Siemens and Halske AG
Siemens anActive Patents
1
Total Holdings
262
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| DE23176C | Hydraulic press for moving electrical cables with soft metal | Active / In Force | — | — | 0 | Details |
| GB1020404A | Improvements in or relating to telephone systems | Expired / Lapsed | 1964-06-03 | — | 0 | Details |
| GB912328A | Improvements in or relating to drive mechanisms | Expired / Lapsed | 1960-04-14 | — | 0 | Details |
| GB807738A | Improvements in or relating to radar systems | Expired / Lapsed | 1956-08-01 | — | 0 | Details |
| GB780455A | Improvements in or relating to semi-conductor junctions and… | Expired / Lapsed | 1955-06-28 | — | 0 | Details |
| GB719121A | Improvements in road traffic signalling installations | Expired / Lapsed | 1952-10-29 | — | 0 | Details |
| DE1006169B | Arrangement for converting mechanical into electrical vibra… | Expired / Lapsed | 1952-02-07 | — | 0 | Details |
| GB485948A | Improvements in and relating to cables for the transmission… | Expired / Lapsed | 1936-12-24 | — | 0 | Details |
| GB444673A | Improvements in and relating to regulating devices | Expired / Lapsed | 1935-03-14 | — | 0 | Details |
| GB441576A | Improvements in or relating to arrangements for indicating … | Expired / Lapsed | 1934-11-24 | — | 0 | Details |
| GB442555A | Improvements in or relating to traffic control systems | Expired / Lapsed | 1934-08-17 | — | 0 | Details |
| GB431946A | Improvements in or relating to telephone systems | Expired / Lapsed | 1934-01-18 | — | 0 | Details |
| GB387150A | Improvements in or relating to electric resistances | Expired / Lapsed | 1932-03-05 | — | 0 | Details |
| GB383286A | Improvements in or relating to electrical oscillation gener… | Expired / Lapsed | 1931-07-31 | — | 0 | Details |
| GB371421A | A system for supervising and controlling the parts of elect… | Expired / Lapsed | 1930-10-23 | — | 0 | Details |
| GB369546A | An improved light-electric arrangement with selenium cells | Expired / Lapsed | 1930-09-16 | — | 0 | Details |
| GB343893A | Improvements in or relating to sound reproducing apparatus | Expired / Lapsed | 1929-11-20 | — | 0 | Details |
| GB306902A | A process for the metallisation of thermally unstable subst… | Expired / Lapsed | 1929-02-20 | — | 0 | Details |
| GB300640A | Depolarising plate for galvanic cells | Expired / Lapsed | 1928-11-03 | — | 0 | Details |
| GB280214A | Method of and means for electrically controlling a sub-stat… | Expired / Lapsed | 1927-11-02 | — | 0 | Details |
| GB267556A | Improvements in or relating to electric signalling systems | Expired / Lapsed | 1927-03-12 | — | 0 | Details |
| GB103309A | Improvements in or relating to Apparatus for Printing Type … | Expired / Lapsed | 1917-01-12 | — | 0 | Details |
| US3347992A | Circuit arrangement controlling the release of lines in a c… | Expired / Lapsed | 1963-09-18 | 1967-10-17 | 2 | Details |
| US3342940A | Arrangement for registering call metering impulses in a com… | Expired / Lapsed | 1963-12-30 | 1967-09-19 | 2 | Details |
| US3335233A | Transducer for converting mechanical into electrical oscill… | Expired / Lapsed | 1963-11-13 | 1967-08-08 | 2 | Details |
| US3319140A | Pressure sensitive semiconductor device | Expired / Lapsed | 1964-12-09 | 1967-05-09 | 2 | Details |
| US3319082A | Pressure-sensitive semiconductor device of the transistor t… | Expired / Lapsed | 1964-07-20 | 1967-05-09 | 1 | Details |
| US3316461A | Installation stand for devices of highest frequency technol… | Expired / Lapsed | 1964-12-23 | 1967-04-25 | 2 | Details |
| US3293074A | Method and apparatus for growing monocrystalline layers on … | Expired / Lapsed | 1964-11-04 | 1966-12-20 | 2 | Details |
| US3290618A | Frequency modulated transistor oscillator | Expired / Lapsed | 1963-09-25 | 1966-12-06 | 2 | Details |
| US3287506A | Semiconductor-based electro-acoustic transducer | Expired / Lapsed | 1964-12-14 | 1966-11-22 | 2 | Details |
| US3284778A | Processor systems with index registers for address modifica… | Expired / Lapsed | 1963-02-28 | 1966-11-08 | 2 | Details |
| US3280267A | Cross-wire control circuit arrangement for communication sy… | Expired / Lapsed | 1963-03-08 | 1966-10-18 | 2 | Details |
| US3271521A | Circuit arrangement for ascertaining operating conditions o… | Expired / Lapsed | 1961-05-08 | 1966-09-06 | 2 | Details |
| US3267213A | Method of and circuit arrangement for securing teleprinter … | Expired / Lapsed | 1960-10-04 | 1966-08-16 | 2 | Details |
| US3236957A | Device for converting mechanical into electrical oscillatio… | Expired / Lapsed | 1962-02-27 | 1966-02-22 | 2 | Details |
| US3227806A | Communication system for telephone and teleprinter service | Expired / Lapsed | 1962-07-30 | 1966-01-04 | 2 | Details |
| US3226203A | Apparatus for preparing semiconductor rods | Expired / Lapsed | 1963-12-06 | 1965-12-28 | 2 | Details |
| US3213400A | Membrane-type strain gauge | Expired / Lapsed | 1961-11-24 | 1965-10-19 | 2 | Details |
| US3206728A | Identification signalling system utilizing a transponder | Expired / Lapsed | 1961-04-24 | 1965-09-14 | 2 | Details |
| US3205310A | Low loss arrangement for conversion of frequency bands, uti… | Expired / Lapsed | 1961-02-23 | 1965-09-07 | 2 | Details |
| US3195124A | Converting plural-element information | Expired / Lapsed | 1962-02-12 | 1965-07-13 | 2 | Details |
| US3193739A | Semiconductor device having four-layer components for obtai… | Expired / Lapsed | 1962-05-15 | 1965-07-06 | 2 | Details |
| US3184831A | Method of producing an electric contact with a semiconducto… | Expired / Lapsed | 1961-11-07 | 1965-05-25 | 2 | Details |
| US3157472A | Drawing semiconductor crystals | Expired / Lapsed | 1960-09-02 | 1964-11-17 | 2 | Details |
| US3150244A | Electromagnetic relay | Expired / Lapsed | 1962-03-26 | 1964-09-22 | 2 | Details |
| US3145447A | Method of producing a semiconductor device | Expired / Lapsed | 1961-02-01 | 1964-08-25 | 2 | Details |
| US3134695A | Apparatus for producing rod-shaped semiconductor bodies | Expired / Lapsed | 1959-12-08 | 1964-05-26 | 2 | Details |
| US3121203A | Semiconductor maser with modulating means | Expired / Lapsed | 1959-04-22 | 1964-02-11 | 2 | Details |
| US3086125A | Gated amplifier including timing pulses and saturation effe… | Expired / Lapsed | 1956-10-30 | 1963-04-16 | 2 | Details |
| US3078151A | Apparatus for drawing semiconductor bodies from a melt | Expired / Lapsed | 1959-09-25 | 1963-02-19 | 2 | Details |
| US3053638A | Method and apparatus for producing hyperpure silicon rods | Expired / Lapsed | 1960-10-31 | 1962-09-11 | 2 | Details |
| US3053953A | Electromagnetic relay | Expired / Lapsed | 1960-07-29 | 1962-09-11 | 0 | Details |
| US3051793A | Electronic selection circuits | Expired / Lapsed | 1958-03-18 | 1962-08-28 | 0 | Details |
| US3035183A | Monostable, bistable double base diode circuit utilizing ha… | Expired / Lapsed | 1957-05-22 | 1962-05-15 | 0 | Details |
| US3026509A | Conversion of decimal-coded binary numbers into decimal num… | Expired / Lapsed | 1957-04-01 | 1962-03-20 | 0 | Details |
| FR1284551A | Miniature construction groups with particularly small dimen… | Expired / Lapsed | 1960-11-21 | 1962-02-16 | 0 | Details |
| US2999737A | Production of highly pure single crystal semiconductor rods | Expired / Lapsed | 1959-04-16 | 1961-09-12 | 2 | Details |
| US2993155A | Semiconductor device having a voltage dependent capacitance | Expired / Lapsed | 1959-06-29 | 1961-07-18 | 0 | Details |
| US2983789A | Arrangement for suppressing disturbance in telegraphic comm… | Expired / Lapsed | 1957-04-15 | 1961-05-09 | 0 | Details |
| US2983792A | Coordinate switching devices | Expired / Lapsed | 1956-05-17 | 1961-05-09 | 0 | Details |
| US2983905A | Apparatus for signaling individual impulses of short durati… | Expired / Lapsed | 1956-01-25 | 1961-05-09 | 0 | Details |
| US2981810A | Sealed-in contact device | Expired / Lapsed | 1958-12-29 | 1961-04-25 | 0 | Details |
| US2978641A | Circuit ambiguity testing apparatus | Expired / Lapsed | 1957-10-15 | 1961-04-04 | 0 | Details |
| US2962704A | Measuring electric currents in terms of units | Expired / Lapsed | 1956-09-25 | 1960-11-29 | 0 | Details |
| US2956126A | Start-stop teleprinter system | Expired / Lapsed | 1957-05-22 | 1960-10-11 | 0 | Details |
| FR1235341A | Method and apparatus for continuously manufacturing thin mo… | Expired / Lapsed | 1959-03-05 | 1960-07-08 | 0 | Details |
| FR1235002A | Process for the manufacture of stranded cables and cables c… | Expired / Lapsed | 1959-09-05 | 1960-07-01 | 0 | Details |
| US2941152A | Impulse timing system and device | Expired / Lapsed | 1954-09-22 | 1960-06-14 | 0 | Details |
| US2933619A | Semi-conductor device comprising an anode, a cathode and a … | Expired / Lapsed | 1954-03-23 | 1960-04-19 | 0 | Details |
| US2925471A | Line coupling arrangement for signaling system | Expired / Lapsed | 1956-10-30 | 1960-02-16 | 0 | Details |
| US2919389A | Semiconductor arrangement for voltage-dependent capacitances | Expired / Lapsed | 1956-04-26 | 1959-12-29 | 0 | Details |
| US2913561A | Processing semiconductor rods | Expired / Lapsed | 1959-04-13 | 1959-11-17 | 0 | Details |
| FR1190542A | Method and device for producing plasma oscillations in elec… | Expired / Lapsed | 1957-08-30 | 1959-10-13 | 0 | Details |
| US2902642A | Testing electrical circuits for ambiguity and completeness | Expired / Lapsed | 1958-03-11 | 1959-09-01 | 0 | Details |
| US2892042A | Amplification regulation in multistage amplifier apparatus | Expired / Lapsed | 1954-11-30 | 1959-06-23 | 0 | Details |
| US2877304A | Signalling system for simultaneously transmitting a plurali… | Expired / Lapsed | 1953-02-20 | 1959-03-10 | 0 | Details |
| US2876147A | Method of and apparatus for producing semiconductor material | Expired / Lapsed | 1956-05-21 | 1959-03-03 | 2 | Details |
| US2863947A | Telephone system with local and toll call switching over id… | Expired / Lapsed | 1956-06-21 | 1958-12-09 | 0 | Details |
| US2861131A | Automatic telephone system | Expired / Lapsed | 1954-05-11 | 1958-11-18 | 0 | Details |
| US2854318A | Method of and apparatus for producing semiconductor materia… | Expired / Lapsed | 1957-06-26 | 1958-09-30 | 2 | Details |
| US2849532A | Circuit arrangement for the transmission of telegraphic int… | Expired / Lapsed | 1953-10-22 | 1958-08-26 | 0 | Details |
| US2842725A | Directional conductor device and method of making it | Expired / Lapsed | 1955-05-20 | 1958-07-08 | 0 | Details |
| FR1158080A | Arrangement for measuring electric currents in whole units | Expired / Lapsed | 1956-09-29 | 1958-06-06 | 0 | Details |
| FR1155336A | Device to increase the relay sensitivity, as well as the el… | Expired / Lapsed | 1956-08-02 | 1958-04-25 | 0 | Details |
| US2817048A | Transistor arrangement | Expired / Lapsed | 1955-12-13 | 1957-12-17 | 0 | Details |
| FR1141972A | Attenuator for waveguides, in particular for wave propagati… | Expired / Lapsed | 1955-12-08 | 1957-09-12 | 0 | Details |
| US2802055A | Two-way loudspeaker intercommunication system | Expired / Lapsed | 1953-07-10 | 1957-08-06 | 0 | Details |
| FR1133343A | Process and installation for the agglomeration by fusion of… | Expired / Lapsed | 1955-02-24 | 1957-03-26 | 0 | Details |
| US2786897A | Magnetic recorder | Expired / Lapsed | 1952-03-28 | 1957-03-26 | 0 | Details |
| US2772878A | Device for advancing tape records in telegraph apparatus | Expired / Lapsed | 1952-10-09 | 1956-12-04 | 0 | Details |
| FR1125277A | Process for the preparation of very pure crystalline substa… | Expired / Lapsed | 1955-05-25 | 1956-10-29 | 0 | Details |
| US2702494A | Apparatus for determining the temperatures of light-radiati… | Expired / Lapsed | 1951-08-13 | 1955-02-22 | 0 | Details |
| US2700067A | Apparatus for magnetically storing teleprinter signals | Expired / Lapsed | 1953-03-03 | 1955-01-18 | 0 | Details |
| US2691726A | Circuit arrangement for adjusting the frequency during the … | Expired / Lapsed | 1950-10-03 | 1954-10-12 | 0 | Details |
| US2679619A | Controlled semiconductor rectifier | Expired / Lapsed | 1950-09-09 | 1954-05-25 | 0 | Details |
| US2669604A | Method of and means for determining deviations in the amoun… | Expired / Lapsed | 1950-11-29 | 1954-02-16 | 0 | Details |
| DE829805C | Measuring device for determining the weight of railway vehi… | Expired / Lapsed | 1950-02-14 | 1952-01-28 | 0 | Details |
| US2282916A | Impulse transmitter | Expired / Lapsed | 1937-12-06 | 1942-05-12 | 0 | Details |
| US2272836A | Hemadynamometer | Expired / Lapsed | 1938-02-24 | 1942-02-10 | 0 | Details |
| US2265235A | Telephone system | Expired / Lapsed | 1938-05-02 | 1941-12-09 | 0 | Details |
| US2264369A | Oscillation generator | Expired / Lapsed | 1938-06-18 | 1941-12-02 | 0 | Details |
| DE712434C | Process for the production of pure surface filters and ultr… | Expired / Lapsed | 1938-01-26 | 1941-10-18 | 0 | Details |
| US2245373A | Magnetizable core | Expired / Lapsed | 1938-01-04 | 1941-06-10 | 0 | Details |
| DE706438C | Process for the production of metallic coatings on bodies f… | Expired / Lapsed | 1938-08-30 | 1941-05-27 | 0 | Details |
| US2242366A | Apparatus for testing magnetizable workpieces for cracks | Expired / Lapsed | 1937-10-20 | 1941-05-20 | 0 | Details |
| US2238893A | Subdivided magnetic core with polystyrene binder | Expired / Lapsed | 1938-05-25 | 1941-04-22 | 0 | Details |
| US2231160A | Inductance core having low negative temperature coefficient… | Expired / Lapsed | 1938-04-18 | 1941-02-11 | 0 | Details |
| US2227902A | Carrier frequency signal system | Expired / Lapsed | 1938-05-28 | 1941-01-07 | 0 | Details |
| DE699682C | Switching device or vacuum switch, the contact closure of w… | Expired / Lapsed | 1937-03-18 | 1940-12-04 | 0 | Details |
| US2217448A | Cathode | Expired / Lapsed | 1938-03-19 | 1940-10-08 | 0 | Details |
| US2215587A | Rodlike heating element | Expired / Lapsed | 1936-10-14 | 1940-09-24 | 0 | Details |
| US2210936A | Apparatus for simultaneously measuring two magnitudes throu… | Expired / Lapsed | 1937-06-30 | 1940-08-13 | 0 | Details |
| US2210029A | Variable condenser | Expired / Lapsed | 1936-02-25 | 1940-08-06 | 0 | Details |
| US2207829A | Recording instrument for electrical measurements | Expired / Lapsed | 1937-10-20 | 1940-07-16 | 0 | Details |
| US2203756A | Telephone system | Expired / Lapsed | 1938-02-24 | 1940-06-11 | 0 | Details |
| US2201642A | Inductive regulator for coarse and fine regulation | Expired / Lapsed | 1937-11-11 | 1940-05-21 | 0 | Details |
| US2197616A | Air-space insulated conductor | Expired / Lapsed | 1938-03-18 | 1940-04-16 | 0 | Details |
| US2194165A | Mechanical filter | Expired / Lapsed | 1938-06-24 | 1940-03-19 | 0 | Details |
| US2183755A | Thermonegative resistor | Expired / Lapsed | 1935-04-25 | 1939-12-19 | 0 | Details |
| US2182482A | Automatic telephone system | Expired / Lapsed | 1937-07-22 | 1939-12-05 | 0 | Details |
| US2178252A | Apparatus for testing the mechanical oscillation properties… | Expired / Lapsed | 1937-05-20 | 1939-10-31 | 0 | Details |
| US2177847A | Circuit arrangement adapted to equalize working voltage flu… | Expired / Lapsed | 1935-12-16 | 1939-10-31 | 0 | Details |
| US2177266A | Electrical condenser with dielectric of polymeric material | Expired / Lapsed | 1937-02-20 | 1939-10-24 | 0 | Details |
| US2172207A | Glow cathode | Expired / Lapsed | 1937-07-31 | 1939-09-05 | 0 | Details |
| US2167725A | Telephone system | Expired / Lapsed | 1937-02-17 | 1939-08-01 | 0 | Details |
| US2166932A | Method and system for testing high voltage insulation | Expired / Lapsed | 1936-03-16 | 1939-07-25 | 0 | Details |
| US2164595A | Method of coating electrodes | Expired / Lapsed | 1937-11-13 | 1939-07-04 | 0 | Details |
| DE677613C | Write and take-off head for magnetograpmme | Expired / Lapsed | 1936-08-19 | 1939-06-29 | 0 | Details |
| US2159790A | Frequency analyzer | Expired / Lapsed | 1936-08-12 | 1939-05-23 | 0 | Details |
| US2154288A | Process for making electrical contacts | Expired / Lapsed | 1937-07-01 | 1939-04-11 | 0 | Details |
| US2152221A | Film feeding device | Expired / Lapsed | 1936-09-23 | 1939-03-28 | 0 | Details |
| US2152016A | Modulation | Expired / Lapsed | 1935-08-15 | 1939-03-28 | 0 | Details |
| FR839140A | Electric cable or conductor similar to a cable, provided wi… | Expired / Lapsed | 1938-06-10 | 1939-03-27 | 0 | Details |
| US2146818A | Circuit arrangement for the control of glow tubes | Expired / Lapsed | 1930-05-28 | 1939-02-14 | 0 | Details |
| US2145095A | Telephone system | Expired / Lapsed | 1936-01-22 | 1939-01-24 | 0 | Details |
| US2144353A | Variable inductance device | Expired / Lapsed | 1936-01-06 | 1939-01-17 | 0 | Details |
| US2141890A | Variable inductance device | Expired / Lapsed | 1936-06-06 | 1938-12-27 | 0 | Details |
| US2139469A | Piezoelectric crystal electrode and method of forming the s… | Expired / Lapsed | 1937-01-27 | 1938-12-06 | 0 | Details |
| US2139135A | Telephone system | Expired / Lapsed | 1936-07-27 | 1938-12-06 | 0 | Details |
| US2139431A | Method for applying metallic coatings to ceramic bodies | Expired / Lapsed | 1936-06-11 | 1938-12-06 | 0 | Details |
| US2138344A | System for measuring alternating current quantities | Expired / Lapsed | 1936-09-01 | 1938-11-29 | 0 | Details |
| US2137401A | Electrical control device | Expired / Lapsed | 1936-07-08 | 1938-11-22 | 0 | Details |
| US2134850A | Signal transmission | Expired / Lapsed | 1935-09-14 | 1938-11-01 | 0 | Details |
| US2134577A | Electrode system | Expired / Lapsed | 1937-07-22 | 1938-10-25 | 0 | Details |
| DE662033C | Arrangement for determining the electrical properties of hu… | Expired / Lapsed | 1935-12-11 | 1938-07-02 | 0 | Details |
| US2118248A | Hydraulic governor | Expired / Lapsed | 1936-09-15 | 1938-05-24 | 0 | Details |
| US2118103A | Cable connecter and support | Expired / Lapsed | 1935-06-08 | 1938-05-24 | 0 | Details |
| US2115498A | Direction maintaining device for dirigible craft | Expired / Lapsed | 1934-08-15 | 1938-04-26 | 0 | Details |
| DE658570C | Device for magnetoelastic measurement of mechanical forces … | Expired / Lapsed | 1934-10-13 | 1938-04-06 | 0 | Details |
| US2111386A | Electrical circuit control device | Expired / Lapsed | 1936-02-24 | 1938-03-15 | 0 | Details |
| US2110523A | Bridge and similar connection for measuring alternating cur… | Expired / Lapsed | 1936-09-01 | 1938-03-08 | 0 | Details |
| US2101699A | Alternating current signaling system | Expired / Lapsed | 1934-05-26 | 1937-12-07 | 0 | Details |
| US2091107A | Electric heating element and method of making the same | Expired / Lapsed | 1933-07-14 | 1937-08-24 | 0 | Details |
| DE647724C | Signaling device with on and reset from the transmitter | Expired / Lapsed | — | 1937-07-10 | 0 | Details |
| DE645890C | Electric capacitor | Expired / Lapsed | — | 1937-06-04 | 0 | Details |
| US2081748A | Method of measuring mechanical forces | Expired / Lapsed | 1935-11-21 | 1937-05-25 | 0 | Details |
| US2072234A | Telephone metering system | Expired / Lapsed | 1935-07-15 | 1937-03-02 | 0 | Details |
| US2065489A | Transmission level controlling arrangement | Expired / Lapsed | 1932-07-14 | 1936-12-22 | 0 | Details |
| US2056769A | Electrical system for controlling any industrial measuring … | Expired / Lapsed | 1934-06-18 | 1936-10-06 | 0 | Details |
| US2053560A | Device for measuring mechanical forces and momenta | Expired / Lapsed | 1933-06-26 | 1936-09-08 | 0 | Details |
| US2050866A | Apparatus for testing the running of timepieces | Expired / Lapsed | 1934-02-19 | 1936-08-11 | 0 | Details |
| US2041147A | Signaling system | Expired / Lapsed | 1932-09-13 | 1936-05-19 | 0 | Details |
| DE628791C | Device for modulating alternating currents (carrier current… | Expired / Lapsed | 1930-12-13 | 1936-04-17 | 0 | Details |
| US2023221A | Transmitting measurements to a remote point | Expired / Lapsed | 1929-07-24 | 1935-12-03 | 0 | Details |
| FR790265A | Sorting machine | Expired / Lapsed | 1935-05-20 | 1935-11-16 | 0 | Details |
| US2020067A | Device for determining the temperature of electrically cond… | Expired / Lapsed | 1933-08-16 | 1935-11-05 | 0 | Details |
| DE620845C | Measuring device with float | Expired / Lapsed | 1930-08-29 | 1935-10-30 | 0 | Details |
| US2011384A | Supervising a loaded alternating current conductor | Expired / Lapsed | 1932-12-10 | 1935-08-13 | 0 | Details |
| US1997683A | Antiparasitic system for telegraph signals with electrostat… | Expired / Lapsed | 1931-06-20 | 1935-04-16 | 0 | Details |
| US1997412A | Regulating the altitude of aircraft | Expired / Lapsed | 1933-11-23 | 1935-04-09 | 0 | Details |
| US1984471A | Lenticulated film | Expired / Lapsed | 1932-07-16 | 1934-12-18 | 0 | Details |
| US1981056A | Method of neutralizing disturbing electric waves | Expired / Lapsed | 1927-07-08 | 1934-11-20 | 0 | Details |
| US1952854A | Manufacture of thermionic cathodes | Expired / Lapsed | 1931-09-09 | 1934-03-27 | 0 | Details |
| DE594991C | Process for producing two recordings of acoustic processes … | Expired / Lapsed | 1931-01-10 | 1934-03-24 | 0 | Details |
| DE594675C | Device for recording signals, in particular in shaft signal… | Expired / Lapsed | 1930-02-02 | 1934-03-20 | 0 | Details |
| US1943521A | Lens for optical purposes | Expired / Lapsed | 1932-11-03 | 1934-01-16 | 0 | Details |
| US1936058A | Production of corrosion-resistant coatings on aluminum and … | Expired / Lapsed | 1932-12-13 | 1933-11-21 | 0 | Details |
| DE587083C | Device for fastening pipes, cables, wires and other objects | Expired / Lapsed | 1931-04-25 | 1933-10-30 | 0 | Details |
| US1929216A | Apparatus for controlling electrical circuits by means of e… | Expired / Lapsed | 1931-04-01 | 1933-10-03 | 0 | Details |
| DE583656C | Endless steel tape for magnetic recording of acoustic events | Expired / Lapsed | — | 1933-09-07 | 0 | Details |
| US1924469A | Push-pull amplifier | Expired / Lapsed | 1932-01-02 | 1933-08-29 | 0 | Details |
| US1919806A | Magnetic material | Expired / Lapsed | 1932-04-28 | 1933-07-25 | 0 | Details |
| FR748828A | Electrode arrangement for medical treatment in the capacito… | Expired / Lapsed | 1933-01-11 | 1933-07-10 | 0 | Details |
| US1916624A | Automatic control mechanism | Expired / Lapsed | 1929-03-21 | 1933-07-04 | 0 | Details |
| DE577352C | Arrangement for transmitting the movement of an encoder sha… | Expired / Lapsed | 1926-10-22 | 1933-05-30 | 0 | Details |
| US1908365A | Telephone system | Expired / Lapsed | 1932-06-22 | 1933-05-09 | 0 | Details |
| DE572018C | Device for remote transmission of several variables, in par… | Expired / Lapsed | 1929-02-27 | 1933-03-09 | 0 | Details |
| DE570781C | Measuring device for gas analysis based on the principle of… | Expired / Lapsed | 1931-01-21 | 1933-02-20 | 0 | Details |
| DE566232C | Power relays, in particular power direction relays | Expired / Lapsed | 1930-12-23 | 1932-12-13 | 0 | Details |
| DE564871C | Pressure and differential pressure meters | Expired / Lapsed | 1929-09-03 | 1932-11-24 | 0 | Details |
| US1888667A | Stabilizing device for ships | Expired / Lapsed | 1931-10-26 | 1932-11-22 | 0 | Details |
| DE562264C | Device for alternating connection of one of several measuri… | Expired / Lapsed | 1928-03-17 | 1932-10-24 | 0 | Details |
| DE558726C | Device for remote control of an extension from a main offic… | Expired / Lapsed | 1925-10-07 | 1932-09-10 | 0 | Details |
| FR730790A | Coupling arrangement supplied with at least two currents, i… | Expired / Lapsed | 1932-02-01 | 1932-08-24 | 0 | Details |
| US1872842A | Call recording and charging system | Expired / Lapsed | 1931-03-11 | 1932-08-23 | 0 | Details |
| US1870997A | Printing telegraph exchange system | Expired / Lapsed | 1930-01-04 | 1932-08-09 | 0 | Details |
| DE555939C | Electric regulator for steam boiler feed | Expired / Lapsed | 1929-04-24 | 1932-08-01 | 0 | Details |
| DE554340C | Pointer guide for measuring devices | Expired / Lapsed | 1926-12-01 | 1932-07-20 | 0 | Details |
| FR726484A | Smoke density indicator | Expired / Lapsed | 1931-11-17 | 1932-05-30 | 0 | Details |
| US1856969A | Apparatus for treating living cells by means of rays of lig… | Expired / Lapsed | 1928-09-26 | 1932-05-03 | 0 | Details |
| US1855562A | Method of insulating bodies | Expired / Lapsed | 1929-02-09 | 1932-04-26 | 0 | Details |
| US1854315A | Transmission of colored pictures | Expired / Lapsed | 1930-09-27 | 1932-04-19 | 0 | Details |
| US1847127A | Electrical testing system | Expired / Lapsed | 1928-11-08 | 1932-03-01 | 0 | Details |
| FR720957A | Current switch, especially for pulse transmitting instrumen… | Expired / Lapsed | 1931-08-01 | 1932-02-26 | 0 | Details |
| US1837031A | High frequency induction furnace or heating apparatus | Expired / Lapsed | 1927-07-20 | 1931-12-15 | 0 | Details |
| US1829756A | Homogeneous body consisting of rhenium | Expired / Lapsed | 1929-05-18 | 1931-11-03 | 0 | Details |
| DE537322C | Oscillograph with rotating polygon mirror and weak light so… | Expired / Lapsed | 1930-04-03 | 1931-11-02 | 0 | Details |
| DE516394C | Dry rectifier | Expired / Lapsed | — | 1931-01-22 | 0 | Details |
| US1787997A | Means for indicating frequency changes | Expired / Lapsed | 1927-10-20 | 1931-01-06 | 0 | Details |
| FR695826A | Chemographic receiver for telephotography | Expired / Lapsed | 1930-05-19 | 1930-12-22 | 0 | Details |
| DE499545C | Measuring and recording device, in particular for monitorin… | Expired / Lapsed | 1929-04-10 | 1930-06-10 | 0 | Details |
| US1758088A | Method of and means for determining alpha constituent in al… | Expired / Lapsed | 1927-08-29 | 1930-05-13 | 0 | Details |
| US1746327A | Telephone system | Expired / Lapsed | 1928-02-27 | 1930-02-11 | 0 | Details |
| DE490579C | Piezoelectric crystal arrangement | Expired / Lapsed | 1928-06-16 | 1930-01-30 | 0 | Details |
| US1740130A | Measuring instrument | Expired / Lapsed | 1928-10-24 | 1929-12-17 | 0 | Details |
| DE487016C | Device for modulating or demodulating a carrier current | Expired / Lapsed | 1927-08-20 | 1929-11-30 | 0 | Details |
| DE476506C | Process for the production of piezoelectric bodies | Expired / Lapsed | 1928-04-18 | 1929-05-22 | 0 | Details |
| DE470454C | Device for measuring the angular acceleration of rotating b… | Expired / Lapsed | 1925-07-14 | 1929-01-15 | 0 | Details |
| US1697221A | Switch-bank contact | Expired / Lapsed | 1922-06-23 | 1929-01-01 | 0 | Details |
| US1695031A | Determining gaseous carbonic acid | Expired / Lapsed | 1926-07-20 | 1928-12-11 | 0 | Details |
| US1689213A | Telephone system | Expired / Lapsed | 1924-06-20 | 1928-10-30 | 0 | Details |
| US1677378A | Device for indicating the quotient of two electrical quanti… | Expired / Lapsed | 1926-10-20 | 1928-07-17 | 0 | Details |
| US1668457A | Rate-of-flow indicator with electric integration for fluids… | Expired / Lapsed | 1921-08-24 | 1928-05-01 | 0 | Details |
| US1665683A | Telephone system | Expired / Lapsed | 1924-10-06 | 1928-04-10 | 0 | Details |
| DE449886C | Arrangement for remote control of movements | Expired / Lapsed | 1926-02-07 | 1927-09-28 | 0 | Details |
| US1606807A | Filter chain | Expired / Lapsed | 1922-09-21 | 1926-11-16 | 0 | Details |
| US1604532A | Electrodynamic telephone | Expired / Lapsed | 1924-05-15 | 1926-10-26 | 0 | Details |
| DE436157C | Method for measuring or recording cutting pressures on mach… | Expired / Lapsed | 1925-04-22 | 1926-10-25 | 0 | Details |
| US1603806A | Filter chain | Expired / Lapsed | 1922-08-08 | 1926-10-19 | 0 | Details |
| US1577909A | Recording venturi meter | Expired / Lapsed | 1921-08-24 | 1926-03-23 | 0 | Details |
| US1553789A | Radiation pyrometer | Expired / Lapsed | 1924-02-01 | 1925-09-15 | 0 | Details |
| DE415272C | Cable with protective cover | Expired / Lapsed | 1923-10-26 | 1925-06-17 | 0 | Details |
| DE412326C | Installation on electrical remote signal transmission syste… | Expired / Lapsed | 1921-10-20 | 1925-04-25 | 0 | Details |
| US1533740A | Pyrometer | Expired / Lapsed | 1921-08-27 | 1925-04-14 | 0 | Details |
| US1508796A | System for adjusting at a distance guns, searchlights, or o… | Expired / Lapsed | 1921-05-12 | 1924-09-16 | 0 | Details |
| US1497512A | Apparatus for the remote adjustment of the traverse of guns… | Expired / Lapsed | 1923-02-09 | 1924-06-10 | 0 | Details |
| DE373239C | Device for determining the carbon dioxide content of gas mi… | Expired / Lapsed | 1922-03-04 | 1923-04-09 | 0 | Details |
| DE369807C | Circuit arrangement for command transmission systems with m… | Expired / Lapsed | 1921-03-19 | 1923-02-23 | 0 | Details |
| US1395653A | Pressure-measuring instrument | Expired / Lapsed | 1919-06-14 | 1921-11-01 | 0 | Details |
| DE322357C | Device for measuring winding temperatures using a resistanc… | Expired / Lapsed | 1919-01-28 | 1920-06-28 | 0 | Details |
| DE322333C | Device for electrical monitoring of slowly changing physica… | Expired / Lapsed | 1918-01-19 | 1920-06-26 | 0 | Details |
| US1215815A | Electric signaling system. | Expired / Lapsed | 1913-06-24 | 1917-02-13 | 0 | Details |
| US1180614A | Highly-refractory article of tantalum and its alloys. | Expired / Lapsed | 1912-10-17 | 1916-04-25 | 0 | Details |
| US1177694A | Telegraphic type-printing receiver. | Expired / Lapsed | 1911-08-19 | 1916-04-04 | 0 | Details |
| US1172080A | Means for closing and opening electric circuits. | Expired / Lapsed | 1913-03-28 | 1916-02-15 | 0 | Details |
| US1164987A | Method of and apparatus for projecting röntgen images. | Expired / Lapsed | 1914-02-03 | 1915-12-21 | 0 | Details |
| US1156317A | Electromedical apparatus. | Expired / Lapsed | 1914-04-24 | 1915-10-12 | 0 | Details |
| US1154127A | Apparatus for neutralizing electric charges in fibrous mate… | Expired / Lapsed | 1913-01-15 | 1915-09-21 | 0 | Details |
| US1151118A | Apparatus for checking electrocardiographs, oscillographs, … | Expired / Lapsed | 1913-04-08 | 1915-08-24 | 0 | Details |
| US1146486A | Electrical instrument for electrically transmitting indicat… | Expired / Lapsed | 1913-08-26 | 1915-07-13 | 0 | Details |
| US1135040A | Electric signaling apparatus. | Expired / Lapsed | 1912-06-28 | 1915-04-13 | 0 | Details |
| US1126826A | System of electrical signaling. | Expired / Lapsed | 1912-07-18 | 1915-02-02 | 0 | Details |
| US1123067A | Means for adjusting from a distance any desired objects. | Expired / Lapsed | 1910-12-24 | 1914-12-29 | 0 | Details |
| FR19067E | High voltage rectifier for alternating current, in which th… | Expired / Lapsed | 1914-03-25 | 1914-09-22 | 0 | Details |
| GB191004967A | Improvements in Sub-aqueous Sound Producers. | Expired / Lapsed | 1910-02-28 | 1910-06-23 | 0 | Details |
| US947146A | Spring for timepieces. | Expired / Lapsed | 1907-06-08 | 1910-01-18 | 0 | Details |
| US925988A | Process of hardening tantalum. | Expired / Lapsed | 1908-03-20 | 1909-06-22 | 0 | Details |
| GB190806051A | An Improved Process for Hardening Tantalum. | Expired / Lapsed | 1908-03-18 | 1908-07-16 | 0 | Details |
| US888153A | System for selecting one of several receivers connected to … | Expired / Lapsed | 1907-12-23 | 1908-05-19 | 0 | Details |
| US870506A | Instrument for determining the position of an organ or the … | Expired / Lapsed | 1907-07-06 | 1907-11-05 | 0 | Details |
| US650096A | Recorder for rapid automatic telegraphy. | Expired / Lapsed | 1900-02-03 | 1900-05-22 | 0 | Details |