| Class 327 | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
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![[List of Pre Grant Publications for class 327 subclass 1]](../as.gif) | ![[List of Patents for class 327 subclass 1]](../ps.gif) | 1 | SPECIFIC SIGNAL DISCRIMINATING (E.G., COMPARING, SELECTING, ETC.) WITHOUT SUBSEQUENT CONTROL |
| | 2 |  By phase |
| | 13 | By shape |
| | 18 | By presence or absence pulse detection |
| | 22 | By pulse noncoincidence |
| | 23 | By pulse coincidence |
| | 28 | By polarity |
| | 31 | By pulse width or spacing |
| | 32 |  With shock-excited circuit |
| | 33 | With sampling |
| | 34 | Narrow pulse elimination or suppression |
| | 35 | Separating by duration or gap (e.g., duty cycle, etc.) |
| | 36 | Selection of a particular pulse width |
| | 37 | Comparison by threshold or reference |
| | 38 | With plural paths |
| | 39 | By frequency |
| | 40 | Comparison between plural inputs |
| | 44 | With predetermined frequency selection |
| | 47 | Frequency detection |
| | 50 | By amplitude |
| | 51 | With sensing amplifier |
| | 58 | Maximum or minimum amplitude |
| | 59 |  Employing input compared to output |
| | 60 | Employing input compared to reference derived therefrom |
| | 61 | By diode-capacitor network |
| | 62 | Maximum and minimum amplitude |
| | 63 | Comparison between plural varying inputs |
| | 64 | With logic or bistable circuit |
| | 65 | Differential input |
| | 68 | Input provides varying reference signal |
| | 69 | With plural paths |
| | 71 | Three or more inputs |
| | 72 | Input signal compared to reference derived therefrom |
| | 74 | Input signal compared to plural fixed references |
| | 77 | Input signal compared to single fixed reference |
| | 78 | Reference level crossover detecting |
| | 80 | Reference determined by threshold of single circuit element |
| | 82 | Plural sources of input signal |
| | 83 | Temperature compensation |
| | 84 | With bridge circuit |
| | 85 | Inverting input or output |
| | 86 | With transformer |
| | 87 | Having feedback |
| | 88 | With source as reference |
| | 89 | With differential amplifier |
| | 90 | Comparison between two characteristics of an input signal |
| | 91 | Including details of sampling or holding |
| | 97 | With logic or bistable circuit |
| | 98 | By separating composite signal |
| | 99 | Having selection between plural continuous waveforms |
| | 100 | SIGNAL CONVERTING, SHAPING, OR GENERATING |
| | 101 | Converting input current or voltage to output frequency |
| | 102 | Converting input frequency to output current or voltage |
| | 103 | Converting input voltage to output current or vice versa |
| | 104 | Converting, per se, of an AC input to corresponding DC at an unloaded output |
| | 105 | Synthesizer |
| | 106 | Having stored waveform data (e.g., in ROM, etc.) |
| | 107 | Having digital device (e.g., logic gate, flip-flop, etc.) |
| | 108 | Current driver |
| | 109 | Having semiconductive load |
| | 110 | Having inductive load (e.g., coil, etc.) |
| | 111 | Having capacitive load |
| | 113 | Frequency or repetition rate conversion or control |
| | 114 | Of output rectangular waveform |
| | 117 | Frequency division |
| | 119 | Frequency multiplication (e.g., harmonic generation, etc.) |
| | 124 | By periodic switching (e.g., chopper, etc.) |
| | 125 | Generating parabolic or hyperbolic output |
| | 126 | Generating staircase output |
| | 129 | Generating sinusoidal output |
| | 130 | Generating trapezoidal output |
| | 131 | Generating sawtooth or triangular output |
| | 132 | With current source or current mirror |
| | 133 | With distortion control (e.g., linearization, etc.) |
| | 134 | With slope or duration control |
| | 135 | Having digital element |
| | 136 | Having particular delay or sync |
| | 137 | Having feedback |
| | 138 | Having temperature compensation |
| | 139 | Having inductive load |
| | 140 | With amplitude control |
| | 141 | Synchronizing |
| | 142 | Reset (e.g., initializing, starting, stopping, etc.) |
| | 144 | Using multiple clocks |
| | 145 | Having different frequencies |
| | 146 | With feedback |
| | 151 | With counter |
| | 152 | With choice between multiple delayed clocks |
| | 153 | With delay means |
| | 154 | With feedforward |
| | 155 | With feedback |
| | 160 | With counter |
| | 161 | With delay means |
| | 162 | Having reference source |
| | 164 | Generating rectangular (e.g., clock, etc.) or pulse waveform having random characteristic (e.g., random width, etc.) |
| | 165 | Regenerating or restoring rectangular (e.g., clock, etc.) or pulse waveform |
| | 166 | Having digital device (e.g., logic gate, flip-flop, etc.) |
| | 167 | Having network providing particular mathematical function (e.g., integrator, etc.) |
| | 168 | Having inductive device (e.g., transformer, etc.) |
| | 169 | Having negative resistance device (e.g., tunnel diode, etc.) |
| | 170 | Slope control of leading or trailing edge of rectangular (e.g., clock, etc.) or pulse waveform |
| | 171 | Output pulses having opposite polarities |
| | 172 | Rectangular (e.g., clock, etc.) or pulse waveform width control |
| | 173 | Pulse narrowing |
| | 174 | Pulse broadening |
| | 175 | Duty cycle control |
| | 176 | Having digital device (e.g., logic gate, flip-flop, etc.) |
| | 177 | Having inductive device (e.g., transformer, etc.) |
| | 178 | Rectangular (e.g., clock, etc.) or pulse waveform amplitude control |
| | 181 | Electromagnetic pulse forming |
| | 182 | Delay line or capacitor storage element charged or discharged through or by a relaxation oscillator type circuit to form pulse |
| | 183 | Delay line or capacitor storage element charges or discharges through a tube to form pulse |
| | 184 | Rectangular (e.g., clock, etc.) or pulse waveform generating by conversion from input AC (e.g., sine, etc.) wave |
| | 185 | Particular stable state circuit (e.g., tristable, etc.) |
| | 186 | Superconductive (e.g., cryogenic, etc.) |
| | 187 | External effect device (e.g., light, heat, magnetic, or mechanical force sensitive devices, etc.) |
| | 188 | Minority carrier storage effect |
| | 190 | With transformer or saturable core device |
| | 192 | Negative resistance transistor (e.g., unijunction, etc.) |
| | 194 | Zener or capacitive diode |
| | 195 | Negative resistance diode having "N"-shape characteristic on I-V plot (e.g., tunnel diode, backward diode, etc.) |
| | 196 | Negative resistance diode having "S"-shape characteristic on I-V plot (e.g., four or more layer semiconductor device, etc.) |
| | 197 | Convertible circuit (e.g., bistable to monostable, D-type to T-type, etc.) |
| | 198 | Initializing, resetting, or protecting a steady state condition |
| | 199 | Circuit having only two stable states (i.e., bistable) |
| | 200 | Dynamic bistable |
| | 202 | Master-slave bistable latch |
| | 203 |  Including field-effect transistor |
| | 204 | Including multi-emitter or multi-collector bipolar transistor |
| | 205 | Using hysteresis (e.g., Schmitt trigger, etc.) |
| | 207 | Including diverse solid state devices (e.g., FET/bipolar, etc.) |
| | 208 | Including field-effect transistor |
| | 214 | Complementary transistors |
| | 215 | Having at least two cross-coupling paths |
| | 216 | JK type input |
| | 217 | RS or RST type input |
| | 218 | D type input |
| | 219 | Particular device at input, output, or in cross-coupling path |
| | 223 | Plural transistors of same conductivity type |
| | 224 | With single semiconductor device |
| | 225 | With logic element (e.g., NOR gate, etc.) |
| | 226 | With single electron tube |
| | 227 | Monostable |
| | 231 | Phase shift by less than period of input |
| | 232 | Dependent on frequency |
| | 233 | Correction to specific phase shift |
| | 234 | Dependent on variable controlled phase shifts |
| | 235 | Dependent on multiple fixed phase shifts |
| | 236 | By phase comparator or detector |
| | 237 | Variable or adjustable |
| | 238 | Quadrature related (i.e., 90 degrees) |
| | 239 | Non-overlapping multiple outputs |
| | 240 | Maintaining invariant amplitude |
| | 241 | With counter or shift register |
| | 243 | With feedback |
| | 246 | With differential amplifier |
| | 248 | With adder |
| | 250 | With active time delay element |
| | 252 | With passive time delay element |
| | 254 | Quadrature related (i.e., 90 degrees) |
| | 256 | Phase inversion (i.e., 180 degrees between input and output) |
| | 258 | Multiple outputs |
| | 260 | Producing AC power control |
| | 261 | Having specific delay in producing output waveform |
| | 262 | Including significant compensation (e.g., temperature compensated delay, etc.) |
| | 263 | Delay interval set by rising or falling edge |
| | 264 | Having specific active circuit element or structure (e.g., FET, complementary transistors, etc.) |
| | 268 | Having specific passive circuit element or structure (e.g., RLC circuit, etc.) |
| | 269 | Multiple outputs with plurality of delay intervals |
| | 270 | Variable or adjustable |
| | 271 | Including delay line or charge transfer device |
| | 272 | Having specific active circuit element or structure(e.g., FET, complementary transistors, etc.) |
| | 276 | Single output with variable or selectable delay |
| | 277 | Including delay line or charge transfer device |
| | 278 | Having specific active circuit element or structure (e.g., complementary transistors, etc.) |
| | 283 | Having specific passive circuit element or structure (e.g., RLC circuit, etc.) |
| | 284 | Including delay line or charge transfer device |
| | 285 | Having specific active circuit element or structure (e.g., complementary transistors, etc.) |
| | 290 | Having specific passive circuit element or structure (e.g., RLC circuit, etc.) |
| | 291 | Clock or pulse waveform generating |
| | 292 | Clock fault compensation or redundant clocks |
| | 293 | With plural paths in network |
| | 295 | Plural outputs |
| | 298 | Single clock output with multiple inputs |
| | 299 | Single clock output with single clock input or data input |
| | 300 | With saturable inductance |
| | 301 | With electron beam type tube |
| | 302 | With storage diode |
| | 303 | With rectifier |
| | 304 | With inductive device (e.g., transformer, etc.) |
| | 305 | With gas tube |
| | 306 | Amplitude control |
| | 307 | Baseline or DC offset correction |
| | 308 | Variable attenuator |
| | 309 | By limiting, clipping, or clamping |
| | 310 | Transient or signal noise reduction |
| | 311 | By filtering |
| | 312 | By feedback limiting-clamping |
| | 313 | Using 3 or more terminal type nonlinear devices only |
| | 314 | Using diode type nonlinear devices only |
| | 315 | Providing constant input/output amplitude level ratio |
| | 317 | Distortion compensation |
| | 318 | In input or output circuit |
| | 323 | Feedback |
| | 324 | By using diverse-type nonlinear devices |
| | 325 | Using only diode active elements |
| | 327 | Using only transistor active elements |
| | 329 | With tuned circuit |
| | 330 | With rectifier or nonlinear impedance |
| | 331 | Maintaining constant level output |
| | 333 | Interstage coupling (e.g., level shift, etc.) |
| | 334 | SPECIFIC INPUT TO OUTPUT FUNCTION |
| | 335 | By differentiating |
| | 336 | By integrating |
| | 337 | Having switched capacitance |
| | 338 | With thermionic tube |
| | 339 | With summing or counting |
| | 340 | Single vacuum tube |
| | 341 | With compensation |
| | 342 | With transducer |
| | 343 | With rectifier circuit |
| | 344 | Including RC circuit |
| | 345 | Having feedback |
| | 346 | Exponential |
| | 350 | Logarithmic |
| | 354 | Absolute value |
| | 355 | Combining of plural signals |
| | 362 | With compensation |
| | 363 | Having feedback |
| | 364 | With vacuum tube |
| | 365 | GATING (I.E., SWITCHING INPUT TO OUTPUT) |
| | 366 | Superconductive (e.g., cryogenic, etc.) device |
| | 367 | Josephson junction |
| | 368 | Critical current control |
| | 369 | External control (e.g., piezoelectric, light, etc.) |
| | 372 | Inductive effect |
| | 373 | Layout |
| | 374 | Accelerating switching |
| | 378 | Compensation for variations in external physical values (e.g., temperature, etc.) |
| | 379 | Signal transmission integrity or spurious noise override |
| | 380 | Preventing quick rise gating current (i.e., di/dt) |
| | 381 | Preventing quick rise gating voltage (i.e., dv/dt) |
| | 382 | Parasitic prevention or compensation (e.g., parasitic capacitance, etc.) |
| | 383 | Ensuring fully conducting state |
| | 384 | Switch noise signal |
| | 387 | Control signal derived from or responsive to input signal |
| | 389 | Insulated gate FET (e.g., MOSFET, etc.) |
| | 392 | Delay controlled switch (e.g., fixed, single time of delay control, etc.) |
| | 393 | With variable or multiple adjustable time of delay control (e.g., variable charge-discharge, on-delay/off-delay control, etc.) |
| | 394 | With field-effect device |
| | 395 | Propagation through plural delay devices or paths |
| | 396 | With plural switching elements (e.g., sequential, etc.) |
| | 397 | Including negative resistance device in delay circuit (e.g., unijunction transistor, etc.) |
| | 398 | For predetermined time period |
| | 399 | With field-effect device |
| | 400 | Propagation through plural delay devices or paths |
| | 401 | With plural switching elements (e.g., sequential, etc.) |
| | 402 | Including negative resistance device in delay circuit (e.g., unijunction transistor, etc.) |
| | 403 | Parallel controlled paths |
| | 407 | Converging with plural inputs and single output |
| | 415 | Diverging with single input and plural outputs |
| | 419 | Utilizing three or more electrode solid-state device |
| | 420 | Breakdown characteristic (e.g., punch-through, tunneling, etc.) |
| | 423 | Bridge circuit |
| | 425 | Bilateral transistor |
| | 427 | Field-effect transistor |
| | 428 | With silicon controlled rectifier (SCR) |
| | 429 | Four or more electrode solid-state device |
| | 430 | JFET (i.e., junction field-effect transistor) |
| | 432 | With bipolar transistor |
| | 434 | Insulated gate FET (e.g., MOSFET, etc.) |
| | 438 | Four or more layer device (e.g., thyristor, etc.) |
| | 439 | Bipolar transistor circuit configuring SCR device |
| | 440 | GTO (i.e., gate turnoff) |
| | 441 | Plural or combined with other four or more layer device |
| | 442 | Separate ON and OFF control circuit |
| | 443 | Transformer or inductor in control circuit |
| | 444 | Complex wave supply |
| | 447 | AC supply |
| | 448 | Device in bridge |
| | 449 | PUT (i.e., programmable unijunction transistor) |
| | 450 | Four electrodes |
| | 451 | Zero point switching |
| | 453 | Silicon controlled rectifier (SCR) |
| | 454 |  With unijunction transistor |
| | 455 | Triac |
| | 456 |  Plural |
| | 457 | Combined with diac |
| | 458 | Combined with diverse four or more layer device |
| | 459 | With bipolar transistor |
| | 460 | Plural SCRs |
| | 463 | With bipolar transistor |
| | 464 | Having plural four or more layer devices |
| | 465 | DC supply |
| | 466 | PUT (i.e., programmable unijunction transistor) |
| | 467 | Four electrodes |
| | 468 | SCR and unijunction transistor |
| | 469 | Triac |
| | 470 | Plural devices |
| | 475 | SCR and bipolar transistor |
| | 476 | Triac |
| | 477 | Unijunction transistor (UJT) |
| | 478 | Bipolar transistor |
| | 479 | Special four or more electrode device (e.g., multiple bases, three electrode bipolar with FET gate, etc.) |
| | 482 | Plural |
| | 493 | Utilizing two electrode solid-state device |
| | 494 | Bridge circuit |
| | 498 | Negative resistance |
| | 499 | "N"-shape curve on I-V plot (e.g., tunnel diode type, etc.) |
| | 500 | "S"-shape curve on I-V plot (e.g., pnpn diode type, etc.) |
| | 502 | Breakdown characteristic (e.g., zener diode, etc.) |
| | 503 | PIN diode |
| | 504 | PN junction diode |
| | 506 | Three or more electrode electron tube |
| | 507 | Two electrode electron tube |
| | 509 | EXTERNAL EFFECT |
| | 510 | Magnetic |
| | 512 | Temperature |
| | 514 | Light |
| | 516 | Utilizing conversion of mechanical variations into electrical variations (e.g., vibration sensitive, etc.) |
| | 517 | Responsive to proximity or touch |
| | 518 | WITH PARTICULAR CONTROL |
| | 519 | Plurality of load devices |
| | 520 | Plural active components included in a controlling circuit |
| | 523 | Gaseous tube |
| | 524 | SPECIFIC IDENTIFIABLE DEVICE, CIRCUIT, OR SYSTEM |
| | 525 | Fusible link or intentional destruct circuit |
| | 526 | Redundant |
| | 527 | Superconductive (e.g., cryogenic, etc.) device |
| | 530 | With specific source of supply or bias voltage |
| | 531 | Fluctuating or AC source with rectifier or filter |
| | 534 | Having particular substrate biasing |
| | 538 | Stabilized (e.g., compensated, regulated, maintained, etc.) |
| | 539 | Using bandgap |
| | 540 | With voltage source regulating |
| | 542 | With diverse type transistor devices |
| | 543 | Using field-effect transistor |
| | 544 | Power conservation or pulse type |
| | 545 | Including signal protection or bias preservation |
| | 547 | With selectively or alternately DC or AC input |
| | 548 | With oscillator or interrupter |
| | 549 | With hum or interaction prevention |
| | 550 | With particular filament heating circuit |
| | 551 | Unwanted signal suppression |
| | 560 | Nonlinear amplifying circuit |
| | 564 | Integrated structure |
| | 567 | Thin film |
| | 568 | Negative resistance type |
| | 569 | Unijunction transistor |
| | 570 | Having "N"-shape curve on I-V plot (e.g., tunnel diode type, etc.) |
| | 571 | Having "S"-shape curve on I-V plot (e.g., pnpn diode type, etc.) |
| | 572 | Secondary emissive type |
| | 574 | Utilizing a three or more electrode solid-state device |
| | 575 | Darlington connection |
| | 576 | Complementary transistors |
| | 577 | Multiple emitter transistor |
| | 578 | Multiple collector transistor |
| | 579 | Minority carrier storage |
| | 580 | Transistor breakdown device (e.g., avalanche, zener, punch through, etc.) |
| | 581 | Field-effect transistor |
| | 582 | Four or more layer device (e.g., silicon-controlled rectifier, etc.) |
| | 583 | Utilizing two electrode solid-state device |
| | 584 | Breakdown diode (e.g., zener diode, avalanche diode, etc.) |
| | 585 | Minority carrier storage diode (e.g., enhancement diode, etc.) |
| | 586 | Capacitive diode |
| | 587 | Bridge circuit |
| | 588 | With bridge circuit |
| | 589 | With bootstrap circuit |
| | 590 | With particular feedback |
| | 591 | Tube performs plural functions |
| | 592 | With oscillation prevention |
| | 593 | With distributed parameter circuit |
| | 594 | With particular coupling or decoupling |
| | 595 | With particular connecting |
| | 596 | Including oscillatory or shock-excited circuit |
| | 597 | With particular grid control |
| | 598 | With particular tube structure |
| | 603 | MISCELLANEOUS |
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