| Class Number |
Class Name |
Patents |
| 331/103 |
Tube structure forms inductive part of resonant circuit |
3 |
| 331/104 |
Transit time oscillator |
4 |
| 331/105 |
With parasitic oscillation control or prevention means |
40 |
| 331/106 |
With periodoic or repetitious amplitude varying means (e.g., tremolo) |
5 |
| 331/107R |
Solid state active element oscillator |
118 |
| 331/126 |
Gaseous space discharge device |
2 |
| 331/132 |
Negative resistance or negative transconductance oscillator |
31 |
| 331/135 |
Phase shift type |
152 |
| 331/138 |
Bridge type |
10 |
| 331/143 |
Relaxation oscillators |
311 |
| 331/154 |
Electromechanical resonator |
70 |
| 331/165 |
Shock excited resonant circuit |
17 |
| 331/167 |
L-c type oscillators |
231 |
| 331/172 |
With synchronizing, triggering or pulsing circuits |
111 |
| 331/175 |
Frequency stabilization |
403 |
| 331/177R |
With frequency adjusting means |
739 |
| 331/182 |
Amplitude control or stabilization |
47 |
| 331/184 |
Having discharged device or particular construction |
9 |
| 331/185 |
With particular source of power or bias voltage |
232 |
| 331/187 |
Miscellaneous oscillator structures |
26 |
| 331/1R |
Automatic frequency stabilization using a phase or frequency sensing means |
210 |
| 331/37 |
Beat frequency |
45 |
| 331/44 |
With frequency calibration or testing |
218 |
| 331/45 |
Polyphase output |
186 |
| 331/46 |
Plural oscillators |
196 |
| 331/57 |
Ring oscillators |
1,003 |
| 331/58 |
Plural functions simultaneously |
4 |
| 331/59 |
Convertible (e.g., oscillator to amplifier, etc.) |
21 |
| 331/60 |
Single oscillator with plural output circuits |
86 |
| 331/62 |
With oscillator circuit protective means |
17 |
| 331/63 |
Protective of safety devices for personnel |
3 |
| 331/64 |
With indicator, signal, or alarm |
66 |
| 331/65 |
With device responsive to external physical condition |
364 |
| 331/67 |
With electromagnetic or electrostatic shield |
34 |
| 331/68 |
With outer casing or housing |
138 |
| 331/70 |
With temperature modifier |
31 |
| 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 |
425 |
| 331/78 |
Electrical noise or random wave generator |
251 |
| 331/79 |
Beam tube |
35 |
| 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) |
127 |
| 331/95 |
Butterfly resonator |
0 |
| 331/96 |
With distributed parameter resonator |
393 |
| 331/DIG.2 |
Phase locked loop having lock indicating or detecting means |
449 |
| 331/DIG.3 |
Logic gate active element oscillator |
114 |
