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Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 331 | OSCILLATORS |
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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 |
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