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Classification Resources
 
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 37][List of Patents for class 331 subclass 37]37 BEAT FREQUENCY
 [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 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 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 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 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 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 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 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 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 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 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 126][List of Patents for class 331 subclass 126]126 GASEOUS SPACE DISCHARGE DEVICE
[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 135][List of Patents for class 331 subclass 135]135 PHASE SHIFT TYPE
[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 143][List of Patents for class 331 subclass 143]143 RELAXATION OSCILLATORS
[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 165][List of Patents for class 331 subclass 165]165 SHOCK EXCITED RESONANT CIRCUIT
[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 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 175][List of Patents for class 331 subclass 175]175 FREQUENCY STABILIZATION
[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 182][List of Patents for class 331 subclass 182]182 AMPLITUDE CONTROL OR STABILIZATION
 [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 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