| Class Number |
Class Name |
Patents |
| 331/103 |
Tube structure forms inductive part of resonant circuit |
4 |
| 331/104 |
Transit time oscillator |
4 |
| 331/105 |
With parasitic oscillation control or prevention means |
43 |
| 331/106 |
With periodoic or repetitious amplitude varying means (e.g., tremolo) |
5 |
| 331/107R |
Solid state active element oscillator |
119 |
| 331/126 |
Gaseous space discharge device |
4 |
| 331/132 |
Negative resistance or negative transconductance oscillator |
32 |
| 331/135 |
Phase shift type |
155 |
| 331/138 |
Bridge type |
11 |
| 331/143 |
Relaxation oscillators |
332 |
| 331/154 |
Electromechanical resonator |
80 |
| 331/165 |
Shock excited resonant circuit |
18 |
| 331/167 |
L-c type oscillators |
276 |
| 331/172 |
With synchronizing, triggering or pulsing circuits |
116 |
| 331/175 |
Frequency stabilization |
423 |
| 331/177R |
With frequency adjusting means |
777 |
| 331/182 |
Amplitude control or stabilization |
55 |
| 331/184 |
Having discharged device or particular construction |
9 |
| 331/185 |
With particular source of power or bias voltage |
268 |
| 331/187 |
Miscellaneous oscillator structures |
29 |
| 331/1R |
Automatic frequency stabilization using a phase or frequency sensing means |
217 |
| 331/37 |
Beat frequency |
49 |
| 331/44 |
With frequency calibration or testing |
243 |
| 331/45 |
Polyphase output |
210 |
| 331/46 |
Plural oscillators |
214 |
| 331/57 |
Ring oscillators |
1,073 |
| 331/58 |
Plural functions simultaneously |
4 |
| 331/59 |
Convertible (e.g., oscillator to amplifier, etc.) |
24 |
| 331/60 |
Single oscillator with plural output circuits |
90 |
| 331/62 |
With oscillator circuit protective means |
18 |
| 331/63 |
Protective of safety devices for personnel |
3 |
| 331/64 |
With indicator, signal, or alarm |
67 |
| 331/65 |
With device responsive to external physical condition |
369 |
| 331/67 |
With electromagnetic or electrostatic shield |
36 |
| 331/68 |
With outer casing or housing |
149 |
| 331/70 |
With temperature modifier |
34 |
| 331/71 |
Raw a.c. used as source of power or bias |
5 |
| 331/72 |
Electron-coupled type |
0 |
| 331/74 |
Combined with particular output coupling network |
453 |
| 331/78 |
Electrical noise or random wave generator |
263 |
| 331/79 |
Beam tube |
36 |
| 331/86 |
With magnetically controlled space discharge device (e.g., magnetron) |
38 |
| 331/92 |
Retarding field tube-type oscillators (e.g., barkhausen kurz) |
0 |
| 331/94.1 |
Molecular or particle resonant type (e.g., maser) |
131 |
| 331/95 |
Butterfly resonator |
0 |
| 331/96 |
With distributed parameter resonator |
407 |
| 331/DIG.2 |
Phase locked loop having lock indicating or detecting means |
455 |
| 331/DIG.3 |
Logic gate active element oscillator |
115 |
