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Class Information
Number: 331
Name: Oscillators >
Description: This is the generic class for electrical oscillators.










Class Number Class Name No. of Patents
331/182

Amplitude control or stabilization

93
331/183

Automatic

285
331/1R

Automatic frequency stabilization using a phase or frequency sensing means

287
331/1A

Afc with logic elements

1649
331/15

Amplitude compensation

68
331/6

Klystron oscillator

6
331/7

Plural controls

8
331/5

Magnetron oscillator

13
331/3

Molecular resonance stabilization

169
331/9

Oscillator with distributed parameter-type discriminator

37
331/17

Particular error voltage control (e.g., intergrating network)

1934
331/34

Particular frequency control means

808
331/35

Electromechanical (e.g., motor)

8
331/36R

Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.)

45
331/36C

Capacitor controlled afc

513
331/36L

Inductor controlled afc

58
331/10

Plural a.f.s. for a single oscillator

278
331/13

Motor control of oscillator

3
331/11

Plural comparators or discriminators

521
331/12

With phase-shifted inputs

133
331/2

Plural oscillators controlled

610
331/4

Search sweep of oscillator

186
331/8

Transistorized controls

309
331/16

Tuning compensation

1354
331/14

With intermittent comparison controls

503
331/18

With reference oscillator or source

515
331/22

Plural significant heterodyne stages

46
331/23

Sensing modulation (e.g., frequency modulation controlled oscillator

255
331/24

With motor comparator

1
331/25

Signal or phase comparator

2047
331/29

Electromechanical

0
331/27

Plural active element (e.g., triodes)

179
331/26

Plural diode type

9
331/28

Unilateral element (e.g., diode)

3
331/19

Spectrum reference source

53
331/20

T.v. sync type

151
331/21

Lock to power line

10
331/30

With stable heterodyne oscillator or source

29
331/31

Plural significant heterodyne stages

26
331/32

With particular discriminator (e.g., lpf and hpf)

17
331/33

Plural diode type

1
331/79

Beam tube

37
331/80

With beam sweeping or deflecting means

2
331/81

With electron bunching or velocity variation means

11
331/83

Multicavity type (e.g., klystron)

24
331/84

Reflex type (i.e., with repeller electrode)

3
331/82

Traveling wave type

40
331/37

Beat frequency

71
331/40

Frequency or amplitude adjustment or control

83
331/41

Frequency stabilization

45
331/38

Plural beating

49
331/39

Single channel

28
331/42

With particular signal combining means (e.g., cavity mixer)

38
331/43

With filter in mixer output circuit

25
331/138

Bridge type

12
331/139

Piezoelectric crystal in bridge

11
331/140

R.c. or r.l. type

12
331/142

Double t bridge

3
331/141

Wien bridge

11
331/95

Butterfly resonator

0
331/74

Combined with particular output coupling network

541
331/75

Space discharge or unilaterally conductive device in output network

82
331/76

Harmonic producing or selecting network

78
331/77

Wave filter

73
331/59

Convertible (e.g., oscillator to amplifier, etc.)

30
331/78

Electrical noise or random wave generator

311
331/154

Electromechanical resonator

222
331/158

Crystal

994
331/164

Anode or cathode to grid crystal circuit

0
331/163

Crystal having three or more electrodes in circuit

23
331/162

Plural crystals in circuit

46
331/159

Plural tube

19
331/161

With crystal substitution

18
331/160

With means to limit crystal current or voltage

72
331/157

Magnetostrictive

8
331/156

Vibrating reed or string type (e.g., tuning fork)

132
331/155

With optical, piezoelectric or acoustic coupling means

54
331/72

Electron-coupled type

0
331/73

Piezoelectric crystal resonator

16
331/175

Frequency stabilization

515
331/176

Temperature or current responsive means in circuit

817
331/126

Gaseous space discharge device

5
331/128

Drives shock excited l.c. circuit

4
331/129

Relaxation oscillator

6
331/131

Discharge device or rectifier in "c" or "l" charging or discharging circuit

1
331/130

Plural gaseous devices

1
331/127

Spark or open arc type

11
331/184

Having discharged device or particular construction

10
331/167

L-c type oscillators

420
331/169

Anode to cathode coupled or connected resonant circuit

2
331/170

Anode to grid coupled or connected resonant circuit

2
331/171

Grid to cathode coupled or connected resonant circuit

2
331/168

Plural tubes

11
331/DIG.3

Logic gate active element oscillator

116
331/187

Miscellaneous oscillator structures

47
331/94.1

Molecular or particle resonant type (e.g., maser)

203
331/132

Negative resistance or negative transconductance oscillator

40
331/133

Secondary emission (e.g., dynatron)

1
331/134

Transitron type

1
331/DIG.2

Phase locked loop having lock indicating or detecting means

472
331/135

Phase shift type

186
331/137

With r.c. ladder-type phase shift network

18
331/136

Zero phase shift

7
331/58

Plural functions simultaneously

4
331/46

Plural oscillators

335
331/48

Adjustable frequency

107
331/50

Cascade or tandem connected

62
331/54

Diverse-type oscillators

7
331/51

Frequency dividers

55
331/53

Frequency multiplier

34
331/52

Semiconductor (e.g., transistor)

11
331/47

Oscillator used to vary amplitude or frequency of another oscillator

137
331/56

Parallel connected

199
331/49

Selectively connected to common output or oscillator substitution

276
331/55

Synchronized, triggered or pulsed

173
331/45

Polyphase output

284
331/63

Protective of safety devices for personnel

3
331/71

Raw a.c. used as source of power or bias

5
331/143

Relaxation oscillators

416
331/146

Blocking oscillators

3
331/147

Using discharge device with plural grids

1
331/148

With 3 or more winding feedback transformers

1
331/149

With sync, trigger, or pulsing circuit (e.g., self-pulsing)

8
331/151

Involving resonant or inductive wave forming circuit or transformer

16
331/152

Multi-grid discharge device in charged capacitor circuit

0
331/144

Multivibrators

52
331/145

With sync, triggering or pulsing circuit

23
331/150

Output supplied to another discharge device circuit

14
331/153

With sync, trigger or pulsing circuit

39
331/92

Retarding field tube-type oscillators (e.g., barkhausen kurz)

0
331/93

With distributed parameter resonator

1
331/57

Ring oscillators

1367
331/165

Shock excited resonant circuit

24
331/166

With keying means of the active element type (e.g., burst generator)

19
331/60

Single oscillator with plural output circuits

107
331/61

Plural outputs of diverse wave form

12
331/107R

Solid state active element oscillator

142
331/107A

Acoustoelectric device oscillators

192
331/107G

Gunn-type bulk effect device oscillators

89
331/107DP

Significant distributed parameter resonator (e.g., cavity)

227
331/107C

Coaxial type

27
331/107P

Parallel-connected oscillator devices

58
331/107SL

Stripline type

220
331/107S

Superconductive device oscillators

30
331/108R

Transistors

78
331/109

Amplitude stabilization and control

174
331/110

Bridge type

16
331/116R

Electromechanical resonator controlled

560
331/116M

Electromechanical resonators other than piezoelectric crystals

121
331/116FE

Field-effect transistor active element

435
331/108C

Integrated circuit oscillators

227
331/108D

Integrated modules with discrete elements oscillators

202
331/117R

L-c type

845
331/117D

Distributed parameter resonator transistor oscillators

377
331/117FE

Field-effect transistor active element

576
331/115

Negative resistance

74
331/108B

Phase shift oscillator

116
331/114

Push-pull

51
331/111

Relaxation oscillator

522
331/112

Blocking oscillator type

57
331/113R

Multivibrator type

179
331/113S

Converter using silicon control rectifiers

3
331/113A

Saturable core controlled converters

95
331/108A

Use of complimentary-type transistors

47
331/107T

Tunnel diode oscillators

27
331/104

Transit time oscillator

4
331/103

Tube structure forms inductive part of resonant circuit

5
331/65

With device responsive to external physical condition

394
331/66

Temperature or light responsive

350
331/96

With distributed parameter resonator

463
331/101

Coaxial or shielded line type

62
331/102

Push-pull type

7
331/99

Parallel wire type

145
331/100

Push-pull type

27
331/97

Tube enclosed by resonator structure

11
331/98

Disk seal tube (e.g., lighthouse, pencil tube)

1
331/67

With electromagnetic or electrostatic shield

37
331/177R

With frequency adjusting means

923
331/178

Cyclic frequency sweeping means (e.g., vibrato)

72
331/180

Reactance tube type

2
331/179

Step-frequency change (e.g., band selection, frequency-shift keying)

640
331/181

Variable inductance device (e.g., saturable core or adjustable vane inductor)

85
331/177V

With voltage sensitive capacitor

939
331/44

With frequency calibration or testing

376
331/64

With indicator, signal, or alarm

72
331/86

With magnetically controlled space discharge device (e.g., magnetron)

41
331/90

With frequency adjustment

38
331/88

With frequency stabilization

16
331/87

With particular pulsing means

26
331/89

With secondary emissive electrode

3
331/91

With undesired mode suppression or selection means

21
331/62

With oscillator circuit protective means

22
331/68

With outer casing or housing

220
331/69

With temperature modifier

95
331/105

With parasitic oscillation control or prevention means

46
331/185

With particular source of power or bias voltage

409
331/186

Regulated

240
331/106

With periodoic or repetitious amplitude varying means (e.g., tremolo)

7
331/172

With synchronizing, triggering or pulsing circuits

154
331/173

Triggering or pulsing (e.g., burst generators)

218
331/174

Self-quenched

8
331/70

With temperature modifier

56
 
 
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