Oscillators Patents (Class 331)
Molecular or particle resonant type (e.g., maser) (Class 331/94.1)
Automatic frequency stabilization using a phase or frequency sensing means (Class 331/1R)
Beat frequency (Class 331/37)
With frequency calibration or testing (Class 331/44)
Polyphase output (Class 331/45)
Plural oscillators (Class 331/46)
Ring oscillators (Class 331/57)
Plural functions simultaneously (Class 331/58)
Convertible (e.g., oscillator to amplifier, etc.) (Class 331/59)
Single oscillator with plural output circuits (Class 331/60)
With oscillator circuit protective means (Class 331/62)
Protective of safety devices for personnel (Class 331/63)
With indicator, signal, or alarm (Class 331/64)
With device responsive to external physical condition (Class 331/65)
With electromagnetic or electrostatic shield (Class 331/67)
With outer casing or housing (Class 331/68)
With temperature modifier (Class 331/70)
Raw a.c. used as source of power or bias (Class 331/71)
Electron-coupled type (Class 331/72)
Combined with particular output coupling network (Class 331/74)
Electrical noise or random wave generator (Class 331/78)
Beam tube (Class 331/79)
With magnetically controlled space discharge device (e.g., magnetron) (Class 331/86)
Retarding field tube-type oscillators (e.g., barkhausen kurz) (Class 331/92)
Butterfly resonator (Class 331/95)
With distributed parameter resonator (Class 331/96)
Tube structure forms inductive part of resonant circuit (Class 331/103)
Transit time oscillator (Class 331/104)
With parasitic oscillation control or prevention means (Class 331/105)
With periodoic or repetitious amplitude varying means (e.g., tremolo) (Class 331/106)
Solid state active element oscillator (Class 331/107R)
Gaseous space discharge device (Class 331/126)
Negative resistance or negative transconductance oscillator (Class 331/132)
Phase shift type (Class 331/135)
Bridge type (Class 331/138)
Relaxation oscillators (Class 331/143)
Electromechanical resonator (Class 331/154)
Shock excited resonant circuit (Class 331/165)
L-c type oscillators (Class 331/167)
With synchronizing, triggering or pulsing circuits (Class 331/172)
Frequency stabilization (Class 331/175)
With frequency adjusting means (Class 331/177R)
Amplitude control or stabilization (Class 331/182)
Having discharged device or particular construction (Class 331/184)
With particular source of power or bias voltage (Class 331/185)
Miscellaneous oscillator structures (Class 331/187)

Foreign Patent Art Collections

Class-related foreign documents (Class 331/FOR000)

Digests

Phase locked loop having lock indicating or detecting means (Class 331/DIG2)
Logic gate active element oscillator (Class 331/DIG3)