| Class 331 | OSCILLATORS |
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![[List of Pre Grant Publications for class 331 subclass 94.1]](../as.gif) | ![[List of Patents for class 331 subclass 94.1]](../ps.gif) | 94.1 | MOLECULAR OR PARTICLE RESONANT TYPE (E.G., MASER) |
| | 1R | AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS |
| | 2 |  Plural oscillators controlled |
| | 3 | Molecular resonance stabilization |
| | 4 | Search sweep of oscillator |
| | 5 | Magnetron oscillator |
| | 6 | Klystron oscillator |
| | 8 | Transistorized controls |
| | 9 | Oscillator with distributed parameter-type discriminator |
| | 10 | Plural A.F.S. for a single oscillator |
| | 14 | With intermittent comparison controls |
| | 15 | Amplitude compensation |
| | 16 | Tuning compensation |
| | 17 | Particular error voltage control (e.g., intergrating network) |
| | 18 | With reference oscillator or source |
| | 19 |  Spectrum reference source |
| | 20 | T.V. sync type |
| | 22 | Plural significant heterodyne stages |
| | 23 | Sensing modulation (e.g., frequency modulation controlled oscillator |
| | 25 | Signal or phase comparator |
| | 30 | With stable heterodyne oscillator or source |
| | 34 | Particular frequency control means |
| | 35 | Electromechanical (e.g., motor) |
| | 36R | Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.) |
| | 1A | AFC with logic elements |
| | 37 | BEAT FREQUENCY |
| | 38 | Plural beating |
| | 40 | Frequency or amplitude adjustment or control |
| | 41 | Frequency stabilization |
| | 42 | With particular signal combining means (e.g., cavity mixer) |
| | 44 | WITH FREQUENCY CALIBRATION OR TESTING |
| | 45 | POLYPHASE OUTPUT |
| | 46 | PLURAL OSCILLATORS |
| | 47 | Oscillator used to vary amplitude or frequency of another oscillator |
| | 48 | Adjustable frequency |
| | 49 | Selectively connected to common output or oscillator substitution |
| | 50 | Cascade or tandem connected |
| | 51 | Frequency dividers |
| | 52 | Semiconductor (e.g., transistor) |
| | 53 | Frequency multiplier |
| | 54 | Diverse-type oscillators |
| | 55 | Synchronized, triggered or pulsed |
| | 56 | Parallel connected |
| | 57 | RING OSCILLATORS |
| | 58 | PLURAL FUNCTIONS SIMULTANEOUSLY |
| | 59 | CONVERTIBLE (E.G., OSCILLATOR TO AMPLIFIER, ETC.) |
| | 60 | SINGLE OSCILLATOR WITH PLURAL OUTPUT CIRCUITS |
| | 62 | WITH OSCILLATOR CIRCUIT PROTECTIVE MEANS |
| | 63 | PROTECTIVE OF SAFETY DEVICES FOR PERSONNEL |
| | 64 | WITH INDICATOR, SIGNAL, OR ALARM |
| | 65 | WITH DEVICE RESPONSIVE TO EXTERNAL PHYSICAL CONDITION |
| | 67 | WITH ELECTROMAGNETIC OR ELECTROSTATIC SHIELD |
| | 68 | WITH OUTER CASING OR HOUSING |
| | 70 | WITH TEMPERATURE MODIFIER |
| | 71 | RAW A.C. USED AS SOURCE OF POWER OR BIAS |
| | 72 | ELECTRON-COUPLED TYPE |
| | 74 | COMBINED WITH PARTICULAR OUTPUT COUPLING NETWORK |
| | 78 | ELECTRICAL NOISE OR RANDOM WAVE GENERATOR |
| | 79 | BEAM TUBE |
| | 86 | WITH MAGNETICALLY CONTROLLED SPACE DISCHARGE DEVICE (E.G., MAGNETRON) |
| | 87 | With particular pulsing means |
| | 88 | With frequency stabilization |
| | 89 | With secondary emissive electrode |
| | 90 | With frequency adjustment |
| | 91 | With undesired mode suppression or selection means |
| | 92 | RETARDING FIELD TUBE-TYPE OSCILLATORS (E.G., BARKHAUSEN KURZ) |
| | 95 | BUTTERFLY RESONATOR |
| | 96 | WITH DISTRIBUTED PARAMETER RESONATOR |
| | 103 | TUBE STRUCTURE FORMS INDUCTIVE PART OF RESONANT CIRCUIT |
| | 104 | TRANSIT TIME OSCILLATOR |
| | 105 | WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS |
| | 106 | WITH PERIODOIC OR REPETITIOUS AMPLITUDE VARYING MEANS (E.G., TREMOLO) |
| | 107R | SOLID STATE ACTIVE ELEMENT OSCILLATOR |
| | 108R | Transistors |
| | 109 | Amplitude stabilization and control |
| | 110 | Bridge type |
| | 111 | Relaxation oscillator |
| | 114 | Push-pull |
| | 115 | Negative resistance |
| | 116R | Electromechanical resonator controlled |
| | 116FE |  Field-effect transistor active element |
| | 116M | Electromechanical resonators other than piezoelectric crystals |
| | 117R | L-C type |
| | 117FE | Field-effect transistor active element |
| | 117D | Distributed parameter resonator transistor oscillators |
| | 108A | Use of complimentary-type transistors |
| | 108B | Phase shift oscillator |
| | 108C | Integrated circuit oscillators |
| | 108D | Integrated modules with discrete elements oscillators |
| | 107DP | Significant distributed parameter resonator (e.g., cavity) |
| | 107A | Acoustoelectric device oscillators |
| | 107G | Gunn-type bulk effect device oscillators |
| | 107S | Superconductive device oscillators |
| | 107T | Tunnel diode oscillators |
| | 126 | GASEOUS SPACE DISCHARGE DEVICE |
| | 132 | NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR |
| | 135 | PHASE SHIFT TYPE |
| | 138 | BRIDGE TYPE |
| | 143 | RELAXATION OSCILLATORS |
| | 144 | Multivibrators |
| | 146 | Blocking oscillators |
| | 147 | Using discharge device with plural grids |
| | 148 | With 3 or more winding feedback transformers |
| | 149 | With sync, trigger, or pulsing circuit (e.g., self-pulsing) |
| | 150 | Output supplied to another discharge device circuit |
| | 151 | Involving resonant or inductive wave forming circuit or transformer |
| | 152 | Multi-grid discharge device in charged capacitor circuit |
| | 153 | With sync, trigger or pulsing circuit |
| | 154 | ELECTROMECHANICAL RESONATOR |
| | 155 | With optical, piezoelectric or acoustic coupling means |
| | 156 | Vibrating reed or string type (e.g., tuning fork) |
| | 157 | Magnetostrictive |
| | 158 | Crystal |
| | 165 | SHOCK EXCITED RESONANT CIRCUIT |
| | 167 | L-C TYPE OSCILLATORS |
| | 168 | Plural tubes |
| | 169 | Anode to cathode coupled or connected resonant circuit |
| | 170 | Anode to grid coupled or connected resonant circuit |
| | 171 | Grid to cathode coupled or connected resonant circuit |
| | 172 | WITH SYNCHRONIZING, TRIGGERING OR PULSING CIRCUITS |
| | 175 | FREQUENCY STABILIZATION |
| | 177R | WITH FREQUENCY ADJUSTING MEANS |
| | 178 | Cyclic frequency sweeping means (e.g., vibrato) |
| | 179 | Step-frequency change (e.g., band selection, frequency-shift keying) |
| | 180 | Reactance tube type |
| | 181 | Variable inductance device (e.g., saturable core or adjustable vane inductor) |
| | 177V | With voltage sensitive capacitor |
| | 182 | AMPLITUDE CONTROL OR STABILIZATION |
| | 184 | HAVING DISCHARGED DEVICE OR PARTICULAR CONSTRUCTION |
| | 185 | WITH PARTICULAR SOURCE OF POWER OR BIAS VOLTAGE |
| | 187 | MISCELLANEOUS OSCILLATOR STRUCTURES |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
| DIGESTS | ||
| | DIG2 | PHASE LOCKED LOOP HAVING LOCK INDICATING OR DETECTING MEANS |
| | DIG3 | LOGIC GATE ACTIVE ELEMENT OSCILLATOR |