Hitachi Rail STS USA Inc
Hitachi RaActive Patents
0
Total Holdings
225
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2558445A | Traffic controlling apparatus | Expired / Lapsed | 1947-09-06 | 1951-06-26 | 0 | Details |
| US2555013A | Approach control apparatus for railroad block signaling sys… | Expired / Lapsed | 1946-07-02 | 1951-05-29 | 0 | Details |
| US2554000A | Manual block signaling system for railways not having conti… | Expired / Lapsed | 1944-11-28 | 1951-05-22 | 0 | Details |
| US2545863A | Alternating current rectifier | Expired / Lapsed | 1947-12-31 | 1951-03-20 | 0 | Details |
| US2541879A | Vacuum tube circuits | Expired / Lapsed | 1944-07-18 | 1951-02-13 | 0 | Details |
| US2537298A | Traffic controlling apparatus | Expired / Lapsed | 1945-10-30 | 1951-01-09 | 0 | Details |
| US2531505A | Noise suppression means for communication receiving apparat… | Expired / Lapsed | 1947-10-08 | 1950-11-28 | 0 | Details |
| US2515638A | Assembly for communication apparatus | Expired / Lapsed | 1947-06-23 | 1950-07-18 | 0 | Details |
| US2510316A | Emergency break-in system for channel communication systems | Expired / Lapsed | 1948-05-18 | 1950-06-06 | 0 | Details |
| US2510322A | Selenium rectifier | Expired / Lapsed | 1945-09-22 | 1950-06-06 | 0 | Details |
| US2509331A | Railway train interval detection system | Expired / Lapsed | 1947-09-23 | 1950-05-30 | 0 | Details |
| US2505979A | Contact assembly for plug-in devices | Expired / Lapsed | 1947-04-24 | 1950-05-02 | 0 | Details |
| US2498357A | Process of making insulated electrical conductors | Expired / Lapsed | 1946-01-24 | 1950-02-21 | 0 | Details |
| US2496591A | Socket assembly tool | Expired / Lapsed | 1948-09-18 | 1950-02-07 | 0 | Details |
| US2488372A | Cabinet for office communication apparatus | Expired / Lapsed | 1946-02-11 | 1949-11-15 | 0 | Details |
| US2484700A | Transmitter for code communication systems | Expired / Lapsed | 1948-04-08 | 1949-10-11 | 0 | Details |
| US2477993A | Pulse counting time-measuring system and apparatus | Expired / Lapsed | 1948-05-12 | 1949-08-02 | 0 | Details |
| US2478000A | Hot bearing detector and selfchecking electrical apparatus … | Expired / Lapsed | 1946-03-27 | 1949-08-02 | 0 | Details |
| US2468845A | Alternating electric current rectifier | Expired / Lapsed | 1945-07-28 | 1949-05-03 | 0 | Details |
| US2460337A | Remote-control system | Expired / Lapsed | 1946-06-20 | 1949-02-01 | 0 | Details |
| US2444715A | Voltage regulating transformer | Expired / Lapsed | 1946-09-05 | 1948-07-06 | 0 | Details |
| US2444385A | Alternating electric current rectifier | Expired / Lapsed | 1946-01-24 | 1948-06-29 | 0 | Details |
| US2437326A | Remote control system | Expired / Lapsed | 1944-11-10 | 1948-03-09 | 0 | Details |
| US2431631A | Remote control system | Expired / Lapsed | 1945-09-04 | 1947-11-25 | 0 | Details |
| US2429056A | Slide fence protection system for railroads | Expired / Lapsed | 1945-09-22 | 1947-10-14 | 0 | Details |
| US2425109A | Railway switch and signal control and interlocking apparatus | Expired / Lapsed | 1944-10-07 | 1947-08-05 | 0 | Details |
| US2422231A | Pulse generating receiver for coded carrier signals | Expired / Lapsed | 1944-12-06 | 1947-06-17 | 0 | Details |
| US2420546A | Remote control system | Expired / Lapsed | 1945-02-20 | 1947-05-13 | 0 | Details |
| US2420579A | Railway traffic controlling apparatus | Expired / Lapsed | 1943-09-04 | 1947-05-13 | 0 | Details |
| US2415945A | Housing for lighting arresters | Expired / Lapsed | 1943-07-10 | 1947-02-18 | 0 | Details |
| US2409698A | Selecting apparatus for remotecontrol systems | Expired / Lapsed | 1944-08-12 | 1946-10-22 | 0 | Details |
| US2409697A | Transmitting apparatus for remote control systems | Expired / Lapsed | 1944-08-12 | 1946-10-22 | 0 | Details |
| US2409720A | Selective control and indication system | Expired / Lapsed | 1943-11-04 | 1946-10-22 | 0 | Details |
| US2409696A | Remote control system | Expired / Lapsed | 1943-03-06 | 1946-10-22 | 0 | Details |
| US2408711A | Apparatus to detect change of voltage | Expired / Lapsed | 1945-06-15 | 1946-10-01 | 0 | Details |
| US2404303A | Railway traffic controlling apparatus | Expired / Lapsed | 1944-06-10 | 1946-07-16 | 0 | Details |
| US2403744A | Code detecting means | Expired / Lapsed | 1945-03-16 | 1946-07-09 | 0 | Details |
| US2400260A | Selective control and indication system | Expired / Lapsed | 1943-07-17 | 1946-05-14 | 0 | Details |
| US2400258A | Apparatus for selective control and indication systems | Expired / Lapsed | 1942-09-30 | 1946-05-14 | 0 | Details |
| US2398572A | Remote-control system | Expired / Lapsed | 1943-12-18 | 1946-04-16 | 0 | Details |
| US2397401A | Remote-control system | Expired / Lapsed | 1944-11-15 | 1946-03-26 | 0 | Details |
| US2396812A | Remote-control system | Expired / Lapsed | 1943-08-27 | 1946-03-19 | 0 | Details |
| US2395693A | Transmitting apparatus for remote control systems | Expired / Lapsed | 1944-11-02 | 1946-02-26 | 0 | Details |
| US2394971A | Remote control system | Expired / Lapsed | 1944-09-09 | 1946-02-19 | 0 | Details |
| US2394080A | Remote control system | Expired / Lapsed | 1944-06-10 | 1946-02-05 | 0 | Details |
| US2393377A | Transmitting apparatus for remote control systems | Expired / Lapsed | 1944-09-15 | 1946-01-22 | 0 | Details |
| US2390010A | Railway signaling apparatus | Expired / Lapsed | 1944-06-30 | 1945-11-27 | 0 | Details |
| US2385179A | Railway traffic controlling apparatus | Expired / Lapsed | 1942-11-11 | 1945-09-18 | 0 | Details |
| US2382140A | Vehicle counting apparatus | Expired / Lapsed | 1943-04-03 | 1945-08-14 | 0 | Details |
| US2381499A | Selective receiver for remote control systems | Expired / Lapsed | 1944-09-15 | 1945-08-07 | 0 | Details |
| US2380880A | Alternating electric current rectifier of the selenium type | Expired / Lapsed | 1944-01-19 | 1945-07-31 | 0 | Details |
| US2360288A | Leakage indicator for alternating electric current circuits | Expired / Lapsed | 1941-12-18 | 1944-10-10 | 0 | Details |
| US2354602A | Railway traffic controlling apparatus | Expired / Lapsed | 1943-09-09 | 1944-07-25 | 0 | Details |
| US2352283A | Electrical rectifier | Expired / Lapsed | 1942-05-28 | 1944-06-27 | 0 | Details |
| US2352299A | Apparatus for the conversion or inversion of direct electri… | Expired / Lapsed | 1942-03-17 | 1944-06-27 | 0 | Details |
| US2351540A | Railway traffic controlling apparatus | Expired / Lapsed | 1942-08-05 | 1944-06-13 | 0 | Details |
| US2350663A | Electrical relay | Expired / Lapsed | 1942-08-21 | 1944-06-06 | 0 | Details |
| US2349987A | Signal system using phase modulation | Expired / Lapsed | 1942-01-12 | 1944-05-30 | 0 | Details |
| US2349629A | Asymmetric device and mounting means therefor | Expired / Lapsed | 1942-02-12 | 1944-05-23 | 0 | Details |
| US2348666A | Apparatus for transmitting electrical signals | Expired / Lapsed | 1942-02-26 | 1944-05-09 | 0 | Details |
| US2344333A | Railway traffic controlling apparatus | Expired / Lapsed | 1941-09-25 | 1944-03-14 | 0 | Details |
| US2343784A | Centralized traffic controlling system | Expired / Lapsed | 1942-07-08 | 1944-03-07 | 0 | Details |
| US2342315A | Train detecting and reporting apparatus | Expired / Lapsed | 1941-06-05 | 1944-02-22 | 0 | Details |
| US2339872A | Remote control system | Expired / Lapsed | 1941-07-22 | 1944-01-25 | 0 | Details |
| US2334468A | Receiving apparatus for communication systems | Expired / Lapsed | 1942-03-04 | 1943-11-16 | 0 | Details |
| US2332279A | Railway signaling system | Expired / Lapsed | 1943-01-08 | 1943-10-19 | 0 | Details |
| US2331815A | Coded track circuit for railway cab signal control | Expired / Lapsed | 1942-12-22 | 1943-10-12 | 0 | Details |
| US2331262A | Railway traffic controlling apparatus | Expired / Lapsed | 1942-08-19 | 1943-10-05 | 0 | Details |
| US2324912A | Railway signaling apparatus | Expired / Lapsed | 1942-07-24 | 1943-07-20 | 0 | Details |
| US2321662A | Electrical apparatus | Expired / Lapsed | 1941-08-07 | 1943-06-15 | 0 | Details |
| US2320792A | Railway traffic controlling apparatus | Expired / Lapsed | 1941-12-30 | 1943-06-01 | 0 | Details |
| US2316331A | Voltage regulating apparatus | Expired / Lapsed | 1941-06-07 | 1943-04-13 | 0 | Details |
| US2315887A | Railway traffic controlling apparatus | Expired / Lapsed | 1941-09-17 | 1943-04-06 | 0 | Details |
| US2313903A | Remote control system | Expired / Lapsed | 1941-08-16 | 1943-03-16 | 0 | Details |
| US2309743A | Decoding apparatus and method | Expired / Lapsed | 1940-09-05 | 1943-02-02 | 0 | Details |
| US2305952A | Wattmeter | Expired / Lapsed | 1942-02-17 | 1942-12-22 | 0 | Details |
| US2305971A | Speed responsive apparatus | Expired / Lapsed | 1941-10-15 | 1942-12-22 | 0 | Details |
| US2303875A | Remote control system | Expired / Lapsed | 1940-03-28 | 1942-12-01 | 0 | Details |
| US2300272A | Railway traffic controlling apparatus | Expired / Lapsed | 1939-12-23 | 1942-10-27 | 0 | Details |
| US2297119A | Railway traffic controlling apparatus | Expired / Lapsed | 1941-12-05 | 1942-09-29 | 0 | Details |
| US2291592A | Electrical rectifier | Expired / Lapsed | 1940-08-10 | 1942-07-28 | 0 | Details |
| US2282396A | Wattmeter | Expired / Lapsed | 1940-12-26 | 1942-05-12 | 0 | Details |
| US2281958A | Mounting means for relays | Expired / Lapsed | 1939-08-24 | 1942-05-05 | 0 | Details |
| US2280456A | Conversion of single-phase alternating electric currents to… | Expired / Lapsed | 1940-10-09 | 1942-04-21 | 0 | Details |
| US2280009A | Railway traffic controlling apparatus | Expired / Lapsed | 1941-03-27 | 1942-04-14 | 0 | Details |
| US2280018A | Signaling apparatus | Expired / Lapsed | 1939-05-18 | 1942-04-14 | 0 | Details |
| US2277469A | Receiving apparatus for train communication systems | Expired / Lapsed | 1940-12-31 | 1942-03-24 | 0 | Details |
| US2277459A | Railway signaling system | Expired / Lapsed | 1940-08-20 | 1942-03-24 | 0 | Details |
| US2276706A | Electric signaling system | Expired / Lapsed | 1941-06-25 | 1942-03-17 | 0 | Details |
| US2276634A | Railway traffic controlling apparatus | Expired / Lapsed | 1941-02-07 | 1942-03-17 | 0 | Details |
| US2273477A | Railway traffic controlling apparatus | Expired / Lapsed | 1940-03-02 | 1942-02-17 | 0 | Details |
| US2273383A | Remote control system | Expired / Lapsed | 1938-08-05 | 1942-02-17 | 0 | Details |
| US2273231A | Remote control system | Expired / Lapsed | 1938-08-03 | 1942-02-17 | 0 | Details |
| US2266922A | Manufacture of alternating current rectifiers | Expired / Lapsed | 1939-09-06 | 1941-12-23 | 0 | Details |
| US2265363A | Detachable electrical connectors | Expired / Lapsed | 1940-07-26 | 1941-12-09 | 0 | Details |
| US2264500A | Railway signaling apparatus | Expired / Lapsed | 1939-08-11 | 1941-12-02 | 0 | Details |
| US2259573A | Remote control system | Expired / Lapsed | 1939-03-11 | 1941-10-21 | 0 | Details |
| US2249722A | Approach control apparatus for railway signaling systems | Expired / Lapsed | 1940-02-09 | 1941-07-15 | 0 | Details |
| US2241614A | Railway traffic controlling apparatus | Expired / Lapsed | 1940-08-27 | 1941-05-13 | 0 | Details |
| US2235051A | Manufacture of selenium and like rectifiers | Expired / Lapsed | 1940-01-31 | 1941-03-18 | 0 | Details |
| US2235540A | Control system for alternative sources of supply of electri… | Expired / Lapsed | 1938-01-18 | 1941-03-18 | 0 | Details |
| US2230859A | Train dispatching system | Expired / Lapsed | 1938-03-15 | 1941-02-04 | 0 | Details |
| US2229249A | Remote control system | Expired / Lapsed | 1932-03-23 | 1941-01-21 | 0 | Details |
| US2224374A | Remote control system | Expired / Lapsed | 1940-03-16 | 1940-12-10 | 0 | Details |
| US2222801A | Speed responsive apparatus | Expired / Lapsed | 1939-07-07 | 1940-11-26 | 0 | Details |
| US2222048A | Apparatus for the production of electric oscillations | Expired / Lapsed | 1940-02-21 | 1940-11-19 | 0 | Details |
| US2222049A | Apparatus for amplifying alternating or pulsating electric … | Expired / Lapsed | 1940-02-09 | 1940-11-19 | 0 | Details |
| US2217526A | Indicating circuit controller | Expired / Lapsed | 1939-04-13 | 1940-10-08 | 0 | Details |
| US2216820A | Remote control system | Expired / Lapsed | 1937-04-17 | 1940-10-08 | 0 | Details |
| US2216631A | Railway traffic controlling apparatus | Expired / Lapsed | 1939-07-12 | 1940-10-01 | 0 | Details |
| US2216610A | Signaling system | Expired / Lapsed | 1937-08-31 | 1940-10-01 | 0 | Details |
| US2215892A | Annunciating apparatus | Expired / Lapsed | 1939-06-28 | 1940-09-24 | 0 | Details |
| US2215822A | Railway signaling apparatus | Expired / Lapsed | 1939-06-27 | 1940-09-24 | 0 | Details |
| US2215909A | Braking mechanism | Expired / Lapsed | 1938-11-19 | 1940-09-24 | 0 | Details |
| US2208446A | Remote control apparatus | Expired / Lapsed | 1939-02-17 | 1940-07-16 | 0 | Details |
| US2207097A | Light sensitive device | Expired / Lapsed | 1938-07-20 | 1940-07-09 | 0 | Details |
| US2206550A | Remote control apparatus | Expired / Lapsed | 1936-06-16 | 1940-07-02 | 0 | Details |
| US2198704A | Electrical relay | Expired / Lapsed | 1937-06-08 | 1940-04-30 | 0 | Details |
| US2197417A | Signaling system | Expired / Lapsed | 1939-03-14 | 1940-04-16 | 0 | Details |
| US2197416A | Signal system | Expired / Lapsed | 1939-02-17 | 1940-04-16 | 0 | Details |
| US2197130A | Remote controlling apparatus | Expired / Lapsed | 1928-07-09 | 1940-04-16 | 0 | Details |
| US2190526A | Light signal | Expired / Lapsed | 1938-08-06 | 1940-02-13 | 0 | Details |
| US2184877A | Approach control apparatus for railway signaling systems | Expired / Lapsed | 1938-07-13 | 1939-12-26 | 0 | Details |
| US2183155A | Remote control system | Expired / Lapsed | 1935-07-16 | 1939-12-12 | 0 | Details |
| US2179137A | Alternating current rectifier of the dry surface contact ty… | Expired / Lapsed | 1937-06-09 | 1939-11-07 | 0 | Details |
| US2178290A | Speed responsive apparatus | Expired / Lapsed | 1937-09-29 | 1939-10-31 | 0 | Details |
| US2178289A | Electrical relay | Expired / Lapsed | 1937-05-07 | 1939-10-31 | 0 | Details |
| US2176866A | Apparatus for the control of highway crossing signals | Expired / Lapsed | 1938-07-08 | 1939-10-24 | 0 | Details |
| US2176600A | Remote control system | Expired / Lapsed | 1932-10-08 | 1939-10-17 | 0 | Details |
| US2172887A | Electrical rectifier | Expired / Lapsed | 1937-10-21 | 1939-09-12 | 0 | Details |
| US2171771A | Railway traffic controlling apparatus | Expired / Lapsed | 1938-06-23 | 1939-09-05 | 0 | Details |
| US2168462A | Manufacture of alternating current rectifiers of the dry-co… | Expired / Lapsed | 1938-07-23 | 1939-08-08 | 0 | Details |
| US2168786A | Remote control system | Expired / Lapsed | 1934-01-19 | 1939-08-08 | 0 | Details |
| US2166316A | Railway traffic controlling apparatus | Expired / Lapsed | 1937-12-16 | 1939-07-18 | 0 | Details |
| US2164668A | Railway traffic controlling apparatus | Expired / Lapsed | 1938-07-07 | 1939-07-04 | 0 | Details |
| US2154539A | Traffic controlling apparatus | Expired / Lapsed | 1935-05-02 | 1939-04-18 | 0 | Details |
| US2152384A | Railway traffic controlling apparatus | Expired / Lapsed | 1928-02-16 | 1939-03-28 | 0 | Details |
| US2143501A | Apparatus for causing delayed operation of electroresponsiv… | Expired / Lapsed | 1936-10-21 | 1939-01-10 | 0 | Details |
| US2140601A | Successive electrical control of a series of devices | Expired / Lapsed | 1935-02-18 | 1938-12-20 | 0 | Details |
| US2139157A | Device for the repetition of signals on a vehicle | Expired / Lapsed | 1936-06-04 | 1938-12-06 | 0 | Details |
| US2131386A | Ground detecting apparatus | Expired / Lapsed | 1935-09-28 | 1938-09-27 | 0 | Details |
| US2130453A | Speed responsive apparatus | Expired / Lapsed | 1937-04-02 | 1938-09-20 | 0 | Details |
| US2126674A | Electrical relay | Expired / Lapsed | 1935-10-18 | 1938-08-09 | 0 | Details |
| US2122819A | Electrical connecter | Expired / Lapsed | 1936-06-19 | 1938-07-05 | 0 | Details |
| US2117820A | Electrical relay | Expired / Lapsed | 1935-11-08 | 1938-05-17 | 0 | Details |
| US2112228A | Signaling apparatus | Expired / Lapsed | 1936-09-03 | 1938-03-29 | 0 | Details |
| US2104185A | Railway braking apparatus | Expired / Lapsed | 1936-06-16 | 1938-01-04 | 0 | Details |
| US2101207A | Battery charging apparatus | Expired / Lapsed | 1935-05-11 | 1937-12-07 | 0 | Details |
| US2089824A | Apparatus for railway train communication systems | Expired / Lapsed | 1936-04-07 | 1937-08-10 | 0 | Details |
| US2089835A | Apparatus for detecting the passage of railway cars | Expired / Lapsed | 1935-10-31 | 1937-08-10 | 0 | Details |
| US2089830A | Light sensitive apparatus | Expired / Lapsed | 1934-02-10 | 1937-08-10 | 0 | Details |
| US2082143A | Electric signaling system | Expired / Lapsed | 1936-08-14 | 1937-06-01 | 0 | Details |
| US2080504A | Electrical apparatus | Expired / Lapsed | 1936-07-21 | 1937-05-18 | 0 | Details |
| US2064639A | Communicating system | Expired / Lapsed | 1934-06-09 | 1936-12-15 | 0 | Details |
| US2061770A | Remote control apparatus | Expired / Lapsed | 1934-10-30 | 1936-11-24 | 0 | Details |
| US2054871A | Adjustable supporting structure for light signal units and … | Expired / Lapsed | 1935-06-12 | 1936-09-22 | 0 | Details |
| US2038082A | Apparatus for changing speed and direction of rotation by r… | Expired / Lapsed | 1935-02-15 | 1936-04-21 | 0 | Details |
| US2035998A | Illuminated panel | Expired / Lapsed | 1929-12-12 | 1936-03-31 | 0 | Details |
| US2022708A | Railway traffic controlling apparatus | Expired / Lapsed | 1933-06-08 | 1935-12-03 | 0 | Details |
| US2010840A | Ground detecting apparatus | Expired / Lapsed | 1931-10-15 | 1935-08-13 | 0 | Details |
| US2011237A | Remote control system | Expired / Lapsed | 1931-07-09 | 1935-08-13 | 0 | Details |
| US2004209A | Remote control system | Expired / Lapsed | 1932-09-15 | 1935-06-11 | 0 | Details |
| US1995200A | Manufacture of photo-electric cells | Expired / Lapsed | 1933-08-29 | 1935-03-19 | 0 | Details |
| US1994589A | Ground detecting apparatus | Expired / Lapsed | 1932-06-02 | 1935-03-19 | 0 | Details |
| US1986679A | Railway traffic controlling apparatus | Expired / Lapsed | 1927-08-02 | 1935-01-01 | 0 | Details |
| US1972941A | Railway signaling | Expired / Lapsed | 1931-02-19 | 1934-09-11 | 0 | Details |
| US1959062A | Radio receiving apparatus | Expired / Lapsed | 1931-11-24 | 1934-05-15 | 0 | Details |
| US1956675A | Rectifying apparatus | Expired / Lapsed | 1927-05-10 | 1934-05-01 | 0 | Details |
| US1940386A | Apparatus for the control of vibrating generators | Expired / Lapsed | 1930-11-01 | 1933-12-19 | 0 | Details |
| US1937783A | Wireless communication apparatus | Expired / Lapsed | 1931-05-27 | 1933-12-05 | 0 | Details |
| US1916307A | Battery charging regulation | Expired / Lapsed | 1930-10-30 | 1933-07-04 | 0 | Details |
| US1915137A | Thermostatic apparatus | Expired / Lapsed | 1932-08-23 | 1933-06-20 | 0 | Details |
| US1914220A | Electrical translating apparatus | Expired / Lapsed | 1930-06-23 | 1933-06-13 | 0 | Details |
| US1913699A | Electric annunciator | Expired / Lapsed | 1929-11-15 | 1933-06-13 | 0 | Details |
| US1908800A | Electrical rectifier | Expired / Lapsed | 1932-07-13 | 1933-05-16 | 0 | Details |
| US1908504A | Apparatus for controlling railway switches | Expired / Lapsed | 1932-04-23 | 1933-05-09 | 0 | Details |
| US1905724A | Electric current valve | Expired / Lapsed | 1927-08-08 | 1933-04-25 | 0 | Details |
| US1900732A | Electrical rectifier | Expired / Lapsed | 1931-09-25 | 1933-03-07 | 0 | Details |
| US1900404A | Apparatus for the control of vehicle brakes | Expired / Lapsed | 1931-03-21 | 1933-03-07 | 0 | Details |
| US1885908A | Apparatus for charging storage batteries | Expired / Lapsed | 1930-07-03 | 1932-11-01 | 0 | Details |
| US1883613A | Voltage regulating apparatus | Expired / Lapsed | 1931-09-05 | 1932-10-18 | 0 | Details |
| US1866147A | Transformer relay | Expired / Lapsed | 1931-12-26 | 1932-07-05 | 0 | Details |
| US1862211A | Electrical translating apparatus | Expired / Lapsed | 1928-06-20 | 1932-06-07 | 0 | Details |
| US1861083A | Electrical rectifier | Expired / Lapsed | 1929-01-29 | 1932-05-31 | 0 | Details |
| US1846708A | Electrical apparatus | Expired / Lapsed | 1929-07-27 | 1932-02-23 | 0 | Details |
| US1840114A | Electrical translating apparatus | Expired / Lapsed | 1929-03-21 | 1932-01-05 | 0 | Details |
| US1840098A | Lens for light signals | Expired / Lapsed | 1928-09-11 | 1932-01-05 | 0 | Details |
| US1833332A | Apparatus for rectifying alternating electric currents | Expired / Lapsed | 1928-11-15 | 1931-11-24 | 0 | Details |
| US1824577A | Electrical translating apparatus | Expired / Lapsed | 1930-02-07 | 1931-09-22 | 0 | Details |
| US1821002A | Railway traffic governing apparatus | Expired / Lapsed | 1930-08-21 | 1931-09-01 | 0 | Details |
| US1821029A | Railway signaling apparatus | Expired / Lapsed | 1929-10-19 | 1931-09-01 | 0 | Details |
| US1812202A | Electrical translating apparatus | Expired / Lapsed | 1929-07-09 | 1931-06-30 | 0 | Details |
| US1812187A | Railway traffic controlling apparatus | Expired / Lapsed | 1927-02-24 | 1931-06-30 | 0 | Details |
| US1806093A | Apparatus responsive to the passage of railway vehicles | Expired / Lapsed | 1930-06-07 | 1931-05-19 | 0 | Details |
| US1797587A | Current rectifying apparatus | Expired / Lapsed | 1927-03-29 | 1931-03-24 | 0 | Details |
| US1797268A | Electrical translating apparatus | Expired / Lapsed | 1926-10-30 | 1931-03-24 | 0 | Details |
| US1796372A | Asymmetric conductor of electricity | Expired / Lapsed | 1929-01-31 | 1931-03-17 | 0 | Details |
| US1795420A | Selective locking apparatus | Expired / Lapsed | 1928-04-24 | 1931-03-10 | 0 | Details |
| US1793213A | Electrical translating apparatus | Expired / Lapsed | 1929-11-20 | 1931-02-17 | 0 | Details |
| US1781827A | Railway-traffic-controlling apparatus | Expired / Lapsed | 1928-06-26 | 1930-11-18 | 0 | Details |
| US1781497A | Train-annunciating apparatus | Expired / Lapsed | 1929-09-20 | 1930-11-11 | 0 | Details |
| US1774754A | Apparatus for transmitting coded currents | Expired / Lapsed | 1929-03-26 | 1930-09-02 | 0 | Details |
| US1770705A | Railway-traffic controlling apparatus | Expired / Lapsed | 1928-09-12 | 1930-07-15 | 0 | Details |
| US1763097A | Power-supply means | Expired / Lapsed | 1923-07-19 | 1930-06-10 | 0 | Details |
| US1750123A | Apparatus for rectifying alternating electric currents | Expired / Lapsed | 1928-11-15 | 1930-03-11 | 0 | Details |
| US1741231A | Electrical translating apparatus | Expired / Lapsed | 1923-01-08 | 1929-12-31 | 0 | Details |
| US1739579A | Electrical translating apparatus | Expired / Lapsed | 1928-06-20 | 1929-12-17 | 0 | Details |
| US1728537A | Electrical rectifier | Expired / Lapsed | 1927-08-25 | 1929-09-17 | 0 | Details |
| US1725709A | Electrical apparatus | Expired / Lapsed | 1923-10-26 | 1929-08-20 | 0 | Details |
| US1715691A | Unidirectional current-carrying device | Expired / Lapsed | 1925-02-11 | 1929-06-04 | 0 | Details |
| US1712677A | Electric-current-rectifying apparatus | Expired / Lapsed | 1928-08-01 | 1929-05-14 | 0 | Details |
| US1710496A | Railway-traffic-controlling system | Expired / Lapsed | 1916-10-18 | 1929-04-23 | 0 | Details |
| US1704736A | Railway-traffic-controlling apparatus and electrical appara… | Expired / Lapsed | 1923-10-29 | 1929-03-12 | 0 | Details |
| US1672005A | Electrical apparatus | Expired / Lapsed | 1927-06-25 | 1928-06-05 | 0 | Details |
| US1661651A | Electromagnetic apparatus | Expired / Lapsed | 1927-09-10 | 1928-03-06 | 0 | Details |
| US1640335A | Unidirectional current-carrying device | Expired / Lapsed | 1925-01-07 | 1927-08-23 | 0 | Details |
| US1634420A | Electrical translating device | Expired / Lapsed | 1923-06-29 | 1927-07-05 | 0 | Details |
| US1633302A | Railway signaling | Expired / Lapsed | 1925-09-25 | 1927-06-21 | 0 | Details |
| US1626931A | Electrical relay | Expired / Lapsed | 1921-12-27 | 1927-05-03 | 0 | Details |
| US1620169A | Apparatus for transmitting coded currents | Expired / Lapsed | 1926-01-29 | 1927-03-08 | 0 | Details |
| US1566331A | Railway-traffic-controlling apparatus | Expired / Lapsed | 1925-04-11 | 1925-12-22 | 0 | Details |
| US1342635A | Railway-traffic-indicating apparatus | Expired / Lapsed | 1917-11-27 | 1920-06-08 | 0 | Details |
| US1302284A | Electromagnetic device. | Expired / Lapsed | 1916-02-02 | 1919-04-29 | 0 | Details |
| US1233764A | Manufacture of commutators. | Expired / Lapsed | 1917-03-16 | 1917-07-17 | 0 | Details |
| US1216446A | Electromagnetic apparatus. | Expired / Lapsed | 1915-03-09 | 1917-02-20 | 0 | Details |