SPX Technologies Inc
SPX TechnoActive Patents
0
Total Holdings
219
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| EP0037663A2 | Method and apparatus for positioning a wafer on a flat bed | Expired / Lapsed | 1981-03-19 | — | 26 | Details |
| DE2314075A1 | MULTI-COMPUTER VEHICLE CONTROL SYSTEM WITH VALIDITY MEANS | Expired / Lapsed | 1973-03-21 | — | 0 | Details |
| US6679098B2 | High flow rate sample flow path assembly for electronic gas… | Expired / Lapsed | 2002-02-25 | 2004-01-20 | 24 | Details |
| US5916286A | Portable automobile diagnostic tool | Expired / Lapsed | 1995-09-15 | 1999-06-29 | 29 | Details |
| US5014227A | Caster and steering axis inclination measurement technique | Expired / Lapsed | 1989-07-17 | 1991-05-07 | 27 | Details |
| US4506253A | Supervisory and control circuit for alarm system | Expired / Lapsed | 1983-01-03 | 1985-03-19 | 17 | Details |
| US4375047A | Torque compensated electrical motor | Expired / Lapsed | 1981-07-23 | 1983-02-22 | 19 | Details |
| US4160680A | Vacuum carburizing | Expired / Lapsed | 1978-04-18 | 1979-07-10 | 13 | Details |
| US4147002A | Light valve system and greenhouse utilizing the same | Expired / Lapsed | 1977-02-14 | 1979-04-03 | 21 | Details |
| US4092010A | Variable fluid passage | Expired / Lapsed | 1976-10-12 | 1978-05-30 | 27 | Details |
| US4020989A | Light transmitting building panel | Expired / Lapsed | 1975-10-20 | 1977-05-03 | 8 | Details |
| US4012727A | Alarm control system | Expired / Lapsed | 1975-05-21 | 1977-03-15 | 15 | Details |
| US3964566A | System for providing auxiliary power | Expired / Lapsed | 1975-07-21 | 1976-06-22 | 33 | Details |
| US3901577A | Grounding clamps and connectors therefor | Expired / Lapsed | 1974-01-25 | 1975-08-26 | 10 | Details |
| US3851196A | Plural axis linear motor structure | Expired / Lapsed | 1973-04-05 | 1974-11-26 | 24 | Details |
| US3836835A | Multi axes linear movement positioning system | Expired / Lapsed | 1971-04-19 | 1974-09-17 | 34 | Details |
| US3814840A | Igital switching technique for use on communications circui… | Expired / Lapsed | 1972-05-08 | 1974-06-04 | 13 | Details |
| US3814839A | Remote digital switching technique for use on communication… | Expired / Lapsed | 1972-05-08 | 1974-06-04 | 21 | Details |
| US3808366A | Binary data transmission system | Expired / Lapsed | 1972-12-11 | 1974-04-30 | 18 | Details |
| US3783178A | Expansion joint for connecting rigid conduit with grounding… | Expired / Lapsed | 1972-08-03 | 1974-01-01 | 10 | Details |
| US3763380A | Method and apparatus for measuring rates of random pulses | Expired / Lapsed | 1971-05-05 | 1973-10-02 | 16 | Details |
| US3751127A | Modular instrument housing | Expired / Lapsed | 1970-09-10 | 1973-08-07 | 20 | Details |
| US3639753A | System for governing the speed of railway vehicles | Expired / Lapsed | 1969-09-15 | 1972-02-01 | 6 | Details |
| US3620248A | Backpressure device | Expired / Lapsed | 1970-07-20 | 1971-11-16 | 7 | Details |
| US3597606A | Warning-light housing | Expired / Lapsed | 1969-01-03 | 1971-08-03 | 14 | Details |
| US3588824A | Spare channel system for sectionalizing a communication lin… | Expired / Lapsed | 1969-09-04 | 1971-06-28 | 0 | Details |
| US3588825A | Digital commaless code remote control system | Expired / Lapsed | 1968-10-02 | 1971-06-28 | 0 | Details |
| US3580055A | Tank system tightness tester | Expired / Lapsed | 1968-10-25 | 1971-05-25 | 18 | Details |
| US3575604A | Motion control on doors of rapid transit cars | Expired / Lapsed | 1969-09-17 | 1971-04-20 | 7 | Details |
| US3538325A | Performance level control of vehicles from a central office | Expired / Lapsed | 1968-05-16 | 1970-11-03 | 0 | Details |
| US3482090A | Frequency responsive train speed control apparatus | Expired / Lapsed | 1967-12-06 | 1969-12-02 | 0 | Details |
| US3482046A | Non-synchronous radio communication system and method | Expired / Lapsed | 1963-04-04 | 1969-12-02 | 2 | Details |
| US3465276A | Negative feedback circuit employing combination amplifier a… | Expired / Lapsed | 1967-09-06 | 1969-09-02 | 0 | Details |
| US3418547A | Step-servocontroller | Expired / Lapsed | 1965-03-22 | 1968-12-24 | 0 | Details |
| US3414878A | Traffic signal lamp control circuit | Expired / Lapsed | 1965-12-17 | 1968-12-03 | 0 | Details |
| US3403382A | Code communication system with control of remote units | Expired / Lapsed | 1965-06-08 | 1968-09-24 | 0 | Details |
| US3403381A | System for radio communication by asynchronous transmission… | Expired / Lapsed | 1965-02-05 | 1968-09-24 | 0 | Details |
| US3383653A | Modular traffic signal controller | Expired / Lapsed | 1965-12-21 | 1968-05-14 | 2 | Details |
| US3377855A | Noise nulling network for magnetic flowmeter | Expired / Lapsed | 1966-06-29 | 1968-04-16 | 2 | Details |
| US3377616A | Vehicle identification system | Expired / Lapsed | 1964-04-27 | 1968-04-09 | 0 | Details |
| US3376547A | Parking area scanning system | Expired / Lapsed | 1964-10-20 | 1968-04-02 | 0 | Details |
| US3374340A | Computation of parameters for traffic control systems | Expired / Lapsed | 1963-07-03 | 1968-03-19 | 2 | Details |
| US3363096A | Control system for vehicles | Expired / Lapsed | 1965-10-23 | 1968-01-09 | 1 | Details |
| US3360776A | Code communication system | Expired / Lapsed | 1963-04-12 | 1967-12-26 | 2 | Details |
| US3358126A | Traffic signal controller cycle computer | Expired / Lapsed | 1963-09-03 | 1967-12-12 | 2 | Details |
| US3345503A | Traffic parameter computer which measures the ratio of traf… | Expired / Lapsed | 1963-08-29 | 1967-10-03 | 2 | Details |
| US3340508A | Normally inactive supervisory control system with designate… | Expired / Lapsed | 1963-11-26 | 1967-09-05 | 2 | Details |
| US3336577A | Telemetering system | Expired / Lapsed | 1963-07-15 | 1967-08-15 | 2 | Details |
| US3329932A | Ultrasonic vehicle detection system | Expired / Lapsed | 1964-07-22 | 1967-07-04 | 2 | Details |
| US3313933A | Integrity check for hot box detector | Expired / Lapsed | 1962-09-19 | 1967-04-11 | 2 | Details |
| US3307146A | Offset selector | Expired / Lapsed | 1964-03-26 | 1967-02-28 | 2 | Details |
| US3304539A | Freeway access ramp traffic control | Expired / Lapsed | 1965-10-15 | 1967-02-14 | 2 | Details |
| US3303470A | Central to remote signalling system having roll call interr… | Expired / Lapsed | 1962-06-07 | 1967-02-07 | 2 | Details |
| US3284627A | Vehicle control system | Expired / Lapsed | 1962-09-05 | 1966-11-08 | 2 | Details |
| US3281782A | Traffic signal controller | Expired / Lapsed | 1964-01-17 | 1966-10-25 | 2 | Details |
| US3278896A | Traffic signal controller offset computer | Expired / Lapsed | 1963-09-03 | 1966-10-11 | 2 | Details |
| US3268862A | Code communication system | Expired / Lapsed | 1961-10-02 | 1966-08-23 | 2 | Details |
| US3233212A | Vehicle detection and speed measuring apparatus | Expired / Lapsed | 1961-04-12 | 1966-02-01 | 2 | Details |
| US3219815A | Interlocking system for railroads | Expired / Lapsed | 1960-11-03 | 1965-11-23 | 2 | Details |
| US3218456A | Control system for trains | Expired / Lapsed | 1965-06-18 | 1965-11-16 | 2 | Details |
| US3184969A | Liquid level indication system | Expired / Lapsed | 1963-06-10 | 1965-05-25 | 2 | Details |
| US3177359A | Journal temperature information recording system for trains | Expired / Lapsed | 1961-05-16 | 1965-04-06 | 2 | Details |
| US3112908A | Centralized zone control system | Expired / Lapsed | 1958-04-24 | 1963-12-03 | 1 | Details |
| US3110010A | Traffic directing system for parking areas | Expired / Lapsed | 1961-05-01 | 1963-11-05 | 2 | Details |
| US3109926A | Toll estimation system | Expired / Lapsed | 1961-01-06 | 1963-11-05 | 1 | Details |
| US3110007A | Ultrasonic vehicle detector | Expired / Lapsed | 1959-10-14 | 1963-11-05 | 2 | Details |
| US3102252A | Ultrasonic vehicle detector | Expired / Lapsed | 1960-07-28 | 1963-08-27 | 2 | Details |
| US3099817A | Vehicle performance monitoring system | Expired / Lapsed | 1958-12-19 | 1963-07-30 | 2 | Details |
| US3072785A | Remote control system for vehicles | Expired / Lapsed | 1960-04-21 | 1963-01-08 | 2 | Details |
| US3056121A | Control panel for railway traffic controlling systems | Expired / Lapsed | 1959-05-19 | 1962-09-25 | 0 | Details |
| US3046519A | Ultrasonic vehicle detection system | Expired / Lapsed | 1959-10-28 | 1962-07-24 | 0 | Details |
| US3034100A | Normally inactive multiple station code communication system | Expired / Lapsed | 1959-05-27 | 1962-05-08 | 0 | Details |
| US2955278A | Electronic code communication system | Expired / Lapsed | 1955-02-03 | 1960-10-04 | 0 | Details |
| US2934678A | Electronic shift register | Expired / Lapsed | 1958-11-04 | 1960-04-26 | 0 | Details |
| US2916612A | Railway signaling system with automatic meets between trains | Expired / Lapsed | 1956-12-24 | 1959-12-08 | 0 | Details |
| US2916613A | Posting indicator control system | Expired / Lapsed | 1956-09-26 | 1959-12-08 | 0 | Details |
| US2914662A | Switch and signal control system for railroads | Expired / Lapsed | 1955-09-26 | 1959-11-24 | 0 | Details |
| US2907980A | Multiple station code communication system | Expired / Lapsed | 1953-06-05 | 1959-10-06 | 0 | Details |
| US2874368A | Electronic code communication system | Expired / Lapsed | 1954-08-17 | 1959-02-17 | 0 | Details |
| US2859434A | Speed measuring apparatus for railroad classification yards | Expired / Lapsed | 1955-11-08 | 1958-11-04 | 0 | Details |
| US2838657A | Train speed control system | Expired / Lapsed | 1955-06-17 | 1958-06-10 | 0 | Details |
| US2805335A | Resonant cavity resonator | Expired / Lapsed | 1953-08-19 | 1957-09-03 | 0 | Details |
| US2802199A | Code communication system | Expired / Lapsed | 1955-07-11 | 1957-08-06 | 0 | Details |
| US2794179A | Electronic code communication system | Expired / Lapsed | 1955-12-30 | 1957-05-28 | 0 | Details |
| US2794117A | Combined manual block and train identity system | Expired / Lapsed | 1952-08-28 | 1957-05-28 | 0 | Details |
| US2786938A | Code communication system | Expired / Lapsed | 1951-01-23 | 1957-03-26 | 0 | Details |
| US2768334A | Relay stepping bank | Expired / Lapsed | 1953-01-28 | 1956-10-23 | 0 | Details |
| US2762464A | Train speed control system | Expired / Lapsed | 1954-01-26 | 1956-09-11 | 0 | Details |
| US2748857A | Time element relay | Expired / Lapsed | 1951-11-16 | 1956-06-05 | 0 | Details |
| US2749514A | Electronic testing instrument | Expired / Lapsed | 1951-01-12 | 1956-06-05 | 0 | Details |
| US2731632A | Changeable indicator | Expired / Lapsed | 1952-02-13 | 1956-01-17 | 0 | Details |
| US2719912A | Train speed control system | Expired / Lapsed | 1952-05-24 | 1955-10-04 | 0 | Details |
| US2719911A | Train speed control system | Expired / Lapsed | 1952-05-22 | 1955-10-04 | 0 | Details |
| US2703839A | Coded track circuit signaling system | Expired / Lapsed | 1949-09-08 | 1955-03-08 | 0 | Details |
| US2700728A | Automatic switch control system for classification yards | Expired / Lapsed | 1950-08-15 | 1955-01-25 | 0 | Details |
| US2693525A | Inductive control system | Expired / Lapsed | 1951-01-17 | 1954-11-02 | 0 | Details |
| US2679034A | Code integrity check for centralized traffic control systems | Expired / Lapsed | 1952-02-26 | 1954-05-18 | 0 | Details |
| US2678437A | Air traffic control system | Expired / Lapsed | 1949-04-27 | 1954-05-11 | 0 | Details |
| US2671166A | Radio communications system | Expired / Lapsed | 1950-07-01 | 1954-03-02 | 0 | Details |
| US2662971A | Coded track circuit signaling system | Expired / Lapsed | 1949-07-15 | 1953-12-15 | 0 | Details |
| US2629088A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1950-09-30 | 1953-02-17 | 0 | Details |
| US2626314A | Code communication system | Expired / Lapsed | 1951-08-03 | 1953-01-20 | 0 | Details |
| US2626383A | Station registration in centralized traffic control system … | Expired / Lapsed | 1951-08-03 | 1953-01-20 | 0 | Details |
| US2626382A | Air traffic control system | Expired / Lapsed | 1950-04-13 | 1953-01-20 | 0 | Details |
| US2597818A | Communication system | Expired / Lapsed | 1946-05-09 | 1952-05-20 | 0 | Details |
| US2592788A | Wire terminal and insulating sleeve | Expired / Lapsed | 1948-09-28 | 1952-04-15 | 0 | Details |
| US2588916A | Navigational system for airways traffic control | Expired / Lapsed | 1948-02-02 | 1952-03-11 | 0 | Details |
| US2588930A | Airway traffic control system | Expired / Lapsed | 1947-04-22 | 1952-03-11 | 0 | Details |
| US2588031A | Radio communication system | Expired / Lapsed | 1947-11-01 | 1952-03-04 | 0 | Details |
| US2584739A | Centralized traffic controlling system | Expired / Lapsed | 1948-07-24 | 1952-02-05 | 0 | Details |
| US2570840A | Radio-frequency oscillator organization | Expired / Lapsed | 1946-11-23 | 1951-10-09 | 0 | Details |
| US2559390A | Centralized traffic control system | Expired / Lapsed | 1947-07-03 | 1951-07-03 | 0 | Details |
| US2550859A | Switch and signal control system for railroads | Expired / Lapsed | 1946-05-11 | 1951-05-01 | 0 | Details |
| US2543869A | Centralized traffic controlling system | Expired / Lapsed | 1947-11-12 | 1951-03-06 | 0 | Details |
| US2522055A | Electronic translating device | Expired / Lapsed | 1945-12-31 | 1950-09-12 | 0 | Details |
| US2522029A | Airplane approach control system | Expired / Lapsed | 1945-01-22 | 1950-09-12 | 0 | Details |
| US2515633A | Air traffic control system | Expired / Lapsed | 1949-05-18 | 1950-07-18 | 0 | Details |
| US2501091A | Station selective radio communication system | Expired / Lapsed | 1946-06-26 | 1950-03-21 | 0 | Details |
| US2498807A | Relay housing | Expired / Lapsed | 1948-01-22 | 1950-02-28 | 0 | Details |
| US2490280A | Electromagnetically operated pretensioned contact spring | Expired / Lapsed | 1946-02-09 | 1949-12-06 | 0 | Details |
| US2488815A | Occupancy detecting means for conveyances | Expired / Lapsed | 1946-03-22 | 1949-11-22 | 0 | Details |
| US2484463A | Airway traffic control system | Expired / Lapsed | 1944-06-22 | 1949-10-11 | 0 | Details |
| US2484462A | Airway traffic control system | Expired / Lapsed | 1944-05-25 | 1949-10-11 | 0 | Details |
| US2481780A | Multiple position electrically operated display indicator | Expired / Lapsed | 1945-09-20 | 1949-09-13 | 0 | Details |
| US2480443A | Recorder actuated by electrically heated wires | Expired / Lapsed | 1945-10-03 | 1949-08-30 | 0 | Details |
| US2475221A | Airplane approach control system | Expired / Lapsed | 1948-06-24 | 1949-07-05 | 0 | Details |
| US2469555A | Selective radio communication system for a plurality of sta… | Expired / Lapsed | 1945-06-19 | 1949-05-10 | 0 | Details |
| US2463094A | Airplane course indicating system | Expired / Lapsed | 1944-01-11 | 1949-03-01 | 0 | Details |
| US2459494A | Line circuit communication system | Expired / Lapsed | 1948-01-26 | 1949-01-18 | 0 | Details |
| US2457703A | Plugboard arrangement | Expired / Lapsed | 1946-11-23 | 1948-12-28 | 0 | Details |
| US2456533A | Centralized traffic control system for railroads | Expired / Lapsed | 1945-05-14 | 1948-12-14 | 0 | Details |
| US2448487A | Selective signaling system | Expired / Lapsed | 1945-06-14 | 1948-08-31 | 0 | Details |
| US2446232A | Plug board arrangement | Expired / Lapsed | 1946-08-22 | 1948-08-03 | 0 | Details |
| US2439862A | Airway traffic controlling system | Expired / Lapsed | 1944-03-31 | 1948-04-20 | 0 | Details |
| US2435010A | Continuously checked communication system | Expired / Lapsed | 1944-11-27 | 1948-01-27 | 0 | Details |
| US2425973A | Airplane approach control system | Expired / Lapsed | 1945-06-16 | 1947-08-19 | 0 | Details |
| US2421081A | Tested channel radio communicating system | Expired / Lapsed | 1944-09-06 | 1947-05-27 | 0 | Details |
| US2421106A | Airway traffic control system | Expired / Lapsed | 1943-01-21 | 1947-05-27 | 0 | Details |
| US2410540A | Airway traffic control system | Expired / Lapsed | 1943-11-20 | 1946-11-05 | 0 | Details |
| US2407846A | Radio communication system | Expired / Lapsed | 1945-02-05 | 1946-09-17 | 0 | Details |
| US2399738A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1944-03-29 | 1946-05-07 | 0 | Details |
| US2399777A | Airway traffic control system | Expired / Lapsed | 1943-08-31 | 1946-05-07 | 0 | Details |
| US2399734A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1943-04-27 | 1946-05-07 | 0 | Details |
| US2394215A | Railway switch circuit controller | Expired / Lapsed | 1944-05-03 | 1946-02-05 | 0 | Details |
| US2391991A | Airplane dispatching system | Expired / Lapsed | 1941-12-05 | 1946-01-01 | 0 | Details |
| US2378326A | Carrier frequency communication system | Expired / Lapsed | 1944-07-12 | 1945-06-12 | 0 | Details |
| US2368826A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1942-05-11 | 1945-02-06 | 0 | Details |
| US2344761A | Airway traffic control system | Expired / Lapsed | 1943-06-05 | 1944-03-21 | 0 | Details |
| US2344759A | Airplane dispatching system | Expired / Lapsed | 1942-02-24 | 1944-03-21 | 0 | Details |
| US2302038A | Switch and signal control system for railroads | Expired / Lapsed | 1940-12-26 | 1942-11-17 | 0 | Details |
| US2291372A | Intermittent inductive train control system | Expired / Lapsed | 1941-06-27 | 1942-07-28 | 0 | Details |
| US2285327A | Car retarder for railroads | Expired / Lapsed | 1940-05-06 | 1942-06-02 | 0 | Details |
| US2280420A | Radio telephone system | Expired / Lapsed | 1940-08-21 | 1942-04-21 | 0 | Details |
| US2268240A | Airplane describing system | Expired / Lapsed | 1938-06-04 | 1941-12-30 | 0 | Details |
| US2265257A | Interlocking system for railroads | Expired / Lapsed | 1936-03-20 | 1941-12-09 | 0 | Details |
| US2258122A | Relay | Expired / Lapsed | 1939-01-28 | 1941-10-07 | 0 | Details |
| US2255142A | Interlocking system for railroads | Expired / Lapsed | 1939-09-21 | 1941-09-09 | 0 | Details |
| US2232379A | Flood protection system for railroads | Expired / Lapsed | 1938-09-28 | 1941-02-18 | 0 | Details |
| US2223103A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1938-02-25 | 1940-11-26 | 0 | Details |
| US2217227A | Interlocking system for railroads | Expired / Lapsed | 1937-06-22 | 1940-10-08 | 0 | Details |
| US2201116A | Automatic train control system for railroads | Expired / Lapsed | 1939-01-28 | 1940-05-14 | 0 | Details |
| US2194352A | Car classification system for railroads | Expired / Lapsed | 1938-11-25 | 1940-03-19 | 0 | Details |
| US2176040A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1936-12-30 | 1939-10-10 | 0 | Details |
| US2170141A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1931-03-31 | 1939-08-22 | 0 | Details |
| US2169479A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1937-05-28 | 1939-08-15 | 0 | Details |
| US2150857A | Continuous inductive cab signaling and train control system | Expired / Lapsed | 1937-02-18 | 1939-03-14 | 0 | Details |
| US2149226A | Control switch | Expired / Lapsed | 1937-07-29 | 1939-02-28 | 0 | Details |
| US2141551A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1936-08-01 | 1938-12-27 | 0 | Details |
| US2138878A | Railway traffic controlling system | Expired / Lapsed | 1936-08-29 | 1938-12-06 | 0 | Details |
| US2132126A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1937-03-30 | 1938-10-04 | 0 | Details |
| US2126210A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1933-05-24 | 1938-08-09 | 0 | Details |
| US2126209A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1932-11-26 | 1938-08-09 | 0 | Details |
| US2124848A | Polar impulse repeater system | Expired / Lapsed | 1935-09-11 | 1938-07-26 | 0 | Details |
| US2122229A | Train describer system | Expired / Lapsed | 1935-11-21 | 1938-06-28 | 0 | Details |
| US2122112A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1934-05-23 | 1938-06-28 | 0 | Details |
| US2116173A | Relay stepping bank | Expired / Lapsed | 1933-12-05 | 1938-05-03 | 0 | Details |
| US2114255A | Centralizing traffic controlling system for railroads | Expired / Lapsed | 1934-04-28 | 1938-04-12 | 0 | Details |
| US2109153A | Traffic direction controlling system for railroads | Expired / Lapsed | 1933-12-28 | 1938-02-22 | 0 | Details |
| US2098041A | Continuous inductive coded cab signaling system | Expired / Lapsed | 1936-03-19 | 1937-11-02 | 0 | Details |
| US2097798A | Light signal unit | Expired / Lapsed | 1936-01-30 | 1937-11-02 | 0 | Details |
| US2096832A | Centralized traffic controlling system | Expired / Lapsed | 1930-12-08 | 1937-10-26 | 0 | Details |
| US2088699A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1933-01-17 | 1937-08-03 | 0 | Details |
| US2083920A | Railway track circuit | Expired / Lapsed | 1934-07-28 | 1937-06-15 | 0 | Details |
| US2082550A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1933-07-29 | 1937-06-01 | 0 | Details |
| US2081900A | Automatic switching system for railroads | Expired / Lapsed | 1931-05-29 | 1937-06-01 | 0 | Details |
| US2082464A | Train dispatching system for railroads | Expired / Lapsed | 1929-03-19 | 1937-06-01 | 0 | Details |
| US2073050A | Train dispatching system for railroads | Expired / Lapsed | 1927-04-02 | 1937-03-09 | 0 | Details |
| US2072079A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1933-10-13 | 1937-03-02 | 0 | Details |
| US2068906A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1932-11-03 | 1937-01-26 | 0 | Details |
| US2069169A | Relay | Expired / Lapsed | 1932-04-28 | 1937-01-26 | 0 | Details |
| US2068731A | Car retarder for railroads | Expired / Lapsed | 1930-12-26 | 1937-01-26 | 0 | Details |
| US2067151A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1932-12-30 | 1937-01-05 | 0 | Details |
| US2067145A | Centralized traffic controlling system for railroads | Expired / Lapsed | 1932-12-20 | 1937-01-05 | 0 | Details |
| US2065663A | Light signal system for railroads | Expired / Lapsed | 1929-08-16 | 1936-12-29 | 0 | Details |
| US2062822A | Selective signaling system | Expired / Lapsed | 1933-02-04 | 1936-12-01 | 0 | Details |
| US2062274A | Power supply system | Expired / Lapsed | 1935-07-22 | 1936-11-24 | 0 | Details |
| US2051400A | Mechanical brake for railway switch machines | Expired / Lapsed | 1931-12-23 | 1936-08-18 | 0 | Details |
| US2045923A | Inductive device for detecting the passage of railway vehic… | Expired / Lapsed | 1935-01-15 | 1936-06-30 | 0 | Details |
| US2038094A | Railway signaling system | Expired / Lapsed | 1932-09-20 | 1936-04-21 | 0 | Details |
| US1995652A | Power supply system | Expired / Lapsed | 1933-08-17 | 1935-03-26 | 0 | Details |
| US1995272A | Centralized traffic controlling system | Expired / Lapsed | 1932-05-25 | 1935-03-19 | 0 | Details |
| US1983510A | Traffic controlling system for railroads | Expired / Lapsed | 1932-06-15 | 1934-12-04 | 0 | Details |
| US1969064A | Relay | Expired / Lapsed | 1930-04-05 | 1934-08-07 | 0 | Details |
| US1932970A | Brake | Expired / Lapsed | 1929-10-14 | 1933-10-31 | 0 | Details |
| US1928802A | Time element device | Expired / Lapsed | 1932-03-25 | 1933-10-03 | 0 | Details |
| US1852395A | Signaling system for railroads | Expired / Lapsed | 1930-08-23 | 1932-04-05 | 0 | Details |
| US1824150A | Brake for railroad switch machines | Expired / Lapsed | 1929-10-14 | 1931-09-22 | 0 | Details |
| US1794626A | Train-describing system | Expired / Lapsed | 1929-01-19 | 1931-03-03 | 0 | Details |
| US1794618A | Alternating-current-relay motor | Expired / Lapsed | 1926-11-17 | 1931-03-03 | 0 | Details |
| US1794593A | Automatic train-control system | Expired / Lapsed | 1916-07-27 | 1931-03-03 | 0 | Details |
| US1785618A | Copper-carbon contact | Expired / Lapsed | 1926-09-22 | 1930-12-16 | 0 | Details |
| US1737128A | Alternating-current induction motor or the like | Expired / Lapsed | 1925-10-28 | 1929-11-26 | 0 | Details |
| US1682693A | Support for light signals | Expired / Lapsed | 1924-12-29 | 1928-08-28 | 0 | Details |
| US1681131A | Railway-car-classification system | Expired / Lapsed | 1926-01-14 | 1928-08-14 | 0 | Details |
| US1575579A | Train control | Expired / Lapsed | 1924-01-04 | 1926-03-02 | 0 | Details |
| US1512288A | Automatic train-control system | Expired / Lapsed | 1919-04-11 | 1924-10-21 | 0 | Details |
| US1224542A | Circuit-controller. | Expired / Lapsed | 1913-01-18 | 1917-05-01 | 0 | Details |
| US1216420A | Relay. | Expired / Lapsed | 1914-12-01 | 1917-02-20 | 0 | Details |
| US804176A | System of automatic signaling for electric railways. | Expired / Lapsed | 1905-08-01 | 1905-11-07 | 0 | Details |