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Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 330 | AMPLIFIERS |
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1R | WITH DIVERSE-TYPE ART DEVICE |
2 | WITH AMPLIFIER CONDITION INDICATING OR TESTING MEANS |
3 | WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES |
4 | WITH MASER-TYPE AMPLIFYING DEVICE |
4.5 | PARAMETRIC AMPLIFIERS |
4.6 | Traveling wave type |
4.8 | Gyromagnetic type (e.g., ferrite) |
4.9 | Semiconductor type (e.g., with semiconductor diode) |
5 | WITH SOLID ELEMENT WAVE PROPAGATING AMPLIFYING DEVICE |
6 | WITH HALL EFFECT TYPE MEANS |
7 | WITH CAPACITIVE AMPLIFYING DEVICE |
8 | WITH SATURABLE REACTOR-TYPE AMPLIFYING DEVICE |
9 | WITH PERIODIC SWITCHING INPUT-OUTPUT (E.G., FOR DRIFT CORRECTION) |
10 | MODULATOR-DEMODULATOR-TYPE AMPLIFIER |
11 | WITH D.C. REINSERTION CIRCUIT |
250 | WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) |
251 | Including Class D amplifier |
252 | Including differential amplifier |
253 | Having field effect transistor |
254 | Having gain control means |
255 | Having push-pull amplifier stage |
256 | Having temperature compensation means |
257 | Having current mirror amplifier |
258 | Having common mode rejection circuit |
259 | Having D.C. feedback bias control for stabilization |
260 | Having signal feedback means |
261 | Having particular biasing arrangement |
262 | Including push-pull amplifier |
263 | Having complementary symmetry |
264 | And field effect transistor |
265 | And feedback means |
266 | And temperature compensation |
267 | And particular biasing arrangement |
269 | Having field effect transistor |
270 | Having D.C. feedback bias control for stabilization |
271 | Having signal feedback means |
272 | Having temperature compensating means |
273 | Having particular biasing arrangement |
275 | Having balanced to unbalanced circuitry and vice versa |
276 | Having transformer |
277 | Including field effect transistor |
278 | Including gain control means |
279 | And significant control voltage developing means |
282 | Having feedback means acting as variable impedance |
284 | Having attenuation means in signal transmission path |
285 | Having particular biasing means |
286 | Including distributed parameter-type coupling |
288 | Including current mirror amplifier |
289 | Including temperature compensation means |
290 | Including D.C. feedback bias control for stabilization |
291 | Including signal feedback means |
292 | Having compensation for interelectrode impedance |
293 | Having negative feedback |
294 | Having frequency-responsive means or phase-shift means in feedback path |
295 | Including plural amplifier channels |
296 | Including particular biasing arrangement |
297 | Including particular power supply circuitry |
298 | Including protection means |
299 | Including combined diverse-type semiconductor device |
301 | Including balanced to unbalanced circuits and vice versa |
302 | Including frequency-responsive means in the signal transmission path |
303 | Including an active device in the filter means |
304 | And equalizing means |
305 | And tuning means |
306 | And bandpass, broadband (e.g., wideband) or sidepass means |
307 | Integrated circuits |
308 | Including atomic particle or radiant energy impinging on a semiconductor |
309 | Involving structure of three diverse function electrode type |
310 | Including plural stages cascaded |
41 | WITH GAS OR VAPOR TUBE AMPLIFYING DEVICE |
42 | WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE |
43 | WITH TRAVELING WAVE-TYPE TUBE |
44 | WITH ELECTRON BEAM TUBE AMPLIFYING DEVICE |
47 | WITH MAGNETICALLY INFLUENCED DISCHARGE DEVICE (E.G., MAGNETRONS) |
49 | WITH VACUUM TUBE HAVING DISTRIBUTED PARAMETER IMPEDANCE CHARACTERISTICS |
50 | WITH DUMMY TUBE |
51 | COMBINED WITH AUTOMATIC AMPLIFIER DISABLING SWITCH MEANS |
52 | WITH PILOT FREQUENCY CONTROL MEANS |
53 | WITH DISTRIBUTED PARAMETER-TYPE COUPLING MEANS |
54 | Distributed amplifier |
55 | Push-pull |
56 | Waveguide, cavity, or concentric line resonator |
57 | Artificial line |
58 | WITH ROTATING DYNAMOELECTRIC AMPLIFYING DEVICE |
59 | HAVING LIGHT-CONTROLLED OR ACTIVATED DEVICE (I.E., NOT LIGHT SIGNAL) |
60 | HAVING MAGNETOSTRICTIVE-TYPE AMPLIFYING DEVICE |
61R | WITH RESISTIVE-TYPE AMPLIFYING DEVICE |
63 | WITH MAGNETIC MEANS AMPLIFYING DEVICE |
64 | WITH SPACE CHARGE GRID TUBE |
65 | INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE |
69 | SUM AND DIFFERENCE AMPLIFIERS |
70 | ANODE ENERGIZED THROUGH DISCHARGE PATH OF CONTROLLED VACUUM TUBE |
71 | Plural discharge paths traversed by anode supply |
73 | Plural outputs |
74 | Separate signal inputs to series devices |
75 | SIGNAL FEEDBACK |
76 | Compensating for inter-electrode impedance (e.g., neutralization) |
77 | At least one push-pull stage |
78 | To or from electrode common to input and output |
79 | By transformer feedback |
80 | By coil in parallel to and resonating with inter-electrode capacity |
81 | At least one push-pull signal stage |
84 | Plural amplifier channels |
85 | Amplifier in signal feedback path |
86 | Variable impedance in feedback path varied by separate control path |
87 | Cathode impedance feedback |
88 | Cascade amplifier stages with cathode-cathode feedback |
90 | Combined with diverse-type feedback coupling |
94 | Frequency responsive means in cathode impedance feedback path |
95 | Nonlinear impedance means in cathode impedance feedback path |
96 | Combined with control of bias voltage of signal amplifier |
97 | Including D.C. path for signal feedback |
98 | In cascade amplifiers |
101 | Positive and negative feedback in same path at different frequencies |
102 | Current and voltage feedback |
103 | Multiple feedback paths |
105 | From impedance in series with output load (e.g., current feedback) |
106 | In series with input source |
107 | Phase shift means in loop path |
108 | Potentiometer common to signal and feedback path |
109 | Frequency responsive feedback means |
110 | Nonlinear impedance element in loop path |
111 | To or from an auxiliary grid or to the anode |
112 | Positive feedback |
113 | POLYPHASE POWER SUPPLY (I.E., FOR AN ELECTRODE, CATHODE HEATER, OR FILAMENT) |
114 | UNRECTIFIED A.C. POWER SUPPLY FOR AN ELECTRODE (I.E., NOT THE HEATER) |
116 | WITH BALANCED-TO-UNBALANCED COUPLING |
117 | WITH UNBALANCED-TO-BALANCED COUPLING |
118 | INCLUDING A PUSH-PULL STAGE |
119 | Coupling to or from cathode in push-pull |
120 | Interstage coupling between push-pull |
122 | Input and/or output coupling for push-pull |
123 | Power or bias supply circuits and control thereof |
124R | WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS) |
125 | D.C. and A.C. amplifier channels |
126 | Amplifying different frequencies in different channels |
124D | Redundant amplifier circuits |
127 | WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE |
128 | Control means for anode of screen grid circuit |
129 | With control of input electrode or gain control electrode bias |
130 | Bias controlled by separate external control source |
131 | Control of bias on separate gain control electrode |
132 | Frequency selective means to select control signal from amplifier channel |
133 | Different bias control means for different stages of cascade amplifier |
134 | Plural different bias control voltages provided by separate means |
135 | Amplitude limiting or bias voltage |
136 | Bias control signal from input of amplifier |
137 | Oscillator supplies or controls bias |
138 | Bias controlled by biased rectifier or discharge device |
139 | Electronic tube controls bias |
140 | Rectifier in bias control circuit |
141 | Time constant circuit in bias control circuit |
142 | Cathode resistor supplies bias (e.g., self-biasing circuits) |
143 | THERMALLY RESPONSIVE IMPEDANCE |
144 | VARIABLE IMPEDANCE FOR SIGNAL CHANNEL CONTROLLED BY SEPARATE CONTROL PATH |
146 | WHEATSTONE BRIDGE WITH AMPLIFIER IN AT LEAST ONE ARM |
147 | PLURAL SIGNAL INPUTS |
148 | PLURAL SIGNAL OUTPUTS |
149 | HUM OR NOISE OR DISTORTION BUCKING INTRODUCED INTO SIGNAL CHANNEL |
150 | CASCADED SIMILAR AMPLIFYING DEVICE OF DIFFERENT CHARACTERISTICS |
151 | WITH AMPLIFIER BYPASS MEANS (E.G., FORWARD FEED) |
152 | CASCADED DIFFERENTLY COUPLED BETWEEN STAGES |
153 | Including a cathode follower stage |
154 | Transformer or resonant circuit in interstage coupling (e.g., stagger tuning) |
155 | UNICONTROL OF COUPLING OR THE CIRCUITS ASSOCIATED THEREWITH |
156 | BOOTSTRAP COUPLING |
157 | INTERSTAGE COUPLING |
158 | Coupling to cathode |
160 | Coupling to plate or auxiliary grid |
162 | Output coupling from grid |
164 | With electronic tube or diode in coupling circuit |
165 | Transformer coupling |
166 | With additional reactive coupling |
167 | With additional impedance connected to "P" or "S" circuits |
168 | From cathode |
169 | With means for adjusting inductive coupling |
170 | With shielding |
171 | With transformer structure |
172 | Coupling from cathode |
174 | With electromechanical transducer (e.g., piezoelectric crystal) |
175 | With lattice or Wheatstone bridge network in coupling circuits |
176 | With T, H, or Pi network in coupling circuit |
177 | With coupling or blocking capacitor |
178 | With R or L in series between stages |
179 | L in anode or grid circuit |
180 | With R in anode and grid circuit (RC coupling) |
181 | D.C. coupled |
185 | INPUT NETWORKS |
192 | OUTPUT NETWORKS |
199 | WITH POWER OR BIAS VOLTAGE SUPPLY |
207R | MISCELLANEOUS |
FOREIGN ART COLLECTIONS | ||
FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
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