Subclasses list

• 94.1 MOLECULAR OR PARTICLE RESONANT TYPE (E.G., MASER) 
  Patents: 159
  Patent Applications: 56
• 1R AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS 
  Patents: 281
  Patent Applications: 38
• 2 Plural oscillators controlled 
  Patents: 746
  Patent Applications: 64
• 3 Molecular resonance stabilization 
  Patents: 148
  Patent Applications: 14
• 4 Search sweep of oscillator 
  Patents: 252
  Patent Applications: 3
• 5 Magnetron oscillator 
  Patents: 10
  Patent Applications: 2
• 6 Klystron oscillator 
  Patents: 4
  Patent Applications: 1
• 7 Plural controls 
  Patents: 5
  Patent Applications: 1
• 8 Transistorized controls 
  Patents: 348
  Patent Applications: 15
• 9 Oscillator with distributed parameter-type discriminator 
  Patents: 45
  Patent Applications: 1
• 10 Plural A.F.S. for a single oscillator 
  Patents: 368
  Patent Applications: 38
• 11 Plural comparators or discriminators 
  Patents: 700
  Patent Applications: 11
• 12 With phase-shifted inputs 
  Patents: 167
  Patent Applications: 7
• 13 Motor control of oscillator 
  Patents: 0
  Patent Applications: 1
• 14 With intermittent comparison controls 
  Patents: 593
  Patent Applications: 2
• 15 Amplitude compensation 
  Patents: 67
  Patent Applications: 17
• 16 Tuning compensation 
  Patents: 1289
  Patent Applications: 431
• 17 Particular error voltage control (e.g., intergrating network) 
  Patents: 2128
  Patent Applications: 127
• 18 With reference oscillator or source 
  Patents: 533
  Patent Applications: 67
• 19 Spectrum reference source 
  Patents: 62
  Patent Applications: 1
• 20 T.V. sync type 
  Patents: 155
  Patent Applications: 1
• 21 Lock to power line 
  Patents: 10
  Patent Applications: 0
• 22 Plural significant heterodyne stages 
  Patents: 43
  Patent Applications: 2
• 23 Sensing modulation (e.g., frequency modulation controlled oscillator 
  Patents: 236
  Patent Applications: 7
• 24 With motor comparator 
  Patents: 1
  Patent Applications: 0
• 25 Signal or phase comparator 
  Patents: 2064
  Patent Applications: 68
• 26 Plural diode type 
  Patents: 9
  Patent Applications: 0
• 27 Plural active element (e.g., triodes) 
  Patents: 183
  Patent Applications: 1
• 28 Unilateral element (e.g., diode) 
  Patents: 2
  Patent Applications: 0
• 29 Electromechanical 
  Patents: 0
  Patent Applications: 0
• 30 With stable heterodyne oscillator or source 
  Patents: 23
  Patent Applications: 0
• 31 Plural significant heterodyne stages 
  Patents: 25
  Patent Applications: 0
• 32 With particular discriminator (e.g., LPF and HPF) 
  Patents: 15
  Patent Applications: 0
• 33 Plural diode type 
  Patents: 1
  Patent Applications: 0
• 34 Particular frequency control means 
  Patents: 672
  Patent Applications: 102
• 35 Electromechanical (e.g., motor) 
  Patents: 15
  Patent Applications: 3
• 36R Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.) 
  Patents: 31
  Patent Applications: 4
• 36C Capacitor controlled AFC 
  Patents: 424
  Patent Applications: 76
• 36L Inductor controlled AFC 
  Patents: 42
  Patent Applications: 7
• 1A AFC with logic elements 
  Patents: 1969
  Patent Applications: 130
• 37 BEAT FREQUENCY 
  Patents: 73
  Patent Applications: 6
• 38 Plural beating 
  Patents: 50
  Patent Applications: 3
• 39 Single channel 
  Patents: 19
  Patent Applications: 0
• 40 Frequency or amplitude adjustment or control 
  Patents: 67
  Patent Applications: 7
• 41 Frequency stabilization 
  Patents: 31
  Patent Applications: 0
• 42 With particular signal combining means (e.g., cavity mixer) 
  Patents: 24
  Patent Applications: 2
• 43 With filter in mixer output circuit 
  Patents: 18
  Patent Applications: 1
• 44 WITH FREQUENCY CALIBRATION OR TESTING 
  Patents: 318
  Patent Applications: 50
• 45 POLYPHASE OUTPUT 
  Patents: 264
  Patent Applications: 33
• 46 PLURAL OSCILLATORS 
  Patents: 277
  Patent Applications: 42
• 47 Oscillator used to vary amplitude or frequency of another oscillator 
  Patents: 116
  Patent Applications: 7
• 48 Adjustable frequency 
  Patents: 90
  Patent Applications: 14
• 49 Selectively connected to common output or oscillator substitution 
  Patents: 280
  Patent Applications: 11
• 50 Cascade or tandem connected 
  Patents: 36
  Patent Applications: 6
• 51 Frequency dividers 
  Patents: 48
  Patent Applications: 1
• 52 Semiconductor (e.g., transistor) 
  Patents: 11
  Patent Applications: 1
• 53 Frequency multiplier 
  Patents: 27
  Patent Applications: 1
• 54 Diverse-type oscillators 
  Patents: 5
  Patent Applications: 0
• 55 Synchronized, triggered or pulsed 
  Patents: 128
  Patent Applications: 10
• 56 Parallel connected 
  Patents: 182
  Patent Applications: 8
• 57 RING OSCILLATORS 
  Patents: 1446
  Patent Applications: 296
• 58 PLURAL FUNCTIONS SIMULTANEOUSLY 
  Patents: 5
  Patent Applications: 0
• 59 CONVERTIBLE (E.G., OSCILLATOR TO AMPLIFIER, ETC.) 
  Patents: 29
  Patent Applications: 1
• 60 SINGLE OSCILLATOR WITH PLURAL OUTPUT CIRCUITS 
  Patents: 98
  Patent Applications: 6
• 61 Plural outputs of diverse wave form 
  Patents: 16
  Patent Applications: 2
• 62 WITH OSCILLATOR CIRCUIT PROTECTIVE MEANS 
  Patents: 23
  Patent Applications: 2
• 63 PROTECTIVE OF SAFETY DEVICES FOR PERSONNEL 
  Patents: 3
  Patent Applications: 0
• 64 WITH INDICATOR, SIGNAL, OR ALARM 
  Patents: 73
  Patent Applications: 3
• 65 WITH DEVICE RESPONSIVE TO EXTERNAL PHYSICAL CONDITION 
  Patents: 416
  Patent Applications: 14
• 66 Temperature or light responsive 
  Patents: 307
  Patent Applications: 31
• 67 WITH ELECTROMAGNETIC OR ELECTROSTATIC SHIELD 
  Patents: 42
  Patent Applications: 2
• 68 WITH OUTER CASING OR HOUSING 
  Patents: 203
  Patent Applications: 36
• 69 With temperature modifier 
  Patents: 97
  Patent Applications: 13
• 70 WITH TEMPERATURE MODIFIER 
  Patents: 37
  Patent Applications: 20
• 71 RAW A.C. USED AS SOURCE OF POWER OR BIAS 
  Patents: 5
  Patent Applications: 1
• 72 ELECTRON-COUPLED TYPE 
  Patents: 0
  Patent Applications: 0
• 73 Piezoelectric crystal resonator 
  Patents: 11
  Patent Applications: 2
• 74 COMBINED WITH PARTICULAR OUTPUT COUPLING NETWORK 
  Patents: 511
  Patent Applications: 53
• 75 Space discharge or unilaterally conductive device in output network 
  Patents: 106
  Patent Applications: 3
• 76 Harmonic producing or selecting network 
  Patents: 93
  Patent Applications: 4
• 77 Wave filter 
  Patents: 67
  Patent Applications: 2
• 78 ELECTRICAL NOISE OR RANDOM WAVE GENERATOR 
  Patents: 347
  Patent Applications: 17
• 79 BEAM TUBE 
  Patents: 36
  Patent Applications: 4
• 80 With beam sweeping or deflecting means 
  Patents: 1
  Patent Applications: 0
• 81 With electron bunching or velocity variation means 
  Patents: 19
  Patent Applications: 1
• 82 Traveling wave type 
  Patents: 31
  Patent Applications: 1
• 83 Multicavity type (e.g., Klystron) 
  Patents: 20
  Patent Applications: 4
• 84 Reflex type (i.e., with repeller electrode) 
  Patents: 4
  Patent Applications: 1
• 86 WITH MAGNETICALLY CONTROLLED SPACE DISCHARGE DEVICE (E.G., MAGNETRON) 
  Patents: 38
  Patent Applications: 3
• 87 With particular pulsing means 
  Patents: 28
  Patent Applications: 1
• 88 With frequency stabilization 
  Patents: 16
  Patent Applications: 0
• 89 With secondary emissive electrode 
  Patents: 3
  Patent Applications: 0
• 90 With frequency adjustment 
  Patents: 36
  Patent Applications: 0
• 91 With undesired mode suppression or selection means 
  Patents: 23
  Patent Applications: 0
• 92 RETARDING FIELD TUBE-TYPE OSCILLATORS (E.G., BARKHAUSEN KURZ) 
  Patents: 0
  Patent Applications: 0
• 93 With distributed parameter resonator 
  Patents: 1
  Patent Applications: 0
• 95 BUTTERFLY RESONATOR 
  Patents: 0
  Patent Applications: 0
• 96 WITH DISTRIBUTED PARAMETER RESONATOR 
  Patents: 463
  Patent Applications: 11
• 97 Tube enclosed by resonator structure 
  Patents: 12
  Patent Applications: 0
• 98 Disk seal tube (e.g., lighthouse, pencil tube) 
  Patents: 3
  Patent Applications: 0
• 99 Parallel wire type 
  Patents: 172
  Patent Applications: 1
• 100 Push-pull type 
  Patents: 49
  Patent Applications: 0
• 101 Coaxial or shielded line type 
  Patents: 63
  Patent Applications: 1
• 102 Push-pull type 
  Patents: 7
  Patent Applications: 0
• 103 TUBE STRUCTURE FORMS INDUCTIVE PART OF RESONANT CIRCUIT 
  Patents: 3
  Patent Applications: 1
• 104 TRANSIT TIME OSCILLATOR 
  Patents: 4
  Patent Applications: 0
• 105 WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS 
  Patents: 46
  Patent Applications: 0
• 106 WITH PERIODOIC OR REPETITIOUS AMPLITUDE VARYING MEANS (E.G., TREMOLO) 
  Patents: 5
  Patent Applications: 1
• 107R SOLID STATE ACTIVE ELEMENT OSCILLATOR 
  Patents: 126
  Patent Applications: 8
• 108R Transistors 
  Patents: 63
  Patent Applications: 39
• 109 Amplitude stabilization and control 
  Patents: 178
  Patent Applications: 21
• 110 Bridge type 
  Patents: 25
  Patent Applications: 0
• 111 Relaxation oscillator 
  Patents: 535
  Patent Applications: 31
• 112 Blocking oscillator type 
  Patents: 56
  Patent Applications: 0
• 113R Multivibrator type 
  Patents: 190
  Patent Applications: 3
• 113A Saturable core controlled converters 
  Patents: 102
  Patent Applications: 0
• 113S Converter using silicon control rectifiers 
  Patents: 3
  Patent Applications: 0
• 114 Push-pull 
  Patents: 49
  Patent Applications: 0
• 115 Negative resistance 
  Patents: 67
  Patent Applications: 15
• 116R Electromechanical resonator controlled 
  Patents: 483
  Patent Applications: 34
• 116FE Field-effect transistor active element 
  Patents: 379
  Patent Applications: 22
• 116M Electromechanical resonators other than piezoelectric crystals 
  Patents: 68
  Patent Applications: 7
• 117R L-C type 
  Patents: 806
  Patent Applications: 55
• 117FE Field-effect transistor active element 
  Patents: 429
  Patent Applications: 123
• 117D Distributed parameter resonator transistor oscillators 
  Patents: 378
  Patent Applications: 2
• 108A Use of complimentary-type transistors 
  Patents: 45
  Patent Applications: 8
• 108B Phase shift oscillator 
  Patents: 120
  Patent Applications: 1
• 108C Integrated circuit oscillators 
  Patents: 213
  Patent Applications: 16
• 108D Integrated modules with discrete elements oscillators 
  Patents: 195
  Patent Applications: 2
• 107DP Significant distributed parameter resonator (e.g., cavity) 
  Patents: 212
  Patent Applications: 13
• 107P Parallel-connected oscillator devices 
  Patents: 55
  Patent Applications: 0
• 107SL Stripline type 
  Patents: 193
  Patent Applications: 22
• 107C Coaxial type 
  Patents: 27
  Patent Applications: 0
• 107A Acoustoelectric device oscillators 
  Patents: 189
  Patent Applications: 23
• 107G Gunn-type bulk effect device oscillators 
  Patents: 93
  Patent Applications: 4
• 107S Superconductive device oscillators 
  Patents: 31
  Patent Applications: 0
• 107T Tunnel diode oscillators 
  Patents: 22
  Patent Applications: 11
• 126 GASEOUS SPACE DISCHARGE DEVICE 
  Patents: 5
  Patent Applications: 1
• 127 Spark or open arc type 
  Patents: 11
  Patent Applications: 2
• 128 Drives shock excited L.C. circuit 
  Patents: 4
  Patent Applications: 0
• 129 Relaxation oscillator 
  Patents: 4
  Patent Applications: 0
• 130 Plural gaseous devices 
  Patents: 2
  Patent Applications: 0
• 131 Discharge device or rectifier in "C" or "L" charging or discharging circuit 
  Patents: 0
  Patent Applications: 1
• 132 NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR 
  Patents: 38
  Patent Applications: 5
• 133 Secondary emission (e.g., dynatron) 
  Patents: 2
  Patent Applications: 0
• 134 Transitron type 
  Patents: 1
  Patent Applications: 0
• 135 PHASE SHIFT TYPE 
  Patents: 193
  Patent Applications: 18
• 136 Zero phase shift 
  Patents: 8
  Patent Applications: 0
• 137 With R.C. ladder-type phase shift network 
  Patents: 14
  Patent Applications: 1
• 138 BRIDGE TYPE 
  Patents: 11
  Patent Applications: 0
• 139 Piezoelectric crystal in bridge 
  Patents: 12
  Patent Applications: 1
• 140 R.C. or R.L. type 
  Patents: 11
  Patent Applications: 3
• 141 Wien bridge 
  Patents: 11
  Patent Applications: 0
• 142 Double T bridge 
  Patents: 4
  Patent Applications: 0
• 143 RELAXATION OSCILLATORS 
  Patents: 356
  Patent Applications: 16
• 144 Multivibrators 
  Patents: 49
  Patent Applications: 2
• 145 With sync, triggering or pulsing circuit 
  Patents: 18
  Patent Applications: 1
• 146 Blocking oscillators 
  Patents: 3
  Patent Applications: 0
• 147 Using discharge device with plural grids 
  Patents: 1
  Patent Applications: 0
• 148 With 3 or more winding feedback transformers 
  Patents: 1
  Patent Applications: 0
• 149 With sync, trigger, or pulsing circuit (e.g., self-pulsing) 
  Patents: 6
  Patent Applications: 0
• 150 Output supplied to another discharge device circuit 
  Patents: 10
  Patent Applications: 1
• 151 Involving resonant or inductive wave forming circuit or transformer 
  Patents: 13
  Patent Applications: 1
• 152 Multi-grid discharge device in charged capacitor circuit 
  Patents: 0
  Patent Applications: 1
• 153 With sync, trigger or pulsing circuit 
  Patents: 34
  Patent Applications: 2
• 154 ELECTROMECHANICAL RESONATOR 
  Patents: 110
  Patent Applications: 67
• 155 With optical, piezoelectric or acoustic coupling means 
  Patents: 37
  Patent Applications: 17
• 156 Vibrating reed or string type (e.g., tuning fork) 
  Patents: 85
  Patent Applications: 39
• 157 Magnetostrictive 
  Patents: 7
  Patent Applications: 4
• 158 Crystal 
  Patents: 848
  Patent Applications: 247
• 159 Plural tube 
  Patents: 15
  Patent Applications: 0
• 160 With means to limit crystal current or voltage 
  Patents: 47
  Patent Applications: 6
• 161 With crystal substitution 
  Patents: 13
  Patent Applications: 0
• 162 Plural crystals in circuit 
  Patents: 32
  Patent Applications: 1
• 163 Crystal having three or more electrodes in circuit 
  Patents: 23
  Patent Applications: 3
• 164 Anode or cathode to grid crystal circuit 
  Patents: 0
  Patent Applications: 0
• 165 SHOCK EXCITED RESONANT CIRCUIT 
  Patents: 23
  Patent Applications: 1
• 166 With keying means of the active element type (e.g., burst generator) 
  Patents: 19
  Patent Applications: 0
• 167 L-C TYPE OSCILLATORS 
  Patents: 299
  Patent Applications: 97
• 168 Plural tubes 
  Patents: 10
  Patent Applications: 0
• 169 Anode to cathode coupled or connected resonant circuit 
  Patents: 4
  Patent Applications: 1
• 170 Anode to grid coupled or connected resonant circuit 
  Patents: 6
  Patent Applications: 0
• 171 Grid to cathode coupled or connected resonant circuit 
  Patents: 2
  Patent Applications: 0
• 172 WITH SYNCHRONIZING, TRIGGERING OR PULSING CIRCUITS 
  Patents: 119
  Patent Applications: 8
• 173 Triggering or pulsing (e.g., burst generators) 
  Patents: 192
  Patent Applications: 5
• 174 Self-quenched 
  Patents: 6
  Patent Applications: 0
• 175 FREQUENCY STABILIZATION 
  Patents: 434
  Patent Applications: 26
• 176 Temperature or current responsive means in circuit 
  Patents: 734
  Patent Applications: 102
• 177R WITH FREQUENCY ADJUSTING MEANS 
  Patents: 761
  Patent Applications: 30
• 178 Cyclic frequency sweeping means (e.g., vibrato) 
  Patents: 73
  Patent Applications: 0
• 179 Step-frequency change (e.g., band selection, frequency-shift keying) 
  Patents: 553
  Patent Applications: 39
• 180 Reactance tube type 
  Patents: 3
  Patent Applications: 0
• 181 Variable inductance device (e.g., saturable core or adjustable vane inductor) 
  Patents: 71
  Patent Applications: 11
• 177V With voltage sensitive capacitor 
  Patents: 831
  Patent Applications: 74
• 182 AMPLITUDE CONTROL OR STABILIZATION 
  Patents: 52
  Patent Applications: 12
• 183 Automatic 
  Patents: 216
  Patent Applications: 17
• 184 HAVING DISCHARGED DEVICE OR PARTICULAR CONSTRUCTION 
  Patents: 9
  Patent Applications: 1
• 185 WITH PARTICULAR SOURCE OF POWER OR BIAS VOLTAGE 
  Patents: 283
  Patent Applications: 57
• 186 Regulated 
  Patents: 182
  Patent Applications: 13
• 187 MISCELLANEOUS OSCILLATOR STRUCTURES 
  Patents: 28
  Patent Applications: 3