| Subclass |
| Title |
|---|
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ClassTitle
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| ===>
TELECOMMUNICATIONS
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| | | |
| 1 | ![[Patents]](../gifs/ps.gif) | INTERFERENCE SIGNAL TRANSMISSION (E.G., JAMMING) |
| 2 | | AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING |
| 3.1 | | DISTRIBUTION SYSTEM (E.G., PLURAL CABLES, ETC.) |
| 3.2 | | . Receiver for satellite broadcast |
| 3.3 | | . Combined with power distribution network |
| 4.1 | | . Remote control of distribution |
| 4.2 | | . . With subscriber selection or switching |
| 5.1 | | . Two-way |
| 6.1 | | . Common antenna or cable |
| 6.2 | | . . With specific cable converter |
| 6.3 | | . Combined with diverse art device (e.g., audio/sound or entertainment systems) |
| 400 | | HAVING SINGLE-CHANNEL TELEPHONE CARRIER |
| 401 | | . Including call signaling (e.g., ringing, off-hook, dialing) |
| 402 | | . Over power line |
| 403 | | RADIOTELEPHONE SYSTEM |
| 404 | | . Emergency or alarm communication |
| 405 | | . Usage measurement |
| 406 | | . . Billing |
| 407 | | . . . At subscriber unit |
| 408 | | . . . At remote station |
| 409 | | . . Rental |
| 410 | | . Security or fraud prevention |
| 411 | | . . Privacy, lock-out, or authentication |
| 412 | | . Message storage or retrieval |
| 413 | | . . Voice mail |
| 414 | | . Special service |
| 415 | | . . Caller identification |
| 416 | | . . Call conferencing |
| 417 | | . . Call diversion |
| 418 | | . Programming control |
| 419 | | . . Remote programming control |
| 420 | | . . . Control of another apparatus |
| 421 | | . Out-of-range indication |
| 422 | | . Zoned or cellular telephone system |
| 423 | | . . Diagnostic testing, malfunction indication, or electrical condition measurement |
| 424 | | . . . System equipment |
| 425 | | . . . Subscriber equipment |
| 426 | | . . Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.) |
| 427 | | . . Space satellite |
| 428 | | . . . Switching or routing |
| 429 | | . . . Cell projection |
| 430 | | . . . Ground station control |
| 431 | | . . Airborne or aircraft |
| 432 | | . . Roaming |
| 433 | | . . . Home location registration (HLR) or visitor location registration (VLR) detail |
| 434 | | . . Control or access channel scanning |
| 435 | | . . Registration |
| 436 | | . . Handoff |
| 437 | | . . . Mobile assisted or initiated |
| 438 | | . . . Serving site initiated |
| 439 | | . . . Handoff initiated by another source (e.g., target, user initiated, mobile switching center (MSC), or mobile telephone switching office (MTSO), etc.) |
| 440 | | . . . Based upon unit location |
| 441 | | . . . Based upon unit velocity |
| 442 | | . . . Soft handoff |
| 443 | | . . . Overlapping cells |
| 444 | | . . . Between macro and micro cells |
| 445 | | . . Call routing (e.g., to prevent backhaul, routing efficiency, least cost, or alternate routing) |
| 446 | | . . Including cell planning or layout |
| 447 | | . . . Frequency reuse scheme |
| 448 | | . . . Co-located systems |
| 449 | | . . . Hierarchical cell structure |
| 450 | | . . Channel allocation |
| 451 | | . . . Hybrid allocation |
| 452 | | . . . Dynamic allocation |
| 453 | | . . . Load balancing |
| 454 | | . . . Spectrum sharing for different type of system (e.g., point-to-point microwave, television, etc.) |
| 455 | | . . Channel seizing |
| 456 | | . . Location monitoring |
| 457 | | . . . Location display |
| 458 | | . . Specific paging technique |
| 459 | | . . . Meet-me system |
| 460 | | . . . Auto-dialing |
| 461 | | . Including personal numbering system (i.e., intelligent network for subscriber tracking or follow-me subscriber feature) |
| 462 | | . Including private cordless extension system |
| 463 | | . . Multi-users |
| 464 | | . . Channel selection or allocation |
| 465 | | . Including public cordless extension system |
| 466 | | . Auxiliary data signaling (e.g., short message service (SMS)) |
| 7 | | CARRIER WAVE REPEATER OR RELAY SYSTEM (I.E., RETRANSMISSION OF SAME INFORMATION) |
| 8 | | . Failure compensation (e.g., spare channel) |
| 9 | | . Monitoring |
| 10 | | . . Fading compensation |
| 11.1 | | . Portable or mobile repeater |
| 12.1 | | . . Space satellite |
| 13.1 | | . . . With plural repeater or relay systems |
| 13.2 | | . . . With synchronizing of satellites or system |
| 13.3 | | . . . With antenna feed network or multiple antenna switching |
| 13.4 | | . . . Power control |
| 14 | | . With transmission line |
| 15 | | . Two separate way transmission |
| 16 | | . . Simultaneous using plural repeaters at each location |
| 17 | | . Plural modulated carriers |
| 18 | | . With delay or recording |
| 19 | | . Common antenna |
| 20 | | . With frequency conversion |
| 21 | | . . With demodulator |
| 22 | | . . Plural conversion stages |
| 23 | | . Frequency or phase modulation |
| 24 | | . Transmitter/receiver feedback compensation |
| 25 | | . Directive antenna |
| 26.1 | | USE OR ACCESS BLOCKING (E.G., LOCKING SWITCH) |
| 31.1 | | SYSTEM WITH RECEIVER SELECTION |
| 31.2 | | . Control of selectively responsive paging arrangement over telephone line |
| 31.3 | | . . Two-way paging system |
| 32.1 | | . Receiver scans for address signal |
| 35.1 | | . Tone coded squelch |
| 36.1 | | . . Plural tones |
| 37.1 | | . . . Difference frequency |
| 38.1 | | . Coded sequence |
| 38.2 | | . . With actuation (e.g., turn on/off or alarm indication, etc.) |
| 38.3 | | . . . Power control or battery saving |
| 38.4 | | . . . Visual indication |
| 38.5 | | . . . Tone sequence |
| 39 | | TRANSMITTER AND RECEIVER AT SEPARATE STATIONS |
| 40 | | . Earth or water medium |
| 41 | | . Near field (e.g., inductive or capacitive coupling) |
| 42 | | . Frequency or phase modulation |
| 43 | | . . With modification of frequencies of analog signal passed (e.g., pre-emphasis and de-emphasis) |
| 44 | | . . With stated modulation index |
| 45 | | . . Via subcarrier |
| 46 | | . Suppressed carrier wave system |
| 47 | | . Single or vestigial sideband system |
| 48 | | . Inverted sideband |
| 500 | | . Plural transmitters or receivers (i.e., more than two stations) |
| 501 | | . . Noise, distortion, or singing reduction |
| 502 | | . . . Synchronized stations |
| 503 | | . . . . Simulcast system |
| 504 | | . . . Fading compensation |
| 505 | | . . . . Due to weather |
| 506 | | . . . . Rayleigh or multipath fading |
| 507 | | . . Central station (e.g., master, etc.) |
| 508 | | . . . Having console |
| 509 | | . . . Channel allocation |
| 510 | | . . . . Plural requests (e.g., retries) |
| 511 | | . . . . Control channel/voice channel conversion |
| 512 | | . . . . Based on priority |
| 513 | | . . . . Ranking (e.g., based on signal strength, etc.) |
| 514 | | . . . . Having storage detail |
| 515 | | . . . Control channel monitoring (i.e., paging or access channel signaling) for system access |
| 516 | | . . . Channel seizing |
| 517 | | . . . To or from mobile station |
| 518 | | . . . . Having talk group |
| 519 | | . . . . . Talk group forming (e.g., dynamic regrouping, talk group assignment) |
| 520 | | . . . . . On-site or multi-site trunking |
| 521 | | . . . . Emergency dispatch or response |
| 522 | | . . . . Transmission power control technique |
| 523 | | . . . . Using radiating transmission line |
| 524 | | . . . . Multiple base stations |
| 525 | | . . . . . Base station selection |
| 526 | | . . . Plural receivers tuned to common frequency |
| 527 | | . . Break-in or priority override |
| 528 | | . . Lockout or busy-idle signaling |
| 59 | | . Single message via plural carrier wave transmission |
| 60 | | . . Different phases of same frequency carrier |
| 61 | | . Single message via plural modulation of single carrier |
| 62 | | . Optimum frequency selection |
| 63 | | . Distortion, noise, or other interference prevention, reduction, or compensation |
| 64 | | . . Plasma source or barrier |
| 65 | | . . Anti-multipath |
| 66 | | . With diverse art device |
| 67.1 | | . With measuring, testing, or monitoring of system or part |
| 67.2 | | . . Using a chamber (e.g., room testing or audio surveillance, etc.) |
| 67.3 | | . . Noise, distortion or unwanted signal detection (e.g., quality control, etc.) |
| 67.4 | | . . Using a test signal |
| 67.5 | | . . Of a microwave link or system |
| 67.6 | | . . Phase measuring (e.g., group delay, propagation effects, etc.) |
| 67.7 | | . . With indication (e.g., visual or voice signalling, etc.) |
| 68 | | . With control signal |
| 69 | | . . Transmitter controlled by signal feedback from receiver |
| 70 | | . . Receiver control signal originates at message transmitter |
| 71 | | . . . Frequency control |
| 72 | | . . . For compression and expansion of message signal (i.e., companding) |
| 73 | | TRANSMITTER AND RECEIVER AT SAME STATION (E.G., TRANSCEIVER) |
| 74 | | . Convertible (e.g., to diverse art device) |
| 74.1 | | . . Cordless/corded conversion |
| 75 | | . With frequency stabilization (e.g., automatic frequency control) |
| 76 | | . . Synthesizer |
| 77 | | . With tuning |
| 78 | | . With transmitter-receiver switching or interaction prevention |
| 79 | | . . Automatic (e.g., voice operated) |
| 80 | | . . . With distributed parameter coupling |
| 81 | | . . . . Waveguide |
| 82 | | . . . Common antenna |
| 83 | | . . Single antenna switched between transmitter and receiver |
| 84 | | . With a common signal processing stage |
| 85 | | . . Transmitter oscillator used as detector |
| 86 | | . . Transmitter oscillator used as local oscillator |
| 87 | | . . . Tunable or variable |
| 88 | | . Transceiver controlling a separate transceiver or receiver |
| 550 | | . Radiotelephone equipment detail |
| 551 | | . . Number assignment module (NAM) detail |
| 552 | | . . Operable on more than one system |
| 553 | | . . . Dual mode telephone (i.e., analog and digital) |
| 554 | | . . Remote private branch exchange (PBX) with wireless link to landline |
| 555 | | . . Wireless private branch exchange (PBX) (i.e., wireless link to extension unit) |
| 556 | | . . Integrated with other device (e.g., electronic notebook, personal digital assistant, etc.) |
| 557 | | . . Interface attached device (e.g., interface with modem, facsimile, computer, etc.) |
| 558 | | . . . Card control element |
| 559 | | . . . Smart cable |
| 560 | | . . Switching unit detail (e.g., mobile telephone switching office (MTSO), base station controller (BSC), etc.) |
| 561 | | . . Base station detail |
| 562 | | . . . Having specific antenna arrangement |
| 563 | | . . Having voice recognition or synthesization |
| 564 | | . . Auto-dialing or repertory dialing (e.g., using bar code, etc.) |
| 565 | | . . Restrictive dialing circuitry |
| 566 | | . . Having display |
| 567 | | . . Call alerting |
| 568 | | . . Headgear |
| 569 | | . . Hands-free or loudspeaking arrangement |
| 570 | | . . . Noise suppression or echo cancellation |
| 571 | | . . Power booster |
| 572 | | . . Power supply |
| 573 | | . . . Battery charging |
| 574 | | . . . Power conservation |
| 575 | | . Portable or mobile |
| 90 | | . Housing or support |
| 91 | | TRANSMITTER |
| 92 | | . Remote control of a transmitter |
| 93 | | . Convertible to different type (e.g., AM to FM) |
| 94 | | . Alternator |
| 95 | | . Mobile or portable |
| 96 | | . . Transmitter ejected from moving vehicle |
| 97 | | . . With antenna ejection or external support |
| 98 | | . . With aircraft, satellite, or projectile |
| 99 | | . . With vehicle |
| 100 | | . . Body attached or connected |
| 101 | | . Diversity |
| 102 | | . Plural modulation |
| 103 | | . Plural separate transmitters or channels |
| 104 | | . . Carrier and sidebands separately transmitted |
| 105 | | . . Common frequency |
| 106 | | . Modulation by absorption, shielding, or reflecting |
| 107 | | . With variation of antenna impedance or dimension for modulation |
| 108 | | . Amplitude modulation |
| 109 | | . . Vestigial or single sideband or suppressed carrier |
| 110 | | . Angle modulation |
| 111 | | . . Including distributed parameter structure |
| 112 | | . . With frequency multiplication or division |
| 113 | | . . With frequency control |
| 114 | | . With harmonic radiation suppression |
| 115 | | . Measuring, testing, or monitoring of transmitter |
| 116 | | . Carrier amplitude control (e.g., voice operated on/off) |
| 117 | | . With electrical protection of transmitter circuit or operator |
| 118 | | . Frequency conversion |
| 119 | | . Carrier frequency stabilization |
| 120 | | . Including tuning |
| 121 | | . . In antenna circuit |
| 122 | | . . . With saturable reactor |
| 123 | | . . . Automatically controlled |
| 124 | | . . Distributed parameter device |
| 125 | | . . Automatic adjustment of tuning |
| 126 | | . With feedback of modulated output signal |
| 127 | | . Power or bias voltage supply |
| 128 | | . With casing or housing |
| 129 | | . With coupled antenna |
| 130 | | RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER |
| 131 | | . Frequency conversion between signal source (e.g., wave collector) and receiver |
| 132 | | . Plural receivers |
| 133 | | . . With output selecting |
| 134 | | . . . By signal strength |
| 135 | | . . . By signal quality (e.g., signal to noise ratio) |
| 136 | | . . . With control (e.g., automatic gain control, automatic frequency control, etc.) |
| 137 | | . . With output combining |
| 138 | | . . . With control (e.g., automatic gain control) |
| 139 | | . . . . Frequency or phase control |
| 140 | | . . Selectively actuated or controlled |
| 141 | | . . Including common stage (e.g., local oscillator) |
| 142 | | . Convertible to different type (e.g., AM to FM) |
| 143 | | . . With distinct signal path for each type |
| 144 | | . . With dual purpose amplifying or other stage |
| 145 | | . Panoramic display |
| 146 | | . . Plural separate paths or plural oscillators |
| 147 | | . . Particular local oscillator control |
| 148 | | . . With oscilloscope sweep signal derivation or control |
| 149 | | . Plural output (e.g., plural speakers) (not stereo) |
| 150.1 | | . Signal selection based on frequency (e.g., tuning) |
| 151.1 | | . . Remote control of channel or station selection |
| 151.2 | | . . . Wireless link (sonic, RF, or infrared) |
| 151.3 | | . . . Remote oscillator tuned |
| 151.4 | | . . . Plural electronic devices controlled |
| 152.1 | | . . . Of or combined with vehicle receiver |
| 153.1 | | . . . Mechanical |
| 153.2 | | . . . . With wired link |
| 154.1 | | . . With indication of frequency, channel, or selector condition (e.g., tuning aid) |
| 154.2 | | . . . Scanning display |
| 155.1 | | . . . By meter |
| 156.1 | | . . . Audible indicator |
| 157.1 | | . . . Analog frequency indication (e.g., dial) |
| 157.2 | | . . . . With light indication or bar type |
| 158.1 | | . . . Channel index indication |
| 158.2 | | . . . . With electronic digital indication |
| 158.3 | | . . . . . Using a counter |
| 158.4 | | . . . . With multiple display functions |
| 158.5 | | . . . . Non-numeric display (e.g., call letters) |
| 159.1 | | . . . Variable light indication |
| 159.2 | | . . . . Plural lamps |
| 160.1 | | . . Plural tuning modes (e.g., manual and scanning, etc.) |
| 161.1 | | . . Frequency scanning |
| 161.2 | | . . . With processor control |
| 161.3 | | . . . Using signal strength or quality |
| 162.1 | | . . . Motor activated |
| 163.1 | | . . . . Reversible motor (e.g., end-stop control) |
| 164.1 | | . . . With automatic frequency control |
| 164.2 | | . . . . Processor controlled (AFC) |
| 165.1 | | . . . With frequency synthesizer |
| 166.1 | | . . . With channel skipping selection |
| 166.2 | | . . . . With priority channel selection |
| 167.1 | | . . . With dual sweeping |
| 168.1 | | . . . Multiband |
| 169.1 | | . . . With particular variable voltage or current tuning |
| 169.2 | | . . . . With varactor diode |
| 170.1 | | . . With mechanical or electromechanical selection |
| 171.1 | | . . . Time actuated |
| 172.1 | | . . . . Including a motor |
| 173.1 | | . . . With automatic frequency control of fine tuning |
| 174.1 | | . . . With muting (e.g., silent tuning) |
| 175.1 | | . . . With carrier wave preset |
| 176.1 | | . . . Combined with band selection |
| 177.1 | | . . . Combined with other control (e.g., bandwidth, volume, gain, etc.) |
| 178.1 | | . . . With plurality of tunable circuits |
| 179.1 | | . . Channel or station selection |
| 180.1 | | . . . Combined with band selection |
| 180.2 | | . . . . UHF and VHF |
| 180.3 | | . . . . . With phase locked loop (PLL) tuning |
| 180.4 | | . . . . . Varactor tuned (e.g., varactor diode) |
| 181.1 | | . . . Time controlled |
| 182.1 | | . . . With frequency control |
| 182.2 | | . . . . Automatic (AFC) |
| 182.3 | | . . . Fine tuning |
| 183.1 | | . . . With frequency synthesizer |
| 183.2 | | . . . . Processor controlled |
| 184.1 | | . . . With comparing desired and existing tuning conditions |
| 185.1 | | . . . With channel information storage |
| 186.1 | | . . . . With memory control or programming |
| 186.2 | | . . . . . Having a keyboard |
| 187.1 | | . . . Separate tuned circuits for each channel or station |
| 188.1 | | . . Band selection |
| 188.2 | | . . . UHF and VHF |
| 189.1 | | . . . With plural separate mixer or converter circuits |
| 190.1 | | . . . With frequency conversion |
| 191.1 | | . . . With plurality of tuned circuits |
| 191.2 | | . . . . Varactor tuned |
| 191.3 | | . . . . With switching between stages |
| 192.1 | | . . With frequency control |
| 192.2 | | . . . Automatic (AFC) |
| 192.3 | | . . . Fine tuning |
| 193.1 | | . . With antenna circuit tuning |
| 193.2 | | . . . With plural resonant circuits |
| 193.3 | | . . . Including varactor diode |
| 194.1 | | . . With muting (e.g., silent tuning) |
| 194.2 | | . . . Amplifier controlled |
| 195.1 | | . . Variable voltage or current tuning |
| 196.1 | | . . Including variation of local oscillator frequency |
| 197.1 | | . . . By simultaneous control with signal selection |
| 197.2 | | . . . . Variable capacitor tuned |
| 197.3 | | . . . . . Including additional tuning circuit |
| 198.1 | | . . . . Including distributed parameter control device |
| 199.1 | | . . . . Discrete frequency types (e.g., channel switching) |
| 200.1 | | . . With other control (e.g., volume, gain, bandwidth, etc.) |
| 201 | | . Exalted carrier |
| 202 | | . Suppressed carrier |
| 203 | | . Carrier and single sideband |
| 204 | | . Vestigial sideband |
| 205 | | . Frequency or phase modulation |
| 206 | | . . Responsive to one of overlapping signals |
| 207 | | . . With plural conversion |
| 208 | | . . With synchronized or controlled local oscillator |
| 209 | | . . . Plural local oscillators or mixers |
| 210 | | . . With carrier amplitude modulation elimination (e.g., specified limiter) |
| 211 | | . . . Combined with other function |
| 212 | | . . With squelch or other audio output silencing |
| 213 | | . . . Using specified filter |
| 214 | | . . With particular discriminator or detector |
| 215 | | . . . Superregenerative |
| 216 | | . . With particular frequency division or multiplication |
| 217 | | . With protection circuit for receiver circuit |
| 218 | | . Squelch |
| 219 | | . . With automatic gain or volume control |
| 220 | | . . Adjustable |
| 221 | | . . Audio responsive |
| 222 | | . . Noise controlled |
| 223 | | . . . Short duration (noise blankers) |
| 224 | | . . . . Separate broadband detector channel |
| 225 | | . . Plural paths |
| 226.1 | | . Measuring or testing of receiver |
| 226.2 | | . . Signal strength |
| 226.3 | | . . Signal-to-noise ratio |
| 226.4 | | . . With meter or indicator |
| 227 | | . Responsive to an input signal of particular predetermined frequency |
| 228 | | . . Responsive to specified modulation (e.g., call alarm, Conelrad) |
| 229 | | . . Responsive to carrier absence or presence |
| 230 | | . Local control of receiver operation |
| 231 | | . . Applied at or for specific intervals or periods of time |
| 232.1 | | . . Gain control |
| 233.1 | | . . . With diverse control (tone, etc.) |
| 234.1 | | . . . Automatic |
| 234.2 | | . . . . Processor controlled |
| 235.1 | | . . . . Forward acting |
| 236.1 | | . . . . Variable conversion efficiency (variable oscillator amplitude, etc.) |
| 237.1 | | . . . . Responsive to locally injected pilot |
| 238.1 | | . . . . Responsive to vehicle speed |
| 239.1 | | . . . . Nonlinear automatic gain control |
| 240.1 | | . . . . . Variable automatic gain control loop gain |
| 241.1 | | . . . . . Different gain stages |
| 242.1 | | . . . . . Delayed |
| 242.2 | | . . . . . . Different delay for different signal stages or thresholds |
| 243.1 | | . . . . . . Radio frequency stage only delayed |
| 244.1 | | . . . . . Dual time constant |
| 245.1 | | . . . . Automatic gain control signal derived from information signal |
| 245.2 | | . . . . . Plural stages controlled |
| 246.1 | | . . . . Responsive to plural inputs |
| 247.1 | | . . . . . Separate automatic gain control signals |
| 248.1 | | . . . . Constant or controlled input impedance |
| 249.1 | | . . . . Variable attenuator type |
| 250.1 | | . . . . Automatic gain control to improve strong signal handling |
| 251.1 | | . . . . Plural stages with different levels or bias to each stage (e.g., partial automatic gain control) |
| 252.1 | | . . . . Semiconductor |
| 253.1 | | . . . . Plural stages controlled with plates, screen grids, or cathodes connected in parallel |
| 253.2 | | . . . . Plural amplifier stages |
| 254 | | . . Sensitivity control |
| 255 | | . . Local oscillator frequency control |
| 256 | | . . . Combined with other control |
| 257 | | . . . Automatic |
| 258 | | . . . . Utilizing particular local oscillator control |
| 259 | | . . . . . Reference oscillator or source |
| 260 | | . . . . . . Phase lock loop or frequency synthesizer |
| 261 | | . . . . . Variable reactance (e.g., reactance tube) |
| 262 | | . . . . . . Voltage controlled capacitor |
| 263 | | . . . . . Discriminator or detector |
| 264 | | . . . . . Voltage control of oscillator |
| 265 | | . . . . With local oscillator synchronization or locking |
| 266 | | . . Selectivity or bandwidth control |
| 267 | | . . Tone control |
| 268 | | . . Fidelity control |
| 269 | | . With wave collector (e.g., antenna) |
| 270 | | . . Power-line or receiver element used as wave collector |
| 271 | | . . Suppression of radiation from receiver via wave collector |
| 272 | | . . Plural separate collectors |
| 273 | | . . . With particular output combining |
| 274 | | . . . . Loop or coil antenna |
| 275 | | . . . With frequency changing or selecting in the output path of one or more collectors |
| 276.1 | | . . . With phase shifting, correcting, or regulating in the output path of one or more collectors |
| 277.1 | | . . . Selectively or alternately connected to receiver |
| 277.2 | | . . . . By signal quality (e.g., noise) |
| 278.1 | | . . . Combined with noise or interference elimination |
| 279.1 | | . . . . Plural antenna currents entering single transformer |
| 280 | | . . With coupling to a stage of the receiver |
| 281 | | . . . Having distributed parameters |
| 282 | | . . . . Transmission line |
| 283 | | . . . Undesired signal or noise control (e.g., antistatic) |
| 284 | | . . . . Balancing or cancelling |
| 285 | | . . . . With image frequency suppression |
| 286 | | . . . . Wave filter, coil, or wave trap |
| 287 | | . . . . Shunt or bypass |
| 288 | | . . . . Particular composition (e.g., of cell or element) |
| 289 | | . . . With coupling varying, regulating, or control |
| 290 | | . . . Including passive tuned circuit |
| 291 | | . . . Using active device (e.g., as preamplifier or reactance) |
| 292 | | . . . Transformer or other passive inductance |
| 293 | | . . . Specified stage (e.g., mixer, amplifier, or demodulator) |
| 294 | | . . . . With particular electron tube structure |
| 295 | | . Modulation distortion or cross talk correction or elimination |
| 296 | | . Noise or interference elimination |
| 297 | | . . In vehicle |
| 298 | | . . Originating in power supply |
| 299 | | . . . Filter or rectification in power supply energized by fluctuating or a.c. source |
| 300 | | . . By shielding |
| 301 | | . . . Plural or compartmented shielding structure |
| 302 | | . . Image frequency suppression |
| 303 | | . . Using plural separate signal paths |
| 304 | | . . . Phase shift in at least one path |
| 305 | | . . . With balancing or neutralizing |
| 306 | | . . . . Filter in at least one path |
| 307 | | . . With specific filter structure |
| 308 | | . . With amplitude limiter |
| 309 | | . . . In demodulator or low frequency (audio amplifier circuit) |
| 310 | | . . Internally generated noise or oscillations |
| 311 | | . . In radio frequency amplifier, intermediate frequency amplifier or converter circuit |
| 312 | | . . In demodulator or low frequency (e.g., audio frequency) |
| 313 | | . Frequency modifying or conversion |
| 314 | | . . Plural separate successive conversions |
| 315 | | . . . With plural separate local oscillators |
| 316 | | . . . . With frequency stabilization for at least one local oscillator |
| 317 | | . . Unwanted oscillation or radiation prevention |
| 318 | | . . With specified local oscillator structure or coupling |
| 319 | | . . . With particular coupling |
| 320 | | . . . . Lumped impedance |
| 321 | | . . . In a single envelope or with common active element (e.g., autodyne) |
| 322 | | . . . . Plural common electrode |
| 323 | | . . Particular frequency conversion structure or circuitry |
| 324 | | . . . Homodyne (i.e., zero beat or synchrodyne reception) |
| 325 | | . . . Including distributed electrical parameter structure |
| 326 | | . . . . With balanced mixer |
| 327 | | . . . . . Stripline |
| 328 | | . . . . . Hollow waveguide |
| 329 | | . . . . Electron beam tube |
| 330 | | . . . . With nonlinear impedance (e.g., diode) |
| 331 | | . . . Crystal or electron tube diode |
| 332 | | . . . Push-pull |
| 333 | | . . . Transistor or integrated circuit |
| 334 | | . With particular receiver circuit |
| 335 | | . . Plural diverse function tube or stage (performs plural functions alternately or concurrently) |
| 336 | | . . Superregenerative detector or discriminator |
| 337 | | . . Discriminator or demodulator |
| 338 | | . . Coupling or decoupling between stages |
| 339 | | . . . Band pass filter |
| 340 | | . . . Variably tunable or adjustable |
| 341 | | . . Amplifier |
| 342 | | . . . Reflex type |
| 343 | | . . With particular power or bias supply (includes battery saving means and includes self-powered) |
| 344 | | . Combined with diverse art device |
| 345 | | . . With vehicle |
| 346 | | . . . Detachable for portability |
| 347 | | . Cabinet, housing, or chassis structure |
| 348 | | . . With retractable or readily detachable chassis |
| 349 | | . . Sectional or interconnectable (e.g., modules) |
| 350 | | . . With particular speaker mounting |
| 351 | | . . Transportable |
| 352 | | . Remote control of receiver |
| 353 | | . . Plural conditions from remote station |
| 354 | | . . . Mechanical |
| 355 | | . . Amplitude, volume, or gain control |
| 899 | | MISCELLANEOUS |
| | | ********************************** |
| | | FOREIGN ART COLLECTIONS |
| | | ******************************* |
| | | Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collection listed below. These collections contain ONLY foreign patents or nonpatent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived. |
| FOR 200 | | HAVING SINGLE CHANNEL TELEPHONE CARRIER (379/64) |
| FOR 201 | | . Including call signalling (e.g., ringing, off-hook, dialing) (379/65) |
| FOR 202 | | . Over power line (379/66) |
| FOR 203 | | EXCLUSIVE ASSIGNED CHANNEL (455/34.1) |
| FOR 204 | | SEIZED CHANNEL (455/34.2) |
| FOR 205 | | RADIO TELEPHONE SYSTEM OR EQUIPMENT DETAIL (379/58) |
| FOR 206 | | . Zoned or cellular (379/59, 455/33.1) |
| FOR 207 | | . . Hand-off control (379/60, 455/33.2) |
| FOR 208 | | . . . Using plural antennas (455/33.3) |
| FOR 209 | | . . Having overlapping zones (455/33.4) |
| FOR 210 | | . Including cordless extension set (i.e., having single subscriber line access) (379/61) |
| FOR 211 | | . . Having privacy or lockout (e.g., identity verification) (379/62) |
| FOR 212 | | . Including supervisory or control signalling (379/63) |
| FOR 106 | | PLURAL TRANSMITTERS OR RECEIVERS (I.E., MORE THAN TWO STATIONS) (455/49.1) |
| FOR 107 | | . Noise, distortion, or singing reduction (455/50.1) |
| FOR 108 | | . . Synchronized stations (455/51.1) |
| FOR 109 | | . . . Simulcast system (455/51.2) |
| FOR 110 | | . . Fading compensation (455/52.1) |
| FOR 111 | | . . . Due to weather attenuation (455/52.2) |
| FOR 112 | | . . . Rayleigh or multipath fading (455/52.3) |
| FOR 113 | | . With central station (e.g., master, etc.) (455/53.1) |
| FOR 114 | | . . To or from mobile station (455/54.1) |
| FOR 115 | | . . . With service request and response (455/54.2) |
| FOR 116 | | . . . Using radiating transmission line (455/55.1) |
| FOR 117 | | . . . Multiple base stations (455/56.1) |
| FOR 118 | | . . Plural receivers tuned to common frequency (455/57.1) |
| FOR 119 | | . Break-in or priority override (455/58.1) |
| FOR 120 | | . Lockout or busy-idle signalling (455/58.2) |
| FOR 121 | | PORTABLE OR MOBILE TRANSCEIVER (455/89) |
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