Communications: Electrical Patents (Class 340)
- Diagnostic monitoring or detecting operation of communications equipment or signal (Class 340/853.2)
- Selective control of subsurface equipment (Class 340/853.3)
- Repeater in subsurface link (e.g., cable, etc.) (Class 340/853.7)
- With orientation sensing of subsurface telemetering equipment (other than drilling equipment) (Class 340/853.8)
- Including detail of subsurface signal storage (e.g., memory, recorder, register, etc.) (Class 340/853.9)
- With position or depth recording (e.g., line payout, equipment locator, etc.) (Class 340/854.1)
- Using a specific transmission medium (e.g., conductive fluid, annular spacing, etc.) (Class 340/854.3)
- Multiplexed signals (Class 340/855.3)
- Pulse or digital signal transmission (Class 340/855.4)
- Modification of signal bandwidth, frequency, or circuit impedance at subsurface location (Class 340/855.7)
- Including specified power transmission feature or source (e.g., battery, etc.) (Class 340/855.8)
- In horizontal or inclined passage arrangement (Class 340/856.1)
- With expandable or inflatable sensor element or mounting (Class 340/856.2)
- Including particular sensor (Class 340/856.3)
- With meter reading (Class 340/870.02)
- With calibration (Class 340/870.04)
- With calculation (Class 340/870.05)
- Combined (TM system with other system) (Class 340/870.07)
- For radio sonde (Class 340/870.1)
- Plural transmitters (Class 340/870.11)
- Condition responsive (Class 340/870.16)
- Using a particular modulation (e.g., phase, frequency, or amplitude) (Class 340/870.18)
- Phase variation (Class 340/870.25)
- Frequency variation (Class 340/870.26)
- Plural circuits, each for particular magnitude (Class 340/870.27)
- Via radiant energy beam (via particular energy) (Class 340/870.28)
- With particular transmitter (e.g., piezoelectric, dynamo) (Class 340/870.3)
- With supply voltage regulation or compensation (Class 340/870.39)
- With particular receiver (e.g., ratiometer) (Class 340/870.4)
- Portable (Class 340/908)
- Plural intersections under common central station control (Class 340/909)
- Intersection normally under local controller (Class 340/916)
- Combined (e.g., toll systems, one-way) (Class 340/928)
- Indication of time remaining before change of phase (Class 340/929)
- Traffic control or local controller failure indicator (Class 340/931)
- Pacing (e.g., vehicle keeps pace with sequentially activated lights) (Class 340/932)
- Pivoted (Class 340/932.1)
- Density (Class 340/934)
- Discriminates vehicle direction (Class 340/935)
- Speed and overspeed (Class 340/936)
- With camera (Class 340/937)
- Compensation for vehicle remaining at sensor position (Class 340/938)
- Environmental or drift compensation (Class 340/939)
- With pneumatic (Class 340/940)
- Inductive (Class 340/941)
- Photoelectric (Class 340/942)
- Sonic or ultrasonic (Class 340/943)
- Nonairplane (e.g., balloon or helicopter) (Class 340/946)
- Land-based landing guidance (Class 340/947)
- Docking guidance (Class 340/958)
- Takeoff indicator (Class 340/959)
- Landing gear indicator (Class 340/960)
- Potential collision with other aircraft (Class 340/961)
- Icing indicator (Class 340/962)
- Flight alarm (Class 340/963)
- Nonalarm flight indicator (Class 340/971)
- Aircraft beacons (Class 340/981)
- Obstruction beacon (Class 340/983)
- Of burglary or unauthorized use (Class 340/426.1)
- For trailer (Class 340/431)
- For bicycle (Class 340/432)
- For school bus (Class 340/433)
- For taxi (Class 340/434)
- Of relative distance from an obstacle (Class 340/435)
- Of collision or contact with external object (Class 340/436)
- Internal alarm or indicator responsive to a condition of the vehicle (Class 340/438)
- External alarm or indicator of movement (Class 340/463)
- External signal light system (Class 340/468)
- Electromagnetically actuated mechanical signal (Class 340/480)
- Path selection (Class 340/2.1)
- Monitoring in addition to control (e.g., supervisory) (Class 340/3.1)
- Communication or control for the handicapped (Class 340/4.1)
- Synchronizing (Class 340/4.2)
- Program control (Class 340/4.3)
- Audio reproducing system (e.g., by pulse signal, etc.) (Class 340/4.4)
- Stock quotation (Class 340/4.5)
- Space allocation (e.g., vehicle seat, hotel reservation, etc.) (Class 340/4.6)
- Intelligence comparison for controlling (Class 340/5.1)
- Having indication or alarm (Class 340/6.1)
- Addressing (Class 340/9.1)
- Interrogation response (Class 340/10.1)
- With multidigit encoder (Class 340/11.1)
- Pulse responsive actuation (Class 340/12.1)
- Phase responsive actuation (Class 340/13.1)
- Frequency responsive actuation (Class 340/13.2)
- Amplitude responsive actuation (Class 340/13.37)
- Decoder matrix (Class 340/14.1)
- Having electron beam device (Class 340/15.1)
- System having rectifier (Class 340/16.1)
- Network signaling (Class 340/286.02)
- Manual alarm telegraph; e.g., other than signal box type (Class 340/286.04)
- Call station (Class 340/286.06)
- Annunciator (Class 340/286.11)
- Mimic (Class 340/286.13)
- Signal box type (e.g., to call messenger, plural fire alarm boxes) (Class 340/287)
- Timer control (Class 340/309.16)
- Nonselective paging (e.g., public address system) (Class 340/311.2)
- Answer back (Class 340/313)
- Selsyn type (Class 340/315)
- Rebalancing at receiver (Class 340/316)
- Synchronous distributor at transmitter and receiver (Class 340/318)
- Plural electromagnets or plural motors receiver (Class 340/319)
- Via fluid conduit (e.g., fire hose) (Class 340/320)
- Portable self-contained (e.g., movie usher's signalling flashlight) (Class 340/321)
- Self-cancelling after fixed time (Class 340/322)
- Game reporting (Class 340/323R)
- Plural (e.g., concurrent auxiliary) single indications (e.g., light flashes when bell rings) (Class 340/326)
- Audible signals (e.g., bell rings softly first and then loudly) (Class 340/328)
- In and out indicators (e.g., doorbell button flashes "out" sign) (Class 340/330)
- Periodic or flashing (Class 340/331)
- Signal light systems (Class 340/332)
- With specific power supply (e.g., power substitution) (Class 340/333)
- False signal prevention (anti-sunlight) (Class 340/815.41)
- Having light piping (Class 340/815.42)
- Seven-segment indicator (Class 340/815.44)
- Using light emitting diodes (Class 340/815.45)
- Audio responsive lamp (Class 340/815.46)
- Switchboard or panel type (e.g., bullseye) (Class 340/815.47)
- Lighted alphanumeric or character indicator matrix (Class 340/815.53)
- Transparent or translucent indicator with means for blocking light (Class 340/815.55)
- Step by step positioner (Class 340/815.58)
- Electromagnetic actuator for indicator matrix (Class 340/815.62)
- Binary indicator (Class 340/815.63)
- Electromagnetic rotator for indicator wheel (Class 340/815.64)
- Multiple colors (Class 340/815.65)
- Diverse indications (Class 340/815.69)
- With lamp enclosed in transparent housing (Class 340/815.73)
- Pointer indicator (Class 340/815.78)
- Grouped drop annunciators (Class 340/815.81)
- Movable (Class 340/815.83)
- Ultrasonic pest control (Class 340/384.2)
- Simulation (Class 340/384.3)
- Electronic siren (e.g., wail tone or yelp tone warning device) (Class 340/384.4)
- With computer element (Class 340/384.5)
- Piezoelectric (Class 340/384.6)
- Electronic (Class 340/384.7)
- Explosive (Class 340/385.1)
- Weatherproofing (Class 340/387.1)
- Diaphragm (e.g., horn or buzzer) (Class 340/388.1)
- Percussion-type sound producer (e.g., signal chimes or bells) (Class 340/392.1)
- Pneumatic-type sound producer (e.g., whistle or siren) (Class 340/404.1)
Foreign Patent Art Collections
Foreign Patent Art Collections
Foreign Patent Art Collections
- Spare channel (340/825.01) (Class 340/FOR416)
- Tree or cascade (340/825.02) (Class 340/FOR417)
- Communication or control for the handicapped (340/825.19) (Class 340/FOR418)
- Synchronizing (340/825.2) (Class 340/FOR419)
- Program control (340/825.22) (Class 340/FOR421)
- Audio system (e.g., by pulse signal) (340/825.25) (Class 340/FOR424)
- Stock quotation (340/825.26) (Class 340/FOR425)
- Space allocation (e.g., vehicle seat, hotel reservation) (340/825.28) (Class 340/FOR427)
- Having indication or alarm (e.g., location indication) (340/825.36) (Class 340/FOR429)
- Addressing (340/825.52) (Class 340/FOR438)
- With multidigit encoder (340/825.56) (Class 340/FOR440)
- Pulse responsive actuation (340/825.57) (Class 340/FOR441)
- Phase responsive actuation (340/825.7) (Class 340/FOR454)
- Frequency responsive actuation (340/825.71) (Class 340/FOR455)
- Amplitude responsive actuation (340/825.77) (Class 340/FOR461)
- Having electron beam device (340/825.97) (Class 340/FOR463)
- System having rectifier (340/825.98) (Class 340/FOR464)
- Modulation technique (340/310.12) (Class 340/FOR466)
- Noise reduction (e.g., filtering) (340/310.13) (Class 340/FOR467)
- Impedance matching (e.g., Y-match or delta match) (340/310.15) (Class 340/FOR469)
- Bi-directional (e.g., with transceiver) (340/310.16) (Class 340/FOR470)
- With inductive coupling (e.g., transformer or torroid) (340/310.17) (Class 340/FOR471)
- With coupling plug (340/310.18) (Class 340/FOR472)