US Patent Class 331
OSCILLATORS-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
94.1  DF  MOLECULAR OR PARTICLE RESONANT TYPE (E.G., MASER)
1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS {16}
37  DF  BEAT FREQUENCY {4}
44  DF  WITH FREQUENCY CALIBRATION OR TESTING
45  DF  POLYPHASE OUTPUT
46  DF  PLURAL OSCILLATORS {6}
57  DF  RING OSCILLATORS
58  DF  PLURAL FUNCTIONS SIMULTANEOUSLY
59  DF  CONVERTIBLE (E.G., OSCILLATOR TO AMPLIFIER, ETC.)
60  DF  SINGLE OSCILLATOR WITH PLURAL OUTPUT CIRCUITS {1}
62  DF  WITH OSCILLATOR CIRCUIT PROTECTIVE MEANS
63  DF  PROTECTIVE OF SAFETY DEVICES FOR PERSONNEL
64  DF  WITH INDICATOR, SIGNAL, OR ALARM
65  DF  WITH DEVICE RESPONSIVE TO EXTERNAL PHYSICAL CONDITION {1}
67  DF  WITH ELECTROMAGNETIC OR ELECTROSTATIC SHIELD
68  DF  WITH OUTER CASING OR HOUSING {1}
70  DF  WITH TEMPERATURE MODIFIER
71  DF  RAW A.C. USED AS SOURCE OF POWER OR BIAS
72  DF  ELECTRON-COUPLED TYPE {1}
74  DF  COMBINED WITH PARTICULAR OUTPUT COUPLING NETWORK {2}
78  DF  ELECTRICAL NOISE OR RANDOM WAVE GENERATOR
79  DF  BEAM TUBE {2}
86  DF  WITH MAGNETICALLY CONTROLLED SPACE DISCHARGE DEVICE (E.G., MAGNETRON) {5}
92  DF  RETARDING FIELD TUBE-TYPE OSCILLATORS (E.G., BARKHAUSEN KURZ) {1}
95  DF  BUTTERFLY RESONATOR
96  DF  WITH DISTRIBUTED PARAMETER RESONATOR {3}
103  DF  TUBE STRUCTURE FORMS INDUCTIVE PART OF RESONANT CIRCUIT
104  DF  TRANSIT TIME OSCILLATOR
105  DF  WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS
106  DF  WITH PERIODOIC OR REPETITIOUS AMPLITUDE VARYING MEANS (E.G., TREMOLO)
107 R  DF  SOLID STATE ACTIVE ELEMENT OSCILLATOR {6}
126  DF  GASEOUS SPACE DISCHARGE DEVICE {3}
132  DF  NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR {2}
135  DF  PHASE SHIFT TYPE {2}
138  DF  BRIDGE TYPE {2}
143  DF  RELAXATION OSCILLATORS {6}
154  DF  ELECTROMECHANICAL RESONATOR {4}
165  DF  SHOCK EXCITED RESONANT CIRCUIT {1}
167  DF  L-C TYPE OSCILLATORS {4}
172  DF  WITH SYNCHRONIZING, TRIGGERING OR PULSING CIRCUITS {1}
175  DF  FREQUENCY STABILIZATION {1}
177 R  DF  WITH FREQUENCY ADJUSTING MEANS {5}
182  DF  AMPLITUDE CONTROL OR STABILIZATION {1}
184  DF  HAVING DISCHARGED DEVICE OR PARTICULAR CONSTRUCTION
185  DF  WITH PARTICULAR SOURCE OF POWER OR BIAS VOLTAGE {1}
187  DF  MISCELLANEOUS OSCILLATOR STRUCTURES
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DIGESTS
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DIG 2  DF  Phase locked loop having lock indicating or detecting means
DIG 3  DF  Logic gate active element oscillator