 subclass 82]82 Subclass 82 indent level is 2 Traveling wave type
 [List of Pre Grant Publications for class 331 subclass 83][List of Patents for class 331 subclass 83]83 Subclass 83 indent level is 2 Multicavity type (e.g., Klystron)
 [List of Pre Grant Publications for class 331 subclass 84][List of Patents for class 331 subclass 84]84 Subclass 84 indent level is 2 Reflex type (i.e., with repeller electrode)
[List of Pre Grant Publications for class 331 subclass 86][List of Patents for class 331 subclass 86]86 WITH MAGNETICALLY CONTROLLED SPACE DISCHARGE DEVICE (E.G., MAGNETRON)
 [List of Pre Grant Publications for class 331 subclass 87][List of Patents for class 331 subclass 87]87 Subclass 87 indent level is 1 With particular pulsing means
 [List of Pre Grant Publications for class 331 subclass 88][List of Patents for class 331 subclass 88]88 Subclass 88 indent level is 1 With frequency stabilization
 [List of Pre Grant Publications for class 331 subclass 89][List of Patents for class 331 subclass 89]89 Subclass 89 indent level is 1 With secondary emissive electrode
 [List of Pre Grant Publications for class 331 subclass 90][List of Patents for class 331 subclass 90]90 Subclass 90 indent level is 1 With frequency adjustment
 [List of Pre Grant Publications for class 331 subclass 91][List of Patents for class 331 subclass 91]91 Subclass 91 indent level is 1 With undesired mode suppression or selection means
[List of Pre Grant Publications for class 331 subclass 92][List of Patents for class 331 subclass 92]92 RETARDING FIELD TUBE-TYPE OSCILLATORS (E.G., BARKHAUSEN KURZ)
 [List of Pre Grant Publications for class 331 subclass 93][List of Patents for class 331 subclass 93]93 Subclass 93 indent level is 1 With distributed parameter resonator
 [List of Pre Grant Publications for class 331 subclass 95][List of Patents for class 331 subclass 95]95 BUTTERFLY RESONATOR
[List of Pre Grant Publications for class 331 subclass 96][List of Patents for class 331 subclass 96]96 WITH DISTRIBUTED PARAMETER RESONATOR
[List of Pre Grant Publications for class 331 subclass 97][List of Patents for class 331 subclass 97]97 Subclass 97 indent level is 1 Tube enclosed by resonator structure
 [List of Pre Grant Publications for class 331 subclass 98][List of Patents for class 331 subclass 98]98 Subclass 98 indent level is 2 Disk seal tube (e.g., lighthouse, pencil tube)
[List of Pre Grant Publications for class 331 subclass 99][List of Patents for class 331 subclass 99]99 Subclass 99 indent level is 1 Parallel wire type
 [List of Pre Grant Publications for class 331 subclass 100][List of Patents for class 331 subclass 100]100 Subclass 100 indent level is 2 Push-pull type
[List of Pre Grant Publications for class 331 subclass 101][List of Patents for class 331 subclass 101]101 Subclass 101 indent level is 1 Coaxial or shielded line type
 [List of Pre Grant Publications for class 331 subclass 102][List of Patents for class 331 subclass 102]102 Subclass 102 indent level is 2 Push-pull type
 [List of Pre Grant Publications for class 331 subclass 103][List of Patents for class 331 subclass 103]103 TUBE STRUCTURE FORMS INDUCTIVE PART OF RESONANT CIRCUIT
 [List of Pre Grant Publications for class 331 subclass 104][List of Patents for class 331 subclass 104]104 TRANSIT TIME OSCILLATOR
 [List of Pre Grant Publications for class 331 subclass 105][List of Patents for class 331 subclass 105]105 WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS
 [List of Pre Grant Publications for class 331 subclass 106][List of Patents for class 331 subclass 106]106 WITH PERIODOIC OR REPETITIOUS AMPLITUDE VARYING MEANS (E.G., TREMOLO)
[List of Pre Grant Publications for class 331 subclass 107R][List of Patents for class 331 subclass 107R]  107R SOLID STATE ACTIVE ELEMENT OSCILLATOR
[List of Pre Grant Publications for class 331 subclass 108R][List of Patents for class 331 subclass 108R]  108R Subclass 108R indent level is 1 Transistors
 [List of Pre Grant Publications for class 331 subclass 109][List of Patents for class 331 subclass 109]109 Subclass 109 indent level is 2 Amplitude stabilization and control
 [List of Pre Grant Publications for class 331 subclass 110][List of Patents for class 331 subclass 110]110 Subclass 110 indent level is 2 Bridge type
[List of Pre Grant Publications for class 331 subclass 111][List of Patents for class 331 subclass 111]111 Subclass 111 indent level is 2 Relaxation oscillator
 [List of Pre Grant Publications for class 331 subclass 114][List of Patents for class 331 subclass 114]114 Subclass 114 indent level is 2 Push-pull
 [List of Pre Grant Publications for class 331 subclass 115][List of Patents for class 331 subclass 115]115 Subclass 115 indent level is 2 Negative resistance
[List of Pre Grant Publications for class 331 subclass 116R][List of Patents for class 331 subclass 116R]  116R Subclass 116R indent level is 2 Electromechanical resonator controlled
[List of Pre Grant Publications for class 331 subclass 117R][List of Patents for class 331 subclass 117R]  117R Subclass 117R indent level is 2 L-C type
 [List of Pre Grant Publications for class 331 subclass 108A][List of Patents for class 331 subclass 108A]108A Subclass 108A indent level is 2 Use of complimentary-type transistors
 [List of Pre Grant Publications for class 331 subclass 108B][List of Patents for class 331 subclass 108B]108B Subclass 108B indent level is 2 Phase shift oscillator
 [List of Pre Grant Publications for class 331 subclass 108C][List of Patents for class 331 subclass 108C]108C Subclass 108C indent level is 2 Integrated circuit oscillators
 [List of Pre Grant Publications for class 331 subclass 108D][List of Patents for class 331 subclass 108D]108D Subclass 108D indent level is 2 Integrated modules with discrete elements oscillators
[List of Pre Grant Publications for class 331 subclass 107DP][List of Patents for class 331 subclass 107DP]107DP Subclass 107DP indent level is 1 Significant distributed parameter resonator (e.g., cavity)
 [List of Pre Grant Publications for class 331 subclass 107P][List of Patents for class 331 subclass 107P]107P Subclass 107P indent level is 2 Parallel-connected oscillator devices
 [List of Pre Grant Publications for class 331 subclass 107SL][List of Patents for class 331 subclass 107SL]107SL Subclass 107SL indent level is 2 Stripline type
 [List of Pre Grant Publications for class 331 subclass 107C][List of Patents for class 331 subclass 107C]107C Subclass 107C indent level is 2 Coaxial type
 [List of Pre Grant Publications for class 331 subclass 107A][List of Patents for class 331 subclass 107A]107A Subclass 107A indent level is 1 Acoustoelectric device oscillators
 [List of Pre Grant Publications for class 331 subclass 107G][List of Patents for class 331 subclass 107G]107G Subclass 107G indent level is 1 Gunn-type bulk effect device oscillators
 [List of Pre Grant Publications for class 331 subclass 107S][List of Patents for class 331 subclass 107S]107S Subclass 107S indent level is 1 Superconductive device oscillators
 [List of Pre Grant Publications for class 331 subclass 107T][List of Patents for class 331 subclass 107T]107T Subclass 107T indent level is 1 Tunnel diode oscillators
[List of Pre Grant Publications for class 331 subclass 126][List of Patents for class 331 subclass 126]126 GASEOUS SPACE DISCHARGE DEVICE
 [List of Pre Grant Publications for class 331 subclass 127][List of Patents for class 331 subclass 127]127 Subclass 127 indent level is 1 Spark or open arc type
 [List of Pre Grant Publications for class 331 subclass 128][List of Patents for class 331 subclass 128]128 Subclass 128 indent level is 1 Drives shock excited L.C. circuit
[List of Pre Grant Publications for class 331 subclass 129][List of Patents for class 331 subclass 129]129 Subclass 129 indent level is 1 Relaxation oscillator
 [List of Pre Grant Publications for class 331 subclass 130][List of Patents for class 331 subclass 130]130 Subclass 130 indent level is 2 Plural gaseous devices
 [List of Pre Grant Publications for class 331 subclass 131][List of Patents for class 331 subclass 131]131 Subclass 131 indent level is 2 Discharge device or rectifier in "C" or "L" charging or discharging circuit
[List of Pre Grant Publications for class 331 subclass 132][List of Patents for class 331 subclass 132]132 NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR
 [List of Pre Grant Publications for class 331 subclass 133][List of Patents for class 331 subclass 133]133 Subclass 133 indent level is 1 Secondary emission (e.g., dynatron)
 [List of Pre Grant Publications for class 331 subclass 134][List of Patents for class 331 subclass 134]134 Subclass 134 indent level is 1 Transitron type
[List of Pre Grant Publications for class 331 subclass 135][List of Patents for class 331 subclass 135]135 PHASE SHIFT TYPE
 [List of Pre Grant Publications for class 331 subclass 136][List of Patents for class 331 subclass 136]136 Subclass 136 indent level is 1 Zero phase shift
 [List of Pre Grant Publications for class 331 subclass 137][List of Patents for class 331 subclass 137]137 Subclass 137 indent level is 1 With R.C. ladder-type phase shift network
[List of Pre Grant Publications for class 331 subclass 138][List of Patents for class 331 subclass 138]138 BRIDGE TYPE
 [List of Pre Grant Publications for class 331 subclass 139][List of Patents for class 331 subclass 139]139 Subclass 139 indent level is 1 Piezoelectric crystal in bridge
[List of Pre Grant Publications for class 331 subclass 140][List of Patents for class 331 subclass 140]140 Subclass 140 indent level is 1 R.C. or R.L. type
 [List of Pre Grant Publications for class 331 subclass 141][List of Patents for class 331 subclass 141]141 Subclass 141 indent level is 2 Wien bridge
 [List of Pre Grant Publications for class 331 subclass 142][List of Patents for class 331 subclass 142]142 Subclass 142 indent level is 2 Double T bridge
[List of Pre Grant Publications for class 331 subclass 143][List of Patents for class 331 subclass 143]143 RELAXATION OSCILLATORS
[List of Pre Grant Publications for class 331 subclass 144][List of Patents for class 331 subclass 144]144 Subclass 144 indent level is 1 Multivibrators
 [List of Pre Grant Publications for class 331 subclass 145][List of Patents for class 331 subclass 145]145 Subclass 145 indent level is 2 With sync, triggering or pulsing circuit
[List of Pre Grant Publications for class 331 subclass 146][List of Patents for class 331 subclass 146]146 Subclass 146 indent level is 1 Blocking oscillators
 [List of Pre Grant Publications for class 331 subclass 147][List of Patents for class 331 subclass 147]147 Subclass 147 indent level is 2 Using discharge device with plural grids
 [List of Pre Grant Publications for class 331 subclass 148][List of Patents for class 331 subclass 148]148 Subclass 148 indent level is 2 With 3 or more winding feedback transformers
 [List of Pre Grant Publications for class 331 subclass 149][List of Patents for class 331 subclass 149]149 Subclass 149 indent level is 2 With sync, trigger, or pulsing circuit (e.g., self-pulsing)
 [List of Pre Grant Publications for class 331 subclass 150][List of Patents for class 331 subclass 150]150 Subclass 150 indent level is 1 Output supplied to another discharge device circuit
 [List of Pre Grant Publications for class 331 subclass 151][List of Patents for class 331 subclass 151]151 Subclass 151 indent level is 1 Involving resonant or inductive wave forming circuit or transformer
 [List of Pre Grant Publications for class 331 subclass 152][List of Patents for class 331 subclass 152]152 Subclass 152 indent level is 1 Multi-grid discharge device in charged capacitor circuit
 [List of Pre Grant Publications for class 331 subclass 153][List of Patents for class 331 subclass 153]153 Subclass 153 indent level is 1 With sync, trigger or pulsing circuit
[List of Pre Grant Publications for class 331 subclass 154][List of Patents for class 331 subclass 154]154 ELECTROMECHANICAL RESONATOR
 [List of Pre Grant Publications for class 331 subclass 155][List of Patents for class 331 subclass 155]155 Subclass 155 indent level is 1 With optical, piezoelectric or acoustic coupling means
 [List of Pre Grant Publications for class 331 subclass 156][List of Patents for class 331 subclass 156]156 Subclass 156 indent level is 1 Vibrating reed or string type (e.g., tuning fork)
 [List of Pre Grant Publications for class 331 subclass 157][List of Patents for class 331 subclass 157]157 Subclass 157 indent level is 1 Magnetostrictive
[List of Pre Grant Publications for class 331 subclass 158][List of Patents for class 331 subclass 158]158 Subclass 158 indent level is 1 Crystal
 [List of Pre Grant Publications for class 331 subclass 159][List of Patents for class 331 subclass 159]159 Subclass 159 indent level is 2 Plural tube
 [List of Pre Grant Publications for class 331 subclass 160][List of Patents for class 331 subclass 160]160 Subclass 160 indent level is 2 With means to limit crystal current or voltage
 [List of Pre Grant Publications for class 331 subclass 161][List of Patents for class 331 subclass 161]161 Subclass 161 indent level is 2 With crystal substitution
 [List of Pre Grant Publications for class 331 subclass 162][List of Patents for class 331 subclass 162]162 Subclass 162 indent level is 2 Plural crystals in circuit
 [List of Pre Grant Publications for class 331 subclass 163][List of Patents for class 331 subclass 163]163 Subclass 163 indent level is 2 Crystal having three or more electrodes in circuit
 [List of Pre Grant Publications for class 331 subclass 164][List of Patents for class 331 subclass 164]164 Subclass 164 indent level is 2 Anode or cathode to grid crystal circuit
[List of Pre Grant Publications for class 331 subclass 165][List of Patents for class 331 subclass 165]165 SHOCK EXCITED RESONANT CIRCUIT
 [List of Pre Grant Publications for class 331 subclass 166][List of Patents for class 331 subclass 166]166 Subclass 166 indent level is 1 With keying means of the active element type (e.g., burst generator)
[List of Pre Grant Publications for class 331 subclass 167][List of Patents for class 331 subclass 167]167 L-C TYPE OSCILLATORS
 [List of Pre Grant Publications for class 331 subclass 168][List of Patents for class 331 subclass 168]168 Subclass 168 indent level is 1 Plural tubes
 [List of Pre Grant Publications for class 331 subclass 169][List of Patents for class 331 subclass 169]169 Subclass 169 indent level is 1 Anode to cathode coupled or connected resonant circuit
 [List of Pre Grant Publications for class 331 subclass 170][List of Patents for class 331 subclass 170]170 Subclass 170 indent level is 1 Anode to grid coupled or connected resonant circuit
 [List of Pre Grant Publications for class 331 subclass 171][List of Patents for class 331 subclass 171]171 Subclass 171 indent level is 1 Grid to cathode coupled or connected resonant circuit
[List of Pre Grant Publications for class 331 subclass 172][List of Patents for class 331 subclass 172]172 WITH SYNCHRONIZING, TRIGGERING OR PULSING CIRCUITS
[List of Pre Grant Publications for class 331 subclass 173][List of Patents for class 331 subclass 173]173 Subclass 173 indent level is 1 Triggering or pulsing (e.g., burst generators)
 [List of Pre Grant Publications for class 331 subclass 174][List of Patents for class 331 subclass 174]174 Subclass 174 indent level is 2 Self-quenched
[List of Pre Grant Publications for class 331 subclass 175][List of Patents for class 331 subclass 175]175 FREQUENCY STABILIZATION
 [List of Pre Grant Publications for class 331 subclass 176][List of Patents for class 331 subclass 176]176 Subclass 176 indent level is 1 Temperature or current responsive means in circuit
[List of Pre Grant Publications for class 331 subclass 177R][List of Patents for class 331 subclass 177R]  177R WITH FREQUENCY ADJUSTING MEANS
 [List of Pre Grant Publications for class 331 subclass 178][List of Patents for class 331 subclass 178]178 Subclass 178 indent level is 1 Cyclic frequency sweeping means (e.g., vibrato)
 [List of Pre Grant Publications for class 331 subclass 179][List of Patents for class 331 subclass 179]179 Subclass 179 indent level is 1 Step-frequency change (e.g., band selection, frequency-shift keying)
 [List of Pre Grant Publications for class 331 subclass 180][List of Patents for class 331 subclass 180]180 Subclass 180 indent level is 1 Reactance tube type
 [List of Pre Grant Publications for class 331 subclass 181][List of Patents for class 331 subclass 181]181 Subclass 181 indent level is 1 Variable inductance device (e.g., saturable core or adjustable vane inductor)
 [List of Pre Grant Publications for class 331 subclass 177V][List of Patents for class 331 subclass 177V]177V Subclass 177V indent level is 1 With voltage sensitive capacitor
[List of Pre Grant Publications for class 331 subclass 182][List of Patents for class 331 subclass 182]182 AMPLITUDE CONTROL OR STABILIZATION
 [List of Pre Grant Publications for class 331 subclass 183][List of Patents for class 331 subclass 183]183 Subclass 183 indent level is 1 Automatic
 [List of Pre Grant Publications for class 331 subclass 184][List of Patents for class 331 subclass 184]184 HAVING DISCHARGED DEVICE OR PARTICULAR CONSTRUCTION
[List of Pre Grant Publications for class 331 subclass 185][List of Patents for class 331 subclass 185]185 WITH PARTICULAR SOURCE OF POWER OR BIAS VOLTAGE
 [List of Pre Grant Publications for class 331 subclass 186][List of Patents for class 331 subclass 186]186 Subclass 186 indent level is 1 Regulated
 [List of Pre Grant Publications for class 331 subclass 187][List of Patents for class 331 subclass 187]187 MISCELLANEOUS OSCILLATOR STRUCTURES
 
FOREIGN ART COLLECTIONS
 
      FOR000          CLASS-RELATED FOREIGN DOCUMENTS
 
DIGESTS
 
 [List of Pre Grant Publications for class 331 subclass DIG2][List of Patents for class 331 subclass DIG2] DIG2 PHASE LOCKED LOOP HAVING LOCK INDICATING OR DETECTING MEANS
 [List of Pre Grant Publications for class 331 subclass DIG3][List of Patents for class 331 subclass DIG3] DIG3 LOGIC GATE ACTIVE ELEMENT OSCILLATOR

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