| Class Number |
Class Name |
No. of Patents |
| 331/182 |
Amplitude control or stabilization |
55 |
| 331/183 |
Automatic |
201 |
| 331/1R |
Automatic frequency stabilization using a phase or frequency sensing means |
217 |
| 331/1A |
Afc with logic elements |
1448 |
| 331/15 |
Amplitude compensation |
56 |
| 331/6 |
Klystron oscillator |
4 |
| 331/7 |
Plural controls |
5 |
| 331/5 |
Magnetron oscillator |
9 |
| 331/3 |
Molecular resonance stabilization |
117 |
| 331/9 |
Oscillator with distributed parameter-type discriminator |
36 |
| 331/17 |
Particular error voltage control (e.g., intergrating network) |
1652 |
| 331/34 |
Particular frequency control means |
579 |
| 331/35 |
Electromechanical (e.g., motor) |
5 |
| 331/36R |
Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.) |
31 |
| 331/36C |
Capacitor controlled afc |
404 |
| 331/36L |
Inductor controlled afc |
34 |
| 331/10 |
Plural a.f.s. for a single oscillator |
242 |
| 331/13 |
Motor control of oscillator |
1 |
| 331/11 |
Plural comparators or discriminators |
444 |
| 331/12 |
With phase-shifted inputs |
126 |
| 331/2 |
Plural oscillators controlled |
491 |
| 331/4 |
Search sweep of oscillator |
179 |
| 331/8 |
Transistorized controls |
290 |
| 331/16 |
Tuning compensation |
1003 |
| 331/14 |
With intermittent comparison controls |
460 |
| 331/18 |
With reference oscillator or source |
418 |
| 331/22 |
Plural significant heterodyne stages |
42 |
| 331/23 |
Sensing modulation (e.g., frequency modulation controlled oscillator |
233 |
| 331/24 |
With motor comparator |
1 |
| 331/25 |
Signal or phase comparator |
1847 |
| 331/29 |
Electromechanical |
0 |
| 331/27 |
Plural active element (e.g., triodes) |
176 |
| 331/26 |
Plural diode type |
8 |
| 331/28 |
Unilateral element (e.g., diode) |
3 |
| 331/19 |
Spectrum reference source |
51 |
| 331/20 |
T.v. sync type |
147 |
| 331/21 |
Lock to power line |
10 |
| 331/30 |
With stable heterodyne oscillator or source |
26 |
| 331/31 |
Plural significant heterodyne stages |
25 |
| 331/32 |
With particular discriminator (e.g., lpf and hpf) |
15 |
| 331/33 |
Plural diode type |
1 |
| 331/79 |
Beam tube |
36 |
| 331/80 |
With beam sweeping or deflecting means |
1 |
| 331/81 |
With electron bunching or velocity variation means |
7 |
| 331/83 |
Multicavity type (e.g., klystron) |
21 |
| 331/84 |
Reflex type (i.e., with repeller electrode) |
3 |
| 331/82 |
Traveling wave type |
31 |
| 331/37 |
Beat frequency |
49 |
| 331/40 |
Frequency or amplitude adjustment or control |
61 |
| 331/41 |
Frequency stabilization |
31 |
| 331/38 |
Plural beating |
38 |
| 331/39 |
Single channel |
19 |
| 331/42 |
With particular signal combining means (e.g., cavity mixer) |
23 |
| 331/43 |
With filter in mixer output circuit |
19 |
| 331/138 |
Bridge type |
11 |
| 331/139 |
Piezoelectric crystal in bridge |
8 |
| 331/140 |
R.c. or r.l. type |
11 |
| 331/142 |
Double t bridge |
3 |
| 331/141 |
Wien bridge |
11 |
| 331/95 |
Butterfly resonator |
0 |
| 331/74 |
Combined with particular output coupling network |
451 |
| 331/75 |
Space discharge or unilaterally conductive device in output network |
79 |
| 331/76 |
Harmonic producing or selecting network |
68 |
| 331/77 |
Wave filter |
67 |
| 331/59 |
Convertible (e.g., oscillator to amplifier, etc.) |
23 |
| 331/78 |
Electrical noise or random wave generator |
263 |
| 331/154 |
Electromechanical resonator |
80 |
| 331/158 |
Crystal |
739 |
| 331/164 |
Anode or cathode to grid crystal circuit |
0 |
| 331/163 |
Crystal having three or more electrodes in circuit |
21 |
| 331/162 |
Plural crystals in circuit |
32 |
| 331/159 |
Plural tube |
15 |
| 331/161 |
With crystal substitution |
13 |
| 331/160 |
With means to limit crystal current or voltage |
40 |
| 331/157 |
Magnetostrictive |
6 |
| 331/156 |
Vibrating reed or string type (e.g., tuning fork) |
68 |
| 331/155 |
With optical, piezoelectric or acoustic coupling means |
35 |
| 331/72 |
Electron-coupled type |
0 |
| 331/73 |
Piezoelectric crystal resonator |
12 |
| 331/175 |
Frequency stabilization |
423 |
| 331/176 |
Temperature or current responsive means in circuit |
595 |
| 331/126 |
Gaseous space discharge device |
3 |
| 331/128 |
Drives shock excited l.c. circuit |
4 |
| 331/129 |
Relaxation oscillator |
4 |
| 331/131 |
Discharge device or rectifier in "c" or "l" charging or discharging circuit |
0 |
| 331/130 |
Plural gaseous devices |
1 |
| 331/127 |
Spark or open arc type |
10 |
| 331/184 |
Having discharged device or particular construction |
9 |
| 331/167 |
L-c type oscillators |
274 |
| 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 |
9 |
| 331/DIG.3 |
Logic gate active element oscillator |
115 |
| 331/187 |
Miscellaneous oscillator structures |
29 |
| 331/94.1 |
Molecular or particle resonant type (e.g., maser) |
131 |
| 331/132 |
Negative resistance or negative transconductance oscillator |
32 |
| 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 |
455 |
| 331/135 |
Phase shift type |
154 |
| 331/137 |
With r.c. ladder-type phase shift network |
14 |
| 331/136 |
Zero phase shift |
7 |
| 331/58 |
Plural functions simultaneously |
4 |
| 331/46 |
Plural oscillators |
214 |
| 331/48 |
Adjustable frequency |
77 |
| 331/50 |
Cascade or tandem connected |
37 |
| 331/54 |
Diverse-type oscillators |
7 |
| 331/51 |
Frequency dividers |
44 |
| 331/53 |
Frequency multiplier |
25 |
| 331/52 |
Semiconductor (e.g., transistor) |
10 |
| 331/47 |
Oscillator used to vary amplitude or frequency of another oscillator |
104 |
| 331/56 |
Parallel connected |
166 |
| 331/49 |
Selectively connected to common output or oscillator substitution |
233 |
| 331/55 |
Synchronized, triggered or pulsed |
119 |
| 331/45 |
Polyphase output |
209 |
| 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 |
332 |
| 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) |
6 |
| 331/151 |
Involving resonant or inductive wave forming circuit or transformer |
12 |
| 331/152 |
Multi-grid discharge device in charged capacitor circuit |
0 |
| 331/144 |
Multivibrators |
50 |
| 331/145 |
With sync, triggering or pulsing circuit |
18 |
| 331/150 |
Output supplied to another discharge device circuit |
11 |
| 331/153 |
With sync, trigger or pulsing circuit |
31 |
| 331/92 |
Retarding field tube-type oscillators (e.g., barkhausen kurz) |
0 |
| 331/93 |
With distributed parameter resonator |
1 |
| 331/57 |
Ring oscillators |
1071 |
| 331/165 |
Shock excited resonant circuit |
18 |
| 331/166 |
With keying means of the active element type (e.g., burst generator) |
16 |
| 331/60 |
Single oscillator with plural output circuits |
89 |
| 331/61 |
Plural outputs of diverse wave form |
11 |
| 331/107R |
Solid state active element oscillator |
118 |
| 331/107A |
Acoustoelectric device oscillators |
159 |
| 331/107G |
Gunn-type bulk effect device oscillators |
86 |
| 331/107DP |
Significant distributed parameter resonator (e.g., cavity) |
206 |
| 331/107C |
Coaxial type |
26 |
| 331/107P |
Parallel-connected oscillator devices |
56 |
| 331/107SL |
Stripline type |
186 |
| 331/107S |
Superconductive device oscillators |
28 |
| 331/108R |
Transistors |
60 |
| 331/109 |
Amplitude stabilization and control |
133 |
| 331/110 |
Bridge type |
16 |
| 331/116R |
Electromechanical resonator controlled |
434 |
| 331/116M |
Electromechanical resonators other than piezoelectric crystals |
55 |
| 331/116FE |
Field-effect transistor active element |
345 |
| 331/108C |
Integrated circuit oscillators |
178 |
| 331/108D |
Integrated modules with discrete elements oscillators |
182 |
| 331/117R |
L-c type |
691 |
| 331/117D |
Distributed parameter resonator transistor oscillators |
356 |
| 331/117FE |
Field-effect transistor active element |
409 |
| 331/115 |
Negative resistance |
66 |
| 331/108B |
Phase shift oscillator |
101 |
| 331/114 |
Push-pull |
47 |
| 331/111 |
Relaxation oscillator |
446 |
| 331/112 |
Blocking oscillator type |
56 |
| 331/113R |
Multivibrator type |
171 |
| 331/113S |
Converter using silicon control rectifiers |
3 |
| 331/113A |
Saturable core controlled converters |
94 |
| 331/108A |
Use of complimentary-type transistors |
44 |
| 331/107T |
Tunnel diode oscillators |
15 |
| 331/104 |
Transit time oscillator |
4 |
| 331/103 |
Tube structure forms inductive part of resonant circuit |
4 |
| 331/65 |
With device responsive to external physical condition |
368 |
| 331/66 |
Temperature or light responsive |
287 |
| 331/96 |
With distributed parameter resonator |
404 |
| 331/101 |
Coaxial or shielded line type |
60 |
| 331/102 |
Push-pull type |
7 |
| 331/99 |
Parallel wire type |
135 |
| 331/100 |
Push-pull type |
21 |
| 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 |
36 |
| 331/177R |
With frequency adjusting means |
776 |
| 331/178 |
Cyclic frequency sweeping means (e.g., vibrato) |
69 |
| 331/180 |
Reactance tube type |
2 |
| 331/179 |
Step-frequency change (e.g., band selection, frequency-shift keying) |
502 |
| 331/181 |
Variable inductance device (e.g., saturable core or adjustable vane inductor) |
60 |
| 331/177V |
With voltage sensitive capacitor |
783 |
| 331/44 |
With frequency calibration or testing |
242 |
| 331/64 |
With indicator, signal, or alarm |
67 |
| 331/86 |
With magnetically controlled space discharge device (e.g., magnetron) |
38 |
| 331/90 |
With frequency adjustment |
37 |
| 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 |
18 |
| 331/68 |
With outer casing or housing |
149 |
| 331/69 |
With temperature modifier |
67 |
| 331/105 |
With parasitic oscillation control or prevention means |
42 |
| 331/185 |
With particular source of power or bias voltage |
268 |
| 331/186 |
Regulated |
168 |
| 331/106 |
With periodoic or repetitious amplitude varying means (e.g., tremolo) |
5 |
| 331/172 |
With synchronizing, triggering or pulsing circuits |
116 |
| 331/173 |
Triggering or pulsing (e.g., burst generators) |
178 |
| 331/174 |
Self-quenched |
7 |
| 331/70 |
With temperature modifier |
34 |
