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| Class 340 | COMMUNICATIONS: ELECTRICAL |
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![[List of Pre Grant Publications for class 340 subclass 850]](../as.gif) | ![[List of Patents for class 340 subclass 850]](../ps.gif) | 850 | UNDERWATER |
| | 853.1 | WELLBORE TELEMETERING OR CONTROL (E.G., SUBSURFACE TOOL GUIDANCE, DATA TRANSFER, ETC.) |
| | 853.2 |  Diagnostic monitoring or detecting operation of communications equipment or signal |
| | 853.3 | Selective control of subsurface equipment |
| | 853.4 |  In horizontal or inclined drilling or passage |
| | 853.6 | Control of drill bit or apparatus (e.g., steering, speed, etc.) |
| | 853.7 | Repeater in subsurface link (e.g., cable, etc.) |
| | 853.8 | With orientation sensing of subsurface telemetering equipment (other than drilling equipment) |
| | 853.9 | Including detail of subsurface signal storage (e.g., memory, recorder, register, etc.) |
| | 854.1 | With position or depth recording (e.g., line payout, equipment locator, etc.) |
| | 854.3 | Using a specific transmission medium (e.g., conductive fluid, annular spacing, etc.) |
| | 854.4 | Drill string or tubing support signal conduction |
| | 854.5 | Wellbore casing or ground |
| | 854.6 | Electromagnetic energy (e.g., radio frequency, etc.) |
| | 854.7 |  Optical link (e.g., waveguide, etc.) |
| | 854.8 | Near field coupling (e.g., inductive, capacitive, etc.) |
| | 854.9 | Cable or wire (e.g., conductor as support, etc.) |
| | 855.3 | Multiplexed signals |
| | 855.4 | Pulse or digital signal transmission |
| | 855.7 | Modification of signal bandwidth, frequency, or circuit impedance at subsurface location |
| | 855.8 | Including specified power transmission feature or source (e.g., battery, etc.) |
| | 856.1 | In horizontal or inclined passage arrangement |
| | 856.2 | With expandable or inflatable sensor element or mounting |
| | 856.3 | Including particular sensor |
| | 870.01 | CONTINUOUSLY VARIABLE INDICATING (E.G., TELEMETERING) |
| | 870.02 | With meter reading |
| | 870.04 | With calibration |
| | 870.05 | With calculation |
| | 870.07 | Combined (TM system with other system) |
| | 870.1 | For radio sonde |
| | 870.11 | Plural transmitters |
| | 870.16 | Condition responsive |
| | 870.18 | Using a particular modulation (e.g., phase, frequency, or amplitude) |
| | 870.25 | Phase variation |
| | 870.26 | Frequency variation |
| | 870.27 | Plural circuits, each for particular magnitude |
| | 870.28 | Via radiant energy beam (via particular energy) |
| | 870.3 | With particular transmitter (e.g., piezoelectric, dynamo) |
| | 870.31 | Inductive transmitter |
| | 870.37 | Capacitive transmitter |
| | 870.38 | Resistive transmitter |
| | 870.39 | With supply voltage regulation or compensation |
| | 870.4 | With particular receiver (e.g., ratiometer) |
| | 901 | EXTERNAL CONDITION VEHICLE-MOUNTED INDICATOR OR ALARM |
| | 902 | Transmitter in another vehicle (e.g., emergency vehicle) |
| | 904 | Transmitter in one vehicle only |
| | 905 | Highway information (e.g., weather, speed limits, etc.) |
| | 906 | OVERRIDE OF TRAFFIC CONTROL INDICATOR BY COMMAND TRANSMITTER |
| | 907 | TRAFFIC CONTROL INDICATOR |
| | 908 | Portable |
| | 909 | Plural intersections under common central station control |
| | 910 | Central station responsive to traffic detectors |
| | 911 | Central station controls offset (time between beginning of same phase at adjacent intersections) |
| | 912 | Standby cycling implemented if invalid transmission received or loss of transmission occurs |
| | 913 | Offset control |
| | 914 | Split control |
| | 915 | Central station includes display of status of indicators |
| | 916 | Intersection normally under local controller |
| | 917 | Controller responsive to traffic detectors |
| | 918 | Controller, when changing right of way, alters or skips normal "go" cycle of street having no traffic detected |
| | 919 | Plural cross highways at intersection each have traffic detectors |
| | 922 | Density determines split |
| | 923 | Extension of time |
| | 924 | Local controller can be superceded by central station controller |
| | 925 | Pedestrian control |
| | 926 | Manual setting of cycle length and split times |
| | 927 | Rotating cam structure (specific structure required) |
| | 928 | Combined (e.g., toll systems, one-way) |
| | 929 | Indication of time remaining before change of phase |
| | 931 | Traffic control or local controller failure indicator |
| | 932 | Pacing (e.g., vehicle keeps pace with sequentially activated lights) |
| | 932.1 | Pivoted |
| | 932.2 | VEHICLE PARKING INDICATORS |
| | 933 | VEHICLE DETECTORS |
| | 934 | Density |
| | 935 | Discriminates vehicle direction |
| | 936 | Speed and overspeed |
| | 937 | With camera |
| | 938 | Compensation for vehicle remaining at sensor position |
| | 939 | Environmental or drift compensation |
| | 940 | With pneumatic |
| | 941 | Inductive |
| | 942 | Photoelectric |
| | 943 | Sonic or ultrasonic |
| | 944 | PEDESTRIAN GUIDANCE |
| | 945 | AIRCRAFT ALARM OR INDICATING SYSTEMS |
| | 946 | Nonairplane (e.g., balloon or helicopter) |
| | 947 | Land-based landing guidance |
| | 948 | Aircraft actuation of land-based landing guides |
| | 949 | Wind direction |
| | 950 | Movable (e.g., rotatable) guides |
| | 951 | Phased landing guidance (e.g., runway approach, landing, touchdown) |
| | 952 | Particular energy guide source (e.g., sound, electric field, radio) |
| | 958 | Docking guidance |
| | 959 | Takeoff indicator |
| | 960 | Landing gear indicator |
| | 961 | Potential collision with other aircraft |
| | 962 | Icing indicator |
| | 963 | Flight alarm |
| | 964 | Phased warnings for same flight condition |
| | 965 | Tactile |
| | 966 | Stall |
| | 967 | Attitude (including yaw, angle of attack, roll, pitch, glide slope) |
| | 968 | Wind shear |
| | 969 | Speed |
| | 970 | Altitude |
| | 971 | Nonalarm flight indicator |
| | 972 | Runway presentation |
| | 973 | Indicator of at least four flight parameters (altitude, speed, etc.) |
| | 974 | Attitude |
| | 977 | Altitude |
| | 978 | Speed |
| | 979 | Heading (includes deviation from desired course) |
| | 980 | Indicator visible in pilot's line of sight through windscreen |
| | 981 | Aircraft beacons |
| | 983 | Obstruction beacon |
| | 984 | WATERCRAFT ALARM OR INDICATING SYSTEMS |
| | 988 | VEHICLE POSITION INDICATION |
| | 989 | At remote location |
| | 990 | With map display |
| | 991 | Position indication transmitted by vehicle after receipt of information from local station |
| | 992 | Position indication transmitted at periodic intervals (e.g., distance travelled) |
| | 993 | Position indication transmitted by local station to remote location |
| | 994 | Vehicle's arrival or expected arrival at remote location along route indicated at that remote location (e.g., bus arrival systems) |
| | 995.1 | Map display |
| | 995.11 | Having plural maps |
| | 995.12 | Transmission of map data to vehicle |
| | 995.14 | Manipulation of map display or data |
| | 995.19 | Route determination and display on map |
| | 995.24 | Including landmark information |
| | 995.25 | Including vehicle position correction |
| | 995.26 | Including particular display structure (e.g., detachable, rolling map sheet, etc.) |
| | 995.27 | Including particular display feature (e.g., indication of direction, mileage, road type, etc.) |
| | 995.28 | Including particular position/direction sensor |
| | 996 | Prerecorded message describes position |
| | 425.5 | LAND VEHICLE ALARMS OR INDICATORS |
| | 426.1 | Of burglary or unauthorized use |
| | 427 | Of motorcycles or bicycles |
| | 428 | Responsive to changes in voltage or current in a vehicle electrical system |
| | 429 | Responsive to inertia, vibration, or tilt |
| | 430 | With entrance/exit time delay |
| | 426.11 | Including immobilization |
| | 426.13 | Remote control |
| | 426.14 | Programmable |
| | 426.15 | Status indication |
| | 426.16 | Transmitter and receiver in vehicle |
| | 426.17 | Transmitter on user |
| | 426.18 | Remote alarm |
| | 426.22 | Local indication |
| | 426.24 | Including specified sensor |
| | 426.25 | Plural diverse sensors |
| | 426.26 | Detecting intruder energy (e.g., infrared, etc.) |
| | 426.27 | Window (i.e., glass) |
| | 426.28 | Door or lock |
| | 426.29 | Trunk or hood |
| | 426.3 | Ignition switch |
| | 426.31 | Steering wheel |
| | 426.32 | Brake |
| | 426.33 | Wheel/tire |
| | 426.34 | Accessory (e.g., speaker, radio face plate, etc.) |
| | 426.35 | Including programmable key |
| | 426.36 | Including keyless entry |
| | 431 | For trailer |
| | 432 | For bicycle |
| | 433 | For school bus |
| | 434 | For taxi |
| | 435 | Of relative distance from an obstacle |
| | 436 | Of collision or contact with external object |
| | 438 | Internal alarm or indicator responsive to a condition of the vehicle |
| | 439 | Operation efficiency (e.g., engine performance, driver habits) |
| | 440 | Tilt, imbalance, or overload |
| | 441 | Speed of vehicle, engine, or power train |
| | 442 | Tire deflation or inflation |
| | 449 | Temperature |
| | 450 | Fluid level |
| | 451 | Fluid pressure |
| | 453 | Brake or clutch condition |
| | 455 | Battery charging system condition |
| | 456 | Gear position |
| | 457 | Reminder |
| | 457.1 | Of seat belt application |
| | 457.2 | Of headlight energization |
| | 457.3 | Of parking brake application |
| | 457.4 | Of service interval expiration |
| | 458 | Lamp or lamp circuit condition |
| | 459 | Plural conditions |
| | 463 | External alarm or indicator of movement |
| | 464 | Plural indications (e.g., go, slow, stop) |
| | 465 | Turning or steering |
| | 466 | Speed |
| | 467 | Acceleration or deceleration |
| | 468 | External signal light system |
| | 469 | With two or more intensity levels (e.g., day or night) |
| | 470 | Pass - no pass |
| | 471 | Hazard warning or distress signalling |
| | 474 | With audible signal |
| | 475 | Turn signal |
| | 479 | Brake light |
| | 480 | Electromagnetically actuated mechanical signal |
| | 146.2 | DIGITAL COMPARATOR SYSTEMS |
| | 500 | CONDITION RESPONSIVE INDICATING SYSTEM |
| | 501 | With particular system function (e.g., temperature compensation, calibration) |
| | 502 | Acknowledgement |
| | 504 | Answer-back |
| | 505 | Interrogator-responder |
| | 506 | Alarm system supervision |
| | 507 | Fail-safe |
| | 508 | Redundant (e.g., added circuit or loop) |
| | 509 | Plural or diverse current sources |
| | 510 | Bridge or potential divider |
| | 511 | Threshold or window (e.g., of analog electrical level) |
| | 512 | Pulse |
| | 513 | Diode |
| | 514 | Testing |
| | 517 | Selection from a plurality of sensed conditions |
| | 518 | Scanning |
| | 519 | Worst condition |
| | 520 | First sensed exclusively indicated |
| | 521 | Plural diverse conditions |
| | 523 | Particular sequence of conditions |
| | 524 | Condition position indicator |
| | 526 | Predetermined rate of occurrence |
| | 527 | Time delay |
| | 531 | With particular coupling link |
| | 532 | Having particular safety function |
| | 533 | Wired |
| | 539.1 | Radio |
| | 539.11 | Including personal portable device |
| | 539.14 | Including remote residential device |
| | 539.16 | Including central station detail |
| | 539.22 | Having plural distinct sensors (i.e., for surrounding conditions) |
| | 539.26 | Specific environmental sensor |
| | 539.3 | Including power saving |
| | 539.31 | Including tamper resistant device |
| | 539.32 | Including location of misplaced item |
| | 540 | Specific condition |
| | 541 | Intrusion detection |
| | 542 | Lock |
| | 544 | Disturbance of fluid pressure |
| | 545.1 | Door or window movement |
| | 546 |  Portable |
| | 545.2 | Specified sensor |
| | 547 |  Magnetic sensor |
| | 548 | Plug or cord tension sensor |
| | 549 | Rotatable sensor |
| | 545.3 | Sensing of electromagnetic energy (e.g., light, infrared, or microwave) |
| | 545.4 | Sensing of electrical parameter (e.g., piezoelectricity or capacitance) |
| | 545.5 | Inertia-type sensor (e.g., mercury or pendulum switch) |
| | 545.6 | Door, cover, or lid for self-contained article (e.g., refrigerator, mailbox, drawer, cabinet, or box) |
| | 545.7 | Specified door or window portion (e.g., doorknob) |
| | 545.8 | Specified door or window attachment (e.g., shade or blind) |
| | 545.9 | Plural doors or windows |
| | 550 | Partition penetration |
| | 551 | Disturbance of magnetic field |
| | 552 | Disturbance of electromagnetic waves |
| | 561 | Disturbance of electric field |
| | 565 | Responsive to intruder energy |
| | 568.1 | Article placement or removal (e.g., anti-theft) |
| | 568.2 | Signal-carrying conduit between sensor and article (e.g., cable, power cord, or data link) |
| | 568.5 | Shopping cart or item thereon |
| | 568.6 | Sporting equipment (e.g., golfbag, club, cart, or skis) |
| | 568.7 | Currency, credit card, or container therefor (e.g., wallet or handbag) |
| | 568.8 | Article on pedestal, in display case, or mounted on wall (e.g., work of art) |
| | 569 | Mailbox |
| | 570 | Drawer |
| | 571 | Alarm on protected article |
| | 572.1 | Detectable device on protected article (e.g., "tag") |
| | 572.2 | Specified relationship between field and detection frequencies (e.g., nth order harmonics) |
| | 572.3 | Deactivatable by means other than mere removal |
| | 572.4 | Specified processing arrangement for detected signal |
| | 572.5 | Having tuned resonant circuit |
| | 572.6 | Having "soft" magnetic element (e.g., Permalloy) |
| | 572.7 | Specified antenna structure |
| | 572.8 | Specified device housing or attachment means |
| | 573.1 | Human or animal |
| | 574 | Holdup |
| | 575 | Sleep |
| | 576 | Drive capability |
| | 573.2 | Nondomestic animal (e.g., for hunting, fishing, or repelling) |
| | 573.3 | Domestic animal training, monitoring, or controlling |
| | 573.4 | House arrest system, wandering, or wrong place |
| | 573.5 | Incontinence or enuresis alarm |
| | 573.6 | Water safety alarm |
| | 573.7 | Posture alarm |
| | 577 | Flame |
| | 580 | Ice formation |
| | 584 | Thermal |
| | 585 | Refrigerated storage |
| | 586 | Portable |
| | 587 | False alarm resistant |
| | 588 | Time-temperature relationship (e.g., overtemperature exceeds predetermined interval or time-temperature integral) |
| | 590 | Fusible, frangible, or destructible sensor |
| | 592 | Expanding fluid sensor |
| | 593 | Switch sensor |
| | 595 | Current modifier or generator |
| | 600 | Radiant energy |
| | 601 | Meteorological condition |
| | 603 | Fluent material |
| | 604 | Wetness |
| | 605 | Leakage |
| | 606 | Flow rate |
| | 612 | Material level |
| | 613 | Weight in container |
| | 614 | Pressure |
| | 615 | Moving sensor (e.g., impeller) |
| | 616 | Overflow |
| | 617 | Pulverant material (e.g., bin) |
| | 618 | Liquid |
| | 626 | Pressure |
| | 627 | Particle suspension in fluid |
| | 632 | Gas |
| | 635 | Condition of electrical apparatus |
| | 636.1 | Battery |
| | 636.11 | By change or rate of change of impedance or admittance |
| | 636.12 | By current and voltage |
| | 636.13 | By current |
| | 636.15 | By voltage |
| | 636.16 | Having load detail |
| | 636.17 | Having overcharge detection or protection |
| | 636.19 | Battery deterioration detection |
| | 636.2 | Including charging circuit |
| | 636.21 | Wet cell type |
| | 637 | Watt-hour meter |
| | 638 | Fuse or circuit breaker |
| | 640 | Heater element |
| | 641 | Signalling light element |
| | 644 | Switch or relay |
| | 645 | Rectifier |
| | 646 | Transformer |
| | 647 | Insulation |
| | 648 | Motor |
| | 649 | Condition of intentional grounding circuit |
| | 650 | Undesired circuit ground or short |
| | 652 | Breaking of circuit continuity |
| | 653 | Electronic circuit or component |
| | 654 | Circuit energization |
| | 657 | Electrical characteristic |
| | 665 | Force or stress |
| | 669 | Acceleration |
| | 670 | Velocity |
| | 673 | Article transport |
| | 678 | Of geometrical gauge |
| | 679 | Machine condition |
| | 686.1 | Position responsive |
| | 691.1 | Specified indicator structure |
| | 691.2 | Simulated effect |
| | 691.3 | Degree or urgency |
| | 691.4 | Plural |
| | 691.6 | Information display |
| | 692 | Sound reproducer |
| | 691.7 | Mechanical |
| | 691.8 | Control circuit detail |
| | 693.1 | Specified power supply |
| | 693.2 | Substitute or emergency source (e.g., back-up battery) |
| | 693.3 | Having reduced power consumption (e.g., intermittent power) |
| | 693.4 | Having specified voltage regulator |
| | 693.5 | Specified housing |
| | 1.1 | SELECTIVE |
| | 2.1 | Path selection |
| | 2.2 | Channel selecting matrix |
| | 2.21 | Plural stages |
| | 2.25 | Folded |
| | 2.26 | Having master control element |
| | 2.27 | Plural matrices |
| | 2.28 | Crosspoint switch detail (i.e., specific crosspoint) |
| | 2.4 | Code or pulse responsive |
| | 2.5 | Wiper |
| | 2.6 | Plural stages |
| | 2.7 | Condition of data channel |
| | 2.9 | Spare channel |
| | 2.8 | Data channel selector line |
| | 2.81 | Tree or cascade |
| | 3.1 | Monitoring in addition to control (e.g., supervisory) |
| | 3.2 | Synchronization |
| | 3.3 | Including storage or recording |
| | 3.4 | Quiescent |
| | 3.42 | Control to avoid fault |
| | 3.43 | Fault condition detection |
| | 3.5 | Including addressing |
| | 3.6 | Scanning |
| | 3.7 | Including indicator |
| | 3.8 | Electromechanical relay |
| | 3.9 | Control then monitoring |
| | 4.1 | Communication or control for the handicapped |
| | 4.2 | Synchronizing |
| | 4.3 | Program control |
| | 4.31 | Operator initiated |
| | 4.32 | Download through data network |
| | 4.33 | Download through distribution network |
| | 4.34 | Enable/disable (e.g., kill machine signal, etc.) |
| | 4.35 | Time sequential manner |
| | 4.36 | Machine tool |
| | 4.37 | Of audio system |
| | 4.4 | Audio reproducing system (e.g., by pulse signal, etc.) |
| | 4.5 | Stock quotation |
| | 4.6 | Space allocation (e.g., vehicle seat, hotel reservation, etc.) |
| | 5.1 | Intelligence comparison for controlling |
| | 5.2 | Authorization control (e.g., entry into an area) |
| | 5.21 | Varying authorization |
| | 5.22 | Code programming |
| | 5.26 | Code rotating or scrambling |
| | 5.27 | Rule based input |
| | 5.28 | Timed access blocking |
| | 5.3 | Having indication of improper access |
| | 5.4 | Credit |
| | 5.5 | Input from central location for plural controlled devices |
| | 5.51 | Manual code input |
| | 5.6 | Coded record input (e.g., IC card or key) |
| | 5.61 | Wireless transceiver |
| | 5.64 | Wireless transmitter |
| | 5.65 | Electronic coded record |
| | 5.66 | Magnetic coded record |
| | 5.67 | Mechanical coded record |
| | 5.7 | Access barrier |
| | 5.74 | Access to electrical information |
| | 5.8 | Authentication (e.g., identity) |
| | 5.9 | Commodity (e.g., vending) |
| | 6.1 | Having indication or alarm |
| | 6.11 | Additional to other selective control |
| | 6.12 | Party line |
| | 6.13 | Selection by means of frequency |
| | 6.14 | Selector or indicator, per se |
| | 6.15 | Step-by-step impulse |
| | 6.17 | Amplitude or polarity controlled |
| | 7.1 | Paging to control diverse device |
| | 7.2 | Code responsive (i.e., paging) |
| | 7.21 | Two-way paging |
| | 7.24 | Transmitting configuration |
| | 7.28 | Paging terminal (i.e., element prior to the transmitter) |
| | 7.32 | Power control or battery saving |
| | 7.39 | Programming the receiver |
| | 7.42 | Frequency scanning for address |
| | 7.43 | Particular message and address format (e.g., POCSAG, FLEX, etc.) |
| | 7.45 | Addressing format |
| | 7.5 | Distress signal |
| | 7.51 | Message presentation |
| | 7.52 | Storing or retrieving message (e.g., received message database handling) |
| | 7.53 | Canned message (audible or visual) |
| | 7.54 | Via externally coupled device |
| | 7.55 | Display |
| | 7.57 | Audible |
| | 7.58 | Alert |
| | 7.63 | Housing detail |
| | 8.1 | Location indication |
| | 9.1 | Addressing |
| | 9.11 | Group addressing |
| | 9.12 | Asynchronous |
| | 9.15 | Including source address |
| | 9.16 | Programming of the address |
| | 9.17 | Plural part (e.g., digit, etc.) or repetitions |
| | 10.1 | Interrogation response |
| | 10.2 | Contention avoidance |
| | 10.3 | Interrogation signal detail |
| | 10.4 | Response signal detail |
| | 10.5 | Additional control |
| | 10.6 | Printout or display |
| | 11.1 | With multidigit encoder |
| | 12.1 | Pulse responsive actuation |
| | 12.11 | Phase or frequency shift keying |
| | 12.12 | Polarity |
| | 12.13 | Pulse pairs |
| | 12.14 | Having delay line |
| | 12.15 | Serial |
| | 12.16 | Pulse width |
| | 12.17 | Pulse spacing (e.g., pulse repetition rate, etc.) |
| | 12.18 | Counting |
| | 12.21 | Shift register |
| | 12.22 | Remote control |
| | 12.23 | Programming |
| | 12.24 | Operator initiated |
| | 12.25 | Download through data network |
| | 12.26 | Download through distribution network |
| | 12.27 | Enable/disable (e.g., kill machine signal, etc.) |
| | 12.28 | Programming a controller |
| | 12.29 | Programming an appliance |
| | 12.3 | Diverse delivery media (e.g., wired and wireless, etc.) |
| | 12.31 | Wired |
| | 12.32 | Power line (PLC) |
| | 12.33 |  Modulation technique |
| | 12.34 | Noise reduction (e.g., filtering, etc.) |
| | 12.36 | Impedance matching (e.g., Y-match or delta match, etc.) |
| | 12.37 | Bi-directional (e.g., with transceiver, etc.) |
| | 12.38 | With inductive coupling (e.g., transformer or torroid, etc.) |
| | 12.39 | With coupling plug |
| | 12.4 | Data network |
| | 12.5 | Radio |
| | 12.52 | Plural devices |
| | 12.54 | Indicator or display |
| | 12.55 | Housing or casing |
| | 13.1 | Phase responsive actuation |
| | 13.2 | Frequency responsive actuation |
| | 13.21 | Programming |
| | 13.22 | Diverse delivery media (e.g., wired and wireless, etc.) |
| | 13.23 | Power line (PLC) |
| | 13.24 | Wireless link |
| | 13.33 | Plural frequencies |
| | 13.37 | Amplitude responsive actuation |
| | 14.1 | Decoder matrix |
| | 14.2 | Plural stage |
| | 14.3 | Programmable |
| | 14.4 | Logic crosspoint |
| | 14.5 | Bistable crosspoint |
| | 14.6 | Semiconductor crosspoint |
| | 15.1 | Having electron beam device |
| | 16.1 | System having rectifier |
| | 286.01 | SYSTEMS |
| | 286.02 | Network signaling |
| | 286.04 | Manual alarm telegraph; e.g., other than signal box type |
| | 286.06 | Call station |
| | 286.11 | Annunciator |
| | 286.13 | Mimic |
| | 287 | Signal box type (e.g., to call messenger, plural fire alarm boxes) |
| | 288 | Combined (e.g., alarm circuit over power line) |
| | 289 | With fire extinguisher (e.g., CO2) |
| | 290 | Engine house apparatus controlling (e.g., releases horses, starts motor) |
| | 291 | Repeaters (e.g., from central to plural fire houses or to siren) |
| | 292 | Circuit maintenance (e.g., fault alarm, faulty circuit substitution) |
| | 293 | Variable signal (e.g., police and fire, first and third alarm) |
| | 295 | Noninterfering (prevents break-in by another box during transmission) |
| | 297 | With signal at box (e.g., preliminary signal to combat false alarms) |
| | 298 | Answer back signal acknowledges transmitted signal |
| | 299 | Simultaneous (e.g., actuated by transmitted signal) |
| | 300 | Lamp at box (e.g., to call patrolman) |
| | 301 | Portable box actuating key (e.g., key must be released by signal from central) |
| | 303 | Frangible element must be broken to send signal |
| | 304 | False alarm combating (e.g., detention devices) |
| | 305 | Local circuit to actuate box |
| | 307 | Transmitters |
| | 309.16 | Timer control |
| | 309.2 | With nonelectrical indicator or exhibitor |
| | 309.3 | With diversely controlled indicator |
| | 309.4 | Selectively or sequentially actuated indicators |
| | 309.6 | Circuit maker-breaker in series |
| | 309.7 | Reminder device with built-in timer |
| | 309.8 | Separate diverse device activated by timer |
| | 309.9 | Separate diverse device deactivated by timer |
| | 311.2 | Nonselective paging (e.g., public address system) |
| | 313 | Answer back |
| | 315 | Selsyn type |
| | 316 | Rebalancing at receiver |
| | 318 | Synchronous distributor at transmitter and receiver |
| | 319 | Plural electromagnets or plural motors receiver |
| | 320 | Via fluid conduit (e.g., fire hose) |
| | 321 | Portable self-contained (e.g., movie usher's signalling flashlight) |
| | 322 | Self-cancelling after fixed time |
| | 323R | Game reporting |
| | 326 | Plural (e.g., concurrent auxiliary) single indications (e.g., light flashes when bell rings) |
| | 328 | Audible signals (e.g., bell rings softly first and then loudly) |
| | 330 | In and out indicators (e.g., doorbell button flashes "out" sign) |
| | 331 | Periodic or flashing |
| | 332 | Signal light systems |
| | 333 | With specific power supply (e.g., power substitution) |
| | 425.1 | REPEATER IN UNSPECIFIED TYPE COMMUNICATIONS LINE OR CHANNEL (E.G., RELAY STATION) |
| | 407.1 | TACTUAL INDICATION |
| | 815.4 | VISUAL INDICATION |
| | 815.41 | False signal prevention (anti-sunlight) |
| | 815.42 | Having light piping |
| | 815.44 | Seven-segment indicator |
| | 815.45 | Using light emitting diodes |
| | 815.46 | Audio responsive lamp |
| | 815.47 | Switchboard or panel type (e.g., bullseye) |
| | 815.53 | Lighted alphanumeric or character indicator matrix |
| | 815.55 | Transparent or translucent indicator with means for blocking light |
| | 815.58 | Step by step positioner |
| | 815.62 | Electromagnetic actuator for indicator matrix |
| | 815.63 | Binary indicator |
| | 815.64 | Electromagnetic rotator for indicator wheel |
| | 815.65 | Multiple colors |
| | 815.69 | Diverse indications |
| | 815.7 | Having percussion type indication (e.g., electric bells, chimes) |
| | 815.72 | Having pneumatic type indication |
| | 815.73 | With lamp enclosed in transparent housing |
| | 815.78 | Pointer indicator |
| | 815.81 | Grouped drop annunciators |
| | 815.83 | Movable |
| | 384.1 | AUDIBLE INDICATION |
| | 384.2 | Ultrasonic pest control |
| | 384.3 | Simulation |
| | 384.4 | Electronic siren (e.g., wail tone or yelp tone warning device) |
| | 384.5 | With computer element |
| | 384.6 | Piezoelectric |
| | 384.7 | Electronic |
| | 385.1 | Explosive |
| | 387.1 | Weatherproofing |
| | 388.1 | Diaphragm (e.g., horn or buzzer) |
| | 390.1 | Rotary actuator |
| | 388.2 | Alternating current |
| | 388.3 | With auxiliary flexible membrane |
| | 388.4 | With resonance chamber |
| | 388.5 | Armature support |
| | 388.7 | Interrupter |
| | 391.1 | Housing or mounting |
| | 392.1 | Percussion-type sound producer (e.g., signal chimes or bells) |
| | 392.2 | Rotary actuator |
| | 393.1 | Plural armatures |
| | 393.2 | Battery operated |
| | 393.3 | Pushbutton |
| | 393.4 | Including timer |
| | 392.3 | Volume control |
| | 401.1 | Alternating current |
| | 398.1 | Nonelectrical driving means (e.g., spring or weight) |
| | 392.4 | Tubular sound producer (e.g., signal chimes) |
| | 392.5 | Resonator (e.g., signal chimes) |
| | 395.1 | Suspended (e.g., locomotive bell) |
| | 397.1 | Armature support |
| | 397.3 | Interrupter |
| | 397.5 | Polarized |
| | 396.1 | Housing or mounting |
| | 404.1 | Pneumatic-type sound producer (e.g., whistle or siren) |
| | 999 | 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. | ||
| VEHICLE POSITION INDICATION (340/988) |
| LAND VEHICLE ALARM OR INDICATOR (340/425.5) |
| CONDITION RESPONSIVE INDICATING SYSTEM (340/500) |
| With particular coupling link (340/531) |
| Specific condition (340/540) |
| Intrusion detection (340/541) |
| FOR101 | Article placement or removal (340/568) |
| FOR103 | Human or animal (340/573) |
| Condition of electrical apparatus (340/635) |
| FOR104 | Position responsive (340/686) |
| FOR105 | Specified indicator structure (340/691) |
| FOR106 | Specified power supply or housing (340/693) |
| SELECTIVE (340/825) |
| FOR203 | Channel selection (340/825.03) |
| FOR326 | Plural stage matrix system (e.g., path finding) (340/826) |
| FOR204 | Code or pulse responsive (340/825.04) |
| FOR107 | Loop (340/825.05) |
| FOR206 | Monitoring and control (e.g., supervisory) (340/825.06) |
| FOR207 | Having addressing (340/825.07) |
| FOR209 | Quiescent (340/825.09) |
| FOR210 | Scanning (340/825.1) |
| FOR214 | Synchronization (340/825.14) |
| FOR215 | Having storage or recording (340/825.15) |
| FOR216 | Fault condition (340/825.16) |
| FOR217 | Having indicator (340/825.17) |
| FOR218 | Relay (340/825.18) |
| FOR110 | Intelligence comparison (340/825.3) |
| FOR311 | SYSTEM WITH RECEIVER SELECTION (455/31.1) |
| FOR312 | Control of selectively responsive paging arrangement over telephone line (379/FOR 102) |
| FOR321 | Receiver scans for address signal (455/32.1) |
| FOR381 | Coded sequence (455/38.1) |
| SELECTIVE (340/825) |
| Having indication or alarm (e.g., location indication) (340/825.36) |
| FOR108 | Interrogation response (340/825.54) |
| FOR279 | Matrix (340/825.79) |
| FOR280 | Plural stage (340/825.8) |
| FOR281 | Electroluminescent elements (340/825.81) |
| FOR283 | Programmable (340/825.83) |
| FOR285 | Semiconductor crosspoint (340/825.85) |
| FOR286 | Integrated circuit (340/825.86) |
| FOR287 | Logic (340/825.87) |
| FOR288 | Bistable (340/825.88) |
| FOR289 | Switching element (340/825.89) |
| FOR290 | Transistor (340/825.9) |
| FOR291 | Field effect transistor (340/825.91) |
| FOR292 | Four or more electrodes (340/825.92) |
| FOR293 | Plural (340/825.93) |
| FOR294 | Diode (340/825.94) |
| SYSTEMS (340/286.01) |
| FOR404 | Timer controlled (340/309.15) |
| FOR301 | Paging (340/311.1) |
| FOR405 | Signal over power line (340/310.01) |
| FOR406 | Modulation technique (340/310.02) |
| FOR407 | Noise reduction (e.g., filtering) (340/310.03) |
| FOR409 | Impedance matching (e.g., Y-match or delta match) (340/310.05) |
| FOR410 | Bidirectional (e.g., with transceiver) (340/310.06) |
| FOR411 | With inductive coupling (e.g., transformer or torrid) (340/310.07) |
| FOR412 | With coupling plug (340/310.08) |
| SELECTIVE (340/825) |
| FOR415 | SELECTIVE (340/825) |
| FOR416 | Spare channel (340/825.01) |
| FOR417 | Tree or cascade (340/825.02) |
| FOR418 | Communication or control for the handicapped (340/825.19) |
| FOR419 | Synchronizing (340/825.2) |
| FOR421 | Program control (340/825.22) |
| FOR424 | Audio system (e.g., by pulse signal) (340/825.25) |
| FOR425 | Stock quotation (340/825.26) |
| FOR427 | Space allocation (e.g., vehicle seat, hotel reservation) (340/825.28) |
| FOR429 | Having indication or alarm (e.g., location indication) (340/825.36) |
| FOR430 | Additional to other selective control (340/825.37) |
| FOR431 | Party line (340/825.38) |
| FOR432 | Selection by means of frequency (340/825.39) |
| FOR433 | Selector or indicator, per se (340/825.4) |
| FOR434 | Step-by-step impulse (340/825.41) |
| FOR436 | Amplitude or polarity controlled (340/825.43) |
| FOR437 | Location indication (340/825.49) |
| FOR438 | Addressing (340/825.52) |
| FOR440 | With multidigit encoder (340/825.56) |
| FOR441 | Pulse responsive actuation (340/825.57) |
| FOR442 | Phase or frequency shift keying (340/825.58) |
| FOR443 | Polarity (340/825.59) |
| FOR444 | Pulse pairs (340/825.6) |
| FOR445 | Having delay line (340/825.61) |
| FOR446 | Serial (340/825.62) |
| FOR454 | Phase responsive actuation (340/825.7) |
| FOR455 | Frequency responsive actuation (340/825.71) |
| FOR461 | Amplitude responsive actuation (340/825.77) |
| FOR463 | Having electron beam device (340/825.97) |
| FOR464 | System having rectifier (340/825.98) |
| FOR465 | REMOTE CONTROL OVER POWER LINE (340/310.11) |
| FOR466 | Modulation technique (340/310.12) |
| FOR467 | Noise reduction (e.g., filtering) (340/310.13) |
| FOR469 | Impedance matching (e.g., Y-match or delta match) (340/310.15) |
| FOR470 | Bi-directional (e.g., with transceiver) (340/310.16) |
| FOR471 | With inductive coupling (e.g., transformer or torroid) (340/310.17) |
| FOR472 | With coupling plug (340/310.18) |
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