| Class 455 | TELECOMMUNICATIONS |
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![[List of Pre Grant Publications for class 455 subclass 1]](../as.gif) | ![[List of Patents for class 455 subclass 1]](../ps.gif) | 1 | INTERFERENCE SIGNAL TRANSMISSION (E.G., JAMMING) |
| | 2.01 | AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING |
| | 3.01 | WIRELESS DISTRIBUTION SYSTEM |
| | 3.02 |  Receiver for satellite broadcast |
| | 3.03 | Remote control of distribution |
| | 3.05 | Two-way |
| | 3.06 | Combined with diverse art device (e.g., audio/sound or entertainment system) |
| | 400 | HAVING SINGLE-CHANNEL TELEPHONE CARRIER |
| | 403 | RADIOTELEPHONE SYSTEM |
| | 404.1 | Emergency or alarm communication |
| | 405 | Usage measurement |
| | 410 | Security or fraud prevention |
| | 412.1 | Message storage or retrieval |
| | 414.1 | Special service |
| | 414.2 |  User location independent information retrieval |
| | 414.3 |  Based on request (e.g., news, weather, etc.) |
| | 414.4 | Format conversion (e.g., text, audio, etc.) |
| | 415 | Caller identification |
| | 416 | Call conferencing |
| | 417 | Call diversion |
| | 418 | Programming control |
| | 421 | Out-of-range indication |
| | 422.1 | Zoned or cellular telephone system |
| | 423 | Diagnostic testing, malfunction indication, or electrical condition measurement |
| | 426.1 | Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.) |
| | 426.2 | Wireless service for fixed premises equipment (e.g., Wireless Local Loop (WLL) Telco emulator, etc.) |
| | 427 | Space satellite |
| | 431 | Airborne or aircraft |
| | 432.1 | Roaming |
| | 432.2 | System format conversion |
| | 432.3 | Service profile |
| | 433 | Home location registration (HLR) or visitor location registration (VLR) detail |
| | 434 | Control or access channel scanning |
| | 435.1 | 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 |
| | 450 | Channel allocation |
| | 451 | Hybrid allocation |
| | 452.1 | Dynamic allocation |
| | 453 | Load balancing |
| | 454 | Spectrum sharing for different type of system (e.g., point-to-point microwave, television, etc.) |
| | 455 | Channel seizing |
| | 456.1 | Location monitoring |
| | 456.2 | Based on request signal |
| | 456.3 | Position based personal service |
| | 456.4 | Quiet or transmission prevention mode |
| | 456.5 | At system equipment (i.e., base station) |
| | 456.6 | At remote station (i.e., mobile station) |
| | 457 | Location display |
| | 458 | Specific paging technique |
| | 461 | Including personal numbering system (i.e., intelligent network for subscriber tracking or follow-me subscriber feature) |
| | 462 | Including private cordless extension system |
| | 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 |
| | 11.1 | Portable or mobile repeater |
| | 14 | With transmission line |
| | 15 | Two separate way transmission |
| | 17 | Plural modulated carriers |
| | 18 | With delay or recording |
| | 19 | Common antenna |
| | 20 | With frequency conversion |
| | 23 | Frequency or phase modulation |
| | 24 | Transmitter/receiver feedback compensation |
| | 25 | Directive antenna |
| | 26.1 | USE OR ACCESS BLOCKING (E.G., LOCKING SWITCH) |
| | 39 | TRANSMITTER AND RECEIVER AT SEPARATE STATIONS |
| | 40 | Earth or water medium |
| | 41.1 | Near field (i.e., inductive or capacitive coupling) |
| | 41.2 | Short range RF communication |
| | 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 |
| | 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 |
| | 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 |
| | 61 | Single message via plural modulation of single carrier |
| | 62 | Optimum frequency selection |
| | 63.1 | Distortion, noise, or other interference prevention, reduction, or compensation |
| | 63.2 | System with hierarchical coverage areas |
| | 63.3 | Frequency switching |
| | 63.4 | Directional antenna |
| | 64 | Plasma source or barrier |
| | 65 | Anti-multipath |
| | 66.1 | Having diverse art device |
| | 67.11 | Having measuring, testing, or monitoring of system or part |
| | 67.12 | Using a chamber (e.g., room testing or audio surveillance, etc.) |
| | 67.13 | Noise, distortion, or unwanted signal detection (e.g., quality control, etc.) |
| | 67.14 | Using a test signal |
| | 67.15 | Of a microwave link or system |
| | 67.16 | Phase measuring (e.g., group delay, propagation effect, etc.) |
| | 67.7 | With indication (e.g., visual or voice signalling, etc.) |
| | 68 | With control signal |
| | 73 | TRANSMITTER AND RECEIVER AT SAME STATION (E.G., TRANSCEIVER) |
| | 74 | Convertible (e.g., to diverse art device) |
| | 75 | With frequency stabilization (e.g., automatic frequency control) |
| | 77 | With tuning |
| | 78 | With transmitter-receiver switching or interaction prevention |
| | 84 | With a common signal processing stage |
| | 88 | Transceiver controlling a separate transceiver or receiver |
| | 550.1 | Radiotelephone equipment detail |
| | 551 | Number assignment module (NAM) detail |
| | 552.1 | Operable on more than one system |
| | 553.1 | Radiotelephone having plural transceivers (e.g., for analog and digital, trunking and cellular, etc.) |
| | 554.1 | Remote private branch exchange (PBX) with wireless link to landline |
| | 554.2 | Equipment detail for providing wireless link to fixed equipment (e.g., WLL, Telco emulator, etc.) |
| | 555 | Wireless private branch exchange (PBX) (i.e., wireless link to extension unit) |
| | 556.1 | Integrated with other device |
| | 557 | Interface attached device (e.g., interface with modem, facsimile, computer, etc.) |
| | 560 | Switching unit detail (e.g., mobile telephone switching office (MTSO), base station controller (BSC), etc.) |
| | 561 | Base station detail |
| | 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 |
| | 569.1 | Hands-free or loudspeaking arrangement |
| | 571 | Power booster |
| | 572 | Power supply |
| | 575.1 | Housing or support |
| | 90.1 | Having particular application (e.g., avalanche victim assistance) of a transceiver |
| | 90.2 | Having particular configuration (e.g., C.B., or walkie-talkie) of a transceiver |
| | 90.3 | Having particular housing or support of a transceiver |
| | 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 |
| | 106 | Modulation by absorption, shielding, or reflecting |
| | 107 | With variation of antenna impedance or dimension for modulation |
| | 108 | Amplitude modulation |
| | 110 | Angle modulation |
| | 111 | Including distributed parameter structure |
| | 112 | With frequency multiplication or division |
| | 113 | With frequency control |
| | 114.1 | Having harmonic radiation suppression |
| | 114.2 | Noise or interference elimination |
| | 115.1 | 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 |
| | 126 | With feedback of modulated output signal |
| | 127.1 | Power control, power supply, 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 |
| | 140 | Selectively actuated or controlled |
| | 141 | Including common stage (e.g., local oscillator) |
| | 142 | Convertible to different type (e.g., AM to FM) |
| | 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 |
| | 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) |
| | 158.1 | Channel index indication |
| | 158.2 | With electronic digital indication |
| | 158.4 | With multiple display functions |
| | 158.5 | Non-numeric display (e.g., call letters) |
| | 159.1 | Variable light indication |
| | 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 |
| | 164.1 | With automatic frequency control |
| | 165.1 | With frequency synthesizer |
| | 166.1 | With channel skipping selection |
| | 167.1 | With dual sweeping |
| | 168.1 | Multiband |
| | 169.1 | With particular variable voltage or current tuning |
| | 170.1 | With mechanical or electromechanical selection |
| | 171.1 | Time actuated |
| | 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 |
| | 181.1 | Time controlled |
| | 182.1 | With frequency control |
| | 182.3 | Fine tuning |
| | 183.1 | With frequency synthesizer |
| | 184.1 | With comparing desired and existing tuning conditions |
| | 185.1 | With channel information storage |
| | 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 |
| | 192.1 | With frequency control |
| | 193.1 | With antenna circuit tuning |
| | 194.1 | With muting (e.g., silent tuning) |
| | 195.1 | Variable voltage or current tuning |
| | 196.1 | Including variation of local oscillator frequency |
| | 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 |
| | 210 | With carrier amplitude modulation elimination (e.g., specified limiter) |
| | 212 | With squelch or other audio output silencing |
| | 214 | With particular discriminator or detector |
| | 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 |
| | 225 | Plural paths |
| | 226.1 | Measuring or testing of receiver |
| | 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 |
| | 246.1 | Responsive to plural inputs |
| | 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 |
| | 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 |
| | 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 |
| | 278.1 | Combined with noise or interference elimination |
| | 280 | With coupling to a stage of the receiver |
| | 281 | Having distributed parameters |
| | 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) |
| | 295 | Modulation distortion or cross talk correction or elimination |
| | 296 | Noise or interference elimination |
| | 297 | In vehicle |
| | 298 | Originating in power supply |
| | 300 | By shielding |
| | 302 | Image frequency suppression |
| | 303 | Using plural separate signal paths |
| | 307 | With specific filter structure |
| | 308 | With amplitude limiter |
| | 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 |
| | 317 | Unwanted oscillation or radiation prevention |
| | 318 | With specified local oscillator structure or coupling |
| | 319 | With particular coupling |
| | 321 | In a single envelope or with common active element (e.g., autodyne) |
| | 323 | Particular frequency conversion structure or circuitry |
| | 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 |
| | 341 | Amplifier |
| | 343.1 | Having particular power or bias supply (including self-powered or battery saving means) |
| | 344 | Combined with diverse art device |
| | 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 |
| | 899 | MISCELLANEOUS |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
| Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived. | ||
| FOR106 | PLURAL TRANSMITTERS OR RECEIVERS (I.E., MORE THAN TWO STATIONS) (455/49.1) |
| FOR107 | Noise, distortion, or singing reduction (455/50.1) |
| FOR113 | With central station (e.g., master, etc.) (455/53.1) |
| FOR114 | To or from mobile station (455/54.1) |
| FOR115 | With service request and response (455/54.2) |
| FOR116 | Using radiating transmission line (455/55.1) |
| FOR117 | Multiple base stations (455/56.1) |
| FOR118 | Plural receivers tuned to common frequency (455/57.1) |
| FOR119 | Break-in or priority override (455/58.1) |
| FOR120 | Lockout or busy-idle signalling (455/58.2) |
| FOR121 | PORTABLE OR MOBILE TRANSCEIVER (455/89) |
| FOR200 | HAVING SINGLE CHANNEL TELEPHONE CARRIER (379/64) |
| FOR201 | Including call signalling (e.g., ringing, off-hook, dialing) (379/65) |
| FOR202 | Over power line (379/66) |
| FOR203 | EXCLUSIVE ASSIGNED CHANNEL (455/34.1) |
| FOR204 | SEIZED CHANNEL (455/34.2) |
| FOR205 | RADIO TELEPHONE SYSTEM OR EQUIPMENT DETAIL (379/58) |
| FOR206 | Zoned or cellular (379/59, 455/33.1) |
| FOR210 | Including cordless extension set (i.e., having single subscriber line access) (379/61) |
| FOR212 | Including supervisory or control signalling (379/63) |
| FOR213 | AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING (455/2) |
| FOR214 | DISTRIBUTION SYSTEM (E.G., PLURAL CABLES, ETC.) (455/3.1) |
| FOR215 | Receiver for satellite broadcast (455/3.2) |
| FOR216 | Combined with power distribution network (455/3.3) |
| FOR217 | Remote control of distribution (455/4.1) |
| FOR219 | Two-way (455/5.1) |
| FOR220 | Common antenna or cable (455/6.1) |
| FOR222 | Combined with diverse art device (e.g., audio/sound or entertainment systems) (455/6.3) |
| FOR223 | Near field (e.g., inductive or capacitive coupling) (455/41) |
| FOR224 | Distortion, noise, or other interference prevention, reduction, or compensation (455/63) |
| FOR225 | With diverse art device (455/66) |
| FOR226 | With measuring, testing, or monitoring of system or part (455/67.1) |
| FOR227 | Using a chamber (e.g., room testing or audio surveillance, etc.) (455/67.2) |
| FOR228 | Noise, distortion or unwanted signal detection (e.g., quality control, etc.) (455/67.3) |
| FOR229 | Using a test signal (455/67.4) |
| FOR230 | Of a microwave link or system (455/67.5) |
| FOR231 | Phase measuring (e.g., group delay propagation effects, etc.) (455/67.6) |
| FOR232 | Housing or support (455/90) |
| FOR233 | With harmonic radiation suppression (455/114) |
| FOR234 | Measuring, testing, or monitoring of transmitter (455/115) |
| FOR235 | Power or bias voltage supply (455/127) |
| FOR236 | With particular power or bias supply (includes battery saving means and includes self-powered) (455/343) |
| FOR237 | Emergency or alarm communication (455/404) |
| FOR238 | Message storage or retrieval (455/412) |
| FOR239 | Special service (455/414) |
| FOR240 | Zoned or cellular telephone system (455/422) |
| FOR241 | Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.) (455/426) |
| FOR242 | Roaming (455/432) |
| FOR243 | Registration (455/435) |
| FOR245 | Location monitoring (455/456) |
| FOR246 | Radiotelephone equipment detail (455/550) |
| FOR247 | Operable on more than one system (455/552) |
| FOR249 | Remote private branch exchange (PBX) with wireless link to landline (455/554) |
| FOR250 | Integrated with other device (e.g., electronic notebook, personal digital assistant, etc.) (455/556) |
| FOR252 | Headgear (455/568) |
| FOR253 | Hands-free or loudspeaking arrangement (455/569) |
| FOR254 | Portable or mobile (455/575) |