USPC Patent Classifications

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Class 331 oscillators
uspcdescription
331/94.1331 oscillators/(94.1) molecular or particle resonant type (e.g., maser)
331/1R331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means
331/2331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (2) plural oscillators controlled
331/3331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (3) molecular resonance stabilization
331/4331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (4) search sweep of oscillator
331/5331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (5) magnetron oscillator
331/6331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (6) klystron oscillator
331/7331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (6) klystron oscillator (7) plural controls
331/8331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (8) transistorized controls
331/9331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (9) oscillator with distributed parameter-type discriminator
331/10331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (10) plural a.f.s. for a single oscillator
331/11331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (10) plural a.f.s. for a single oscillator (11) plural comparators or discriminators
331/12331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (10) plural a.f.s. for a single oscillator (11) plural comparators or discriminators (12) with phase-shifted inputs
331/13331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (10) plural a.f.s. for a single oscillator (13) motor control of oscillator
331/14331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (14) with intermittent comparison controls
331/15331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (15) amplitude compensation
331/16331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (16) tuning compensation
331/17331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (17) particular error voltage control (e.g., intergrating network)
331/18331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source
331/19331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (19) spectrum reference source
331/20331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (20) t.v. sync type
331/21331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (20) t.v. sync type (21) lock to power line
331/22331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (22) plural significant heterodyne stages
331/23331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (23) sensing modulation (e.g., frequency modulation controlled oscillator
331/24331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (23) sensing modulation (e.g., frequency modulation controlled oscillator (24) with motor comparator
331/25331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (25) signal or phase comparator
331/26331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (25) signal or phase comparator (26) plural diode type
331/27331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (25) signal or phase comparator (27) plural active element (e.g., triodes)
331/28331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (25) signal or phase comparator (28) unilateral element (e.g., diode)
331/29331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (18) with reference oscillator or source (25) signal or phase comparator (29) electromechanical
331/30331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (30) with stable heterodyne oscillator or source
331/31331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (30) with stable heterodyne oscillator or source (31) plural significant heterodyne stages
331/32331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (30) with stable heterodyne oscillator or source (32) with particular discriminator (e.g., lpf and hpf)
331/33331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (30) with stable heterodyne oscillator or source (32) with particular discriminator (e.g., lpf and hpf) (33) plural diode type
331/34331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (34) particular frequency control means
331/35331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (34) particular frequency control means (35) electromechanical (e.g., motor)
331/36R331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (34) particular frequency control means (36r) reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.)
331/36C331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (34) particular frequency control means (36r) reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.) (36c) capacitor controlled afc
331/36L331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (34) particular frequency control means (36r) reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.) (36l) inductor controlled afc
331/1A331 oscillators/(1r) automatic frequency stabilization using a phase or frequency sensing means (1a) afc with logic elements
331/37331 oscillators/(37) beat frequency
331/38331 oscillators/(37) beat frequency (38) plural beating
331/39331 oscillators/(37) beat frequency (38) plural beating (39) single channel
331/40331 oscillators/(37) beat frequency (40) frequency or amplitude adjustment or control
331/41331 oscillators/(37) beat frequency (41) frequency stabilization
331/42331 oscillators/(37) beat frequency (42) with particular signal combining means (e.g., cavity mixer)
331/43331 oscillators/(37) beat frequency (42) with particular signal combining means (e.g., cavity mixer) (43) with filter in mixer output circuit
331/44331 oscillators/(44) with frequency calibration or testing
331/45331 oscillators/(45) polyphase output
331/46331 oscillators/(46) plural oscillators
331/47331 oscillators/(46) plural oscillators (47) oscillator used to vary amplitude or frequency of another oscillator
331/48331 oscillators/(46) plural oscillators (48) adjustable frequency
331/49331 oscillators/(46) plural oscillators (49) selectively connected to common output or oscillator substitution
331/50331 oscillators/(46) plural oscillators (50) cascade or tandem connected
331/51331 oscillators/(46) plural oscillators (50) cascade or tandem connected (51) frequency dividers
331/52331 oscillators/(46) plural oscillators (50) cascade or tandem connected (52) semiconductor (e.g., transistor)
331/53331 oscillators/(46) plural oscillators (50) cascade or tandem connected (53) frequency multiplier
331/54331 oscillators/(46) plural oscillators (50) cascade or tandem connected (54) diverse-type oscillators
331/55331 oscillators/(46) plural oscillators (55) synchronized, triggered or pulsed
331/56331 oscillators/(46) plural oscillators (56) parallel connected
331/57331 oscillators/(57) ring oscillators
331/58331 oscillators/(58) plural functions simultaneously
331/59331 oscillators/(59) convertible (e.g., oscillator to amplifier, etc.)
331/60331 oscillators/(60) single oscillator with plural output circuits
331/61331 oscillators/(60) single oscillator with plural output circuits (61) plural outputs of diverse wave form
331/62331 oscillators/(62) with oscillator circuit protective means
331/63331 oscillators/(63) protective of safety devices for personnel
331/64331 oscillators/(64) with indicator, signal, or alarm
331/65331 oscillators/(65) with device responsive to external physical condition
331/66331 oscillators/(65) with device responsive to external physical condition (66) temperature or light responsive
331/67331 oscillators/(67) with electromagnetic or electrostatic shield
331/68331 oscillators/(68) with outer casing or housing
331/69331 oscillators/(68) with outer casing or housing (69) with temperature modifier
331/70331 oscillators/(70) with temperature modifier
331/71331 oscillators/(71) raw a.c. used as source of power or bias
331/72331 oscillators/(72) electron-coupled type
331/73331 oscillators/(72) electron-coupled type (73) piezoelectric crystal resonator
331/74331 oscillators/(74) combined with particular output coupling network
331/75331 oscillators/(74) combined with particular output coupling network (75) space discharge or unilaterally conductive device in output network
331/76331 oscillators/(74) combined with particular output coupling network (75) space discharge or unilaterally conductive device in output network (76) harmonic producing or selecting network
331/77331 oscillators/(74) combined with particular output coupling network (77) wave filter
331/78331 oscillators/(78) electrical noise or random wave generator
331/79331 oscillators/(79) beam tube
331/80331 oscillators/(79) beam tube (80) with beam sweeping or deflecting means
331/81331 oscillators/(79) beam tube (81) with electron bunching or velocity variation means
331/82331 oscillators/(79) beam tube (81) with electron bunching or velocity variation means (82) traveling wave type
331/83331 oscillators/(79) beam tube (81) with electron bunching or velocity variation means (83) multicavity type (e.g., klystron)
331/84331 oscillators/(79) beam tube (81) with electron bunching or velocity variation means (84) reflex type (i.e., with repeller electrode)
331/86331 oscillators/(86) with magnetically controlled space discharge device (e.g., magnetron)
331/87331 oscillators/(86) with magnetically controlled space discharge device (e.g., magnetron) (87) with particular pulsing means
331/88331 oscillators/(86) with magnetically controlled space discharge device (e.g., magnetron) (88) with frequency stabilization
331/89331 oscillators/(86) with magnetically controlled space discharge device (e.g., magnetron) (89) with secondary emissive electrode
331/90331 oscillators/(86) with magnetically controlled space discharge device (e.g., magnetron) (90) with frequency adjustment
331/91331 oscillators/(86) with magnetically controlled space discharge device (e.g., magnetron) (91) with undesired mode suppression or selection means
331/92331 oscillators/(92) retarding field tube-type oscillators (e.g., barkhausen kurz)
331/93331 oscillators/(92) retarding field tube-type oscillators (e.g., barkhausen kurz) (93) with distributed parameter resonator
331/95331 oscillators/(95) butterfly resonator
331/96331 oscillators/(96) with distributed parameter resonator
331/97331 oscillators/(96) with distributed parameter resonator (97) tube enclosed by resonator structure
331/98331 oscillators/(96) with distributed parameter resonator (97) tube enclosed by resonator structure (98) disk seal tube (e.g., lighthouse, pencil tube)
331/99331 oscillators/(96) with distributed parameter resonator (99) parallel wire type
331/100331 oscillators/(96) with distributed parameter resonator (99) parallel wire type (100) push-pull type
331/101331 oscillators/(96) with distributed parameter resonator (101) coaxial or shielded line type
331/102331 oscillators/(96) with distributed parameter resonator (101) coaxial or shielded line type (102) push-pull type
331/103331 oscillators/(103) tube structure forms inductive part of resonant circuit
331/104331 oscillators/(104) transit time oscillator
331/105331 oscillators/(105) with parasitic oscillation control or prevention means
331/106331 oscillators/(106) with periodoic or repetitious amplitude varying means (e.g., tremolo)
331/107R331 oscillators/(107r) solid state active element oscillator
331/108R331 oscillators/(107r) solid state active element oscillator (108r) transistors
331/109331 oscillators/(107r) solid state active element oscillator (108r) transistors (109) amplitude stabilization and control
331/110331 oscillators/(107r) solid state active element oscillator (108r) transistors (110) bridge type
331/111331 oscillators/(107r) solid state active element oscillator (108r) transistors (111) relaxation oscillator
331/112331 oscillators/(107r) solid state active element oscillator (108r) transistors (111) relaxation oscillator (112) blocking oscillator type
331/113R331 oscillators/(107r) solid state active element oscillator (108r) transistors (111) relaxation oscillator (113r) multivibrator type
331/113A331 oscillators/(107r) solid state active element oscillator (108r) transistors (111) relaxation oscillator (113r) multivibrator type (113a) saturable core controlled converters
331/113S331 oscillators/(107r) solid state active element oscillator (108r) transistors (111) relaxation oscillator (113r) multivibrator type (113s) converter using silicon control rectifiers
331/114331 oscillators/(107r) solid state active element oscillator (108r) transistors (114) push-pull
331/115331 oscillators/(107r) solid state active element oscillator (108r) transistors (115) negative resistance
331/116R331 oscillators/(107r) solid state active element oscillator (108r) transistors (116r) electromechanical resonator controlled
331/116FE331 oscillators/(107r) solid state active element oscillator (108r) transistors (116r) electromechanical resonator controlled (116fe) field-effect transistor active element
331/116M331 oscillators/(107r) solid state active element oscillator (108r) transistors (116r) electromechanical resonator controlled (116m) electromechanical resonators other than piezoelectric crystals
331/117R331 oscillators/(107r) solid state active element oscillator (108r) transistors (117r) l-c type
331/117FE331 oscillators/(107r) solid state active element oscillator (108r) transistors (117r) l-c type (117fe) field-effect transistor active element
331/117D331 oscillators/(107r) solid state active element oscillator (108r) transistors (117r) l-c type (117d) distributed parameter resonator transistor oscillators
331/108A331 oscillators/(107r) solid state active element oscillator (108r) transistors (108a) use of complimentary-type transistors
331/108B331 oscillators/(107r) solid state active element oscillator (108r) transistors (108b) phase shift oscillator
331/108C331 oscillators/(107r) solid state active element oscillator (108r) transistors (108c) integrated circuit oscillators
331/108D331 oscillators/(107r) solid state active element oscillator (108r) transistors (108d) integrated modules with discrete elements oscillators
331/107DP331 oscillators/(107r) solid state active element oscillator (107dp) significant distributed parameter resonator (e.g., cavity)
331/107P331 oscillators/(107r) solid state active element oscillator (107dp) significant distributed parameter resonator (e.g., cavity) (107p) parallel-connected oscillator devices
331/107SL331 oscillators/(107r) solid state active element oscillator (107dp) significant distributed parameter resonator (e.g., cavity) (107sl) stripline type
331/107C331 oscillators/(107r) solid state active element oscillator (107dp) significant distributed parameter resonator (e.g., cavity) (107c) coaxial type
331/107A331 oscillators/(107r) solid state active element oscillator (107a) acoustoelectric device oscillators
331/107G331 oscillators/(107r) solid state active element oscillator (107g) gunn-type bulk effect device oscillators
331/107S331 oscillators/(107r) solid state active element oscillator (107s) superconductive device oscillators
331/107T331 oscillators/(107r) solid state active element oscillator (107t) tunnel diode oscillators
331/126331 oscillators/(126) gaseous space discharge device
331/127331 oscillators/(126) gaseous space discharge device (127) spark or open arc type
331/128331 oscillators/(126) gaseous space discharge device (128) drives shock excited l.c. circuit
331/129331 oscillators/(126) gaseous space discharge device (129) relaxation oscillator
331/130331 oscillators/(126) gaseous space discharge device (129) relaxation oscillator (130) plural gaseous devices
331/131331 oscillators/(126) gaseous space discharge device (129) relaxation oscillator (131) discharge device or rectifier in "c" or "l" charging or discharging circuit
331/132331 oscillators/(132) negative resistance or negative transconductance oscillator
331/133331 oscillators/(132) negative resistance or negative transconductance oscillator (133) secondary emission (e.g., dynatron)
331/134331 oscillators/(132) negative resistance or negative transconductance oscillator (134) transitron type
331/135331 oscillators/(135) phase shift type
331/136331 oscillators/(135) phase shift type (136) zero phase shift
331/137331 oscillators/(135) phase shift type (137) with r.c. ladder-type phase shift network
331/138331 oscillators/(138) bridge type
331/139331 oscillators/(138) bridge type (139) piezoelectric crystal in bridge
331/140331 oscillators/(138) bridge type (140) r.c. or r.l. type
331/141331 oscillators/(138) bridge type (140) r.c. or r.l. type (141) wien bridge
331/142331 oscillators/(138) bridge type (140) r.c. or r.l. type (142) double t bridge
331/143331 oscillators/(143) relaxation oscillators
331/144331 oscillators/(143) relaxation oscillators (144) multivibrators
331/145331 oscillators/(143) relaxation oscillators (144) multivibrators (145) with sync, triggering or pulsing circuit
331/146331 oscillators/(143) relaxation oscillators (146) blocking oscillators
331/147331 oscillators/(143) relaxation oscillators (146) blocking oscillators (147) using discharge device with plural grids
331/148331 oscillators/(143) relaxation oscillators (146) blocking oscillators (148) with 3 or more winding feedback transformers
331/149331 oscillators/(143) relaxation oscillators (146) blocking oscillators (149) with sync, trigger, or pulsing circuit (e.g., self-pulsing)
331/150331 oscillators/(143) relaxation oscillators (150) output supplied to another discharge device circuit
331/151331 oscillators/(143) relaxation oscillators (151) involving resonant or inductive wave forming circuit or transformer
331/152331 oscillators/(143) relaxation oscillators (152) multi-grid discharge device in charged capacitor circuit
331/153331 oscillators/(143) relaxation oscillators (153) with sync, trigger or pulsing circuit
331/154331 oscillators/(154) electromechanical resonator
331/155331 oscillators/(154) electromechanical resonator (155) with optical, piezoelectric or acoustic coupling means
331/156331 oscillators/(154) electromechanical resonator (156) vibrating reed or string type (e.g., tuning fork)
331/157331 oscillators/(154) electromechanical resonator (157) magnetostrictive
331/158331 oscillators/(154) electromechanical resonator (158) crystal
331/159331 oscillators/(154) electromechanical resonator (158) crystal (159) plural tube
331/160331 oscillators/(154) electromechanical resonator (158) crystal (160) with means to limit crystal current or voltage
331/161331 oscillators/(154) electromechanical resonator (158) crystal (161) with crystal substitution
331/162331 oscillators/(154) electromechanical resonator (158) crystal (162) plural crystals in circuit
331/163331 oscillators/(154) electromechanical resonator (158) crystal (163) crystal having three or more electrodes in circuit
331/164331 oscillators/(154) electromechanical resonator (158) crystal (164) anode or cathode to grid crystal circuit
331/165331 oscillators/(165) shock excited resonant circuit
331/166331 oscillators/(165) shock excited resonant circuit (166) with keying means of the active element type (e.g., burst generator)
331/167331 oscillators/(167) l-c type oscillators
331/168331 oscillators/(167) l-c type oscillators (168) plural tubes
331/169331 oscillators/(167) l-c type oscillators (169) anode to cathode coupled or connected resonant circuit
331/170331 oscillators/(167) l-c type oscillators (170) anode to grid coupled or connected resonant circuit
331/171331 oscillators/(167) l-c type oscillators (171) grid to cathode coupled or connected resonant circuit
331/172331 oscillators/(172) with synchronizing, triggering or pulsing circuits
331/173331 oscillators/(172) with synchronizing, triggering or pulsing circuits (173) triggering or pulsing (e.g., burst generators)
331/174331 oscillators/(172) with synchronizing, triggering or pulsing circuits (173) triggering or pulsing (e.g., burst generators) (174) self-quenched
331/175331 oscillators/(175) frequency stabilization
331/176331 oscillators/(175) frequency stabilization (176) temperature or current responsive means in circuit
331/177R331 oscillators/(177r) with frequency adjusting means
331/178331 oscillators/(177r) with frequency adjusting means (178) cyclic frequency sweeping means (e.g., vibrato)
331/179331 oscillators/(177r) with frequency adjusting means (179) step-frequency change (e.g., band selection, frequency-shift keying)
331/180331 oscillators/(177r) with frequency adjusting means (180) reactance tube type
331/181331 oscillators/(177r) with frequency adjusting means (181) variable inductance device (e.g., saturable core or adjustable vane inductor)
331/177V331 oscillators/(177r) with frequency adjusting means (177v) with voltage sensitive capacitor
331/182331 oscillators/(182) amplitude control or stabilization
331/183331 oscillators/(182) amplitude control or stabilization (183) automatic
331/184331 oscillators/(184) having discharged device or particular construction
331/185331 oscillators/(185) with particular source of power or bias voltage
331/186331 oscillators/(185) with particular source of power or bias voltage (186) regulated
331/187331 oscillators/(187) miscellaneous oscillator structures

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