Telefunken AG
TelefunkenActive Patents
0
Total Holdings
183
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| DE1100874B | Arrangement for performing stomach and intestinal examinati… | Expired / Lapsed | 1960-01-16 | — | 0 | Details |
| DE1054505B | Transistor circuit for generating approximately square-wave… | Expired / Lapsed | 1957-02-23 | — | 0 | Details |
| DE1014167B | Wing chair with built-in speakers | Expired / Lapsed | 1955-08-03 | — | 0 | Details |
| GB501121A | Improvements in piezo-electric crystals | Expired / Lapsed | 1938-09-07 | — | 0 | Details |
| GB480572A | Improvements in or relating to direction finding radio rece… | Expired / Lapsed | 1937-06-17 | — | 0 | Details |
| GB460488A | Improvements in or relating to directional radio receivers | Expired / Lapsed | 1936-05-23 | — | 0 | Details |
| GB172321A | Improved calling apparatus for high frequency telegraphy | Expired / Lapsed | 1921-12-02 | — | 0 | Details |
| US3204198A | Circuit arrangement for changing the oscillator frequency o… | Expired / Lapsed | 1960-12-05 | 1965-08-31 | 2 | Details |
| US3181150A | Indicating device | Expired / Lapsed | 1960-11-25 | 1965-04-27 | 2 | Details |
| US3144017A | Pill-type swallowable transmitter | Expired / Lapsed | 1961-01-03 | 1964-08-11 | 2 | Details |
| US3068473A | System for supervision of vehicles | Expired / Lapsed | 1959-11-03 | 1962-12-11 | 0 | Details |
| US3038028A | Arrangement for producing a series of pulses | Expired / Lapsed | 1958-02-07 | 1962-06-05 | 0 | Details |
| US2992144A | Method of forming transistors | Expired / Lapsed | 1959-05-29 | 1961-07-11 | 2 | Details |
| US2962666A | Oscillator synchronizing circuit with variable pull in range | Expired / Lapsed | 1959-10-06 | 1960-11-29 | 0 | Details |
| DE970248C | Arrangement for the use of a telemeter in the form of a mag… | Expired / Lapsed | 1952-11-27 | 1958-08-28 | 0 | Details |
| DE864696C | Condenser microphone | Expired / Lapsed | 1942-04-01 | 1953-01-26 | 0 | Details |
| FR898352A | Improvements to simultaneous or alternative production syst… | Expired / Lapsed | 1943-09-29 | 1945-04-20 | 0 | Details |
| DE734905C | Circuit arrangement for the generation of saw-tooth-shaped … | Expired / Lapsed | 1936-03-13 | 1943-04-30 | 0 | Details |
| US2292722A | Telemetric indicator of corrected angular positions | Expired / Lapsed | 1939-09-05 | 1942-08-11 | 0 | Details |
| US2292161A | Magnetic shielding | Expired / Lapsed | 1940-03-02 | 1942-08-04 | 0 | Details |
| FR873812A | Improvements to image sensor tubes, in particular for telev… | Expired / Lapsed | 1941-07-12 | 1942-07-21 | 0 | Details |
| US2285857A | Receiver | Expired / Lapsed | 1937-11-11 | 1942-06-09 | 0 | Details |
| US2282856A | Magnetron oscillator | Expired / Lapsed | 1941-04-17 | 1942-05-12 | 0 | Details |
| DE720448C | Push-pull shortwave tubes with two discharge systems within… | Expired / Lapsed | 1937-08-26 | 1942-05-06 | 0 | Details |
| US2281982A | Arrangement for transmitting and receiving wireless messages | Expired / Lapsed | 1940-10-05 | 1942-05-05 | 0 | Details |
| US2281069A | Modulation system | Expired / Lapsed | 1935-02-27 | 1942-04-28 | 0 | Details |
| US2273511A | Means to transform an alternating potential | Expired / Lapsed | 1938-11-02 | 1942-02-17 | 0 | Details |
| US2270922A | Piezoelectric crystal holder | Expired / Lapsed | 1939-10-17 | 1942-01-27 | 0 | Details |
| US2270771A | High frequency oscillation generator | Expired / Lapsed | 1940-10-31 | 1942-01-20 | 0 | Details |
| US2270773A | Impulse direction finder | Expired / Lapsed | 1938-03-08 | 1942-01-20 | 0 | Details |
| US2269249A | Controlled feedback circuit | Expired / Lapsed | 1938-11-29 | 1942-01-06 | 0 | Details |
| US2267951A | Antenna | Expired / Lapsed | 1940-01-24 | 1941-12-30 | 0 | Details |
| US2266920A | Television transmitting tube | Expired / Lapsed | 1939-01-09 | 1941-12-23 | 0 | Details |
| US2266525A | Wave range switching mechanism | Expired / Lapsed | 1940-06-20 | 1941-12-16 | 0 | Details |
| US2265784A | Method of producing electrical oscillations | Expired / Lapsed | 1939-08-31 | 1941-12-09 | 0 | Details |
| US2265833A | Ultra short wave oscillatory circuit | Expired / Lapsed | 1939-06-30 | 1941-12-09 | 0 | Details |
| US2264724A | Receiver for frequency or phase modulated oscillations | Expired / Lapsed | 1939-12-14 | 1941-12-02 | 0 | Details |
| US2258836A | Cathode heater | Expired / Lapsed | 1940-06-19 | 1941-10-14 | 0 | Details |
| US2252447A | Impulse direction-finding method | Expired / Lapsed | 1938-02-11 | 1941-08-12 | 0 | Details |
| US2250581A | Receiver volume control | Expired / Lapsed | 1939-09-26 | 1941-07-29 | 0 | Details |
| US2250706A | Saw-tooth wave generator | Expired / Lapsed | 1938-09-29 | 1941-07-29 | 0 | Details |
| US2250559A | Amplifier gain control circuit | Expired / Lapsed | 1938-07-28 | 1941-07-29 | 0 | Details |
| US2250708A | Time interval measuring means | Expired / Lapsed | 1938-01-13 | 1941-07-29 | 0 | Details |
| US2250090A | Arrangement for tuning high frequency oscillation circuits | Expired / Lapsed | 1939-10-05 | 1941-07-22 | 0 | Details |
| US2249933A | Piezoelectric plate | Expired / Lapsed | 1939-09-26 | 1941-07-22 | 0 | Details |
| US2249420A | Frequency meter | Expired / Lapsed | 1938-08-31 | 1941-07-15 | 0 | Details |
| US2243234A | Wave indication | Expired / Lapsed | 1940-01-18 | 1941-05-27 | 0 | Details |
| US2239906A | Noise control circuit | Expired / Lapsed | 1938-12-13 | 1941-04-29 | 0 | Details |
| US2238129A | Directional radio receiver | Expired / Lapsed | 1937-06-25 | 1941-04-15 | 0 | Details |
| US2237425A | Saw-tooth wave generator | Expired / Lapsed | 1938-06-15 | 1941-04-08 | 0 | Details |
| US2237448A | Overload protection for dynamic loud-speakers | Expired / Lapsed | 1938-06-07 | 1941-04-08 | 0 | Details |
| US2237895A | Impulse direction-finding receiver | Expired / Lapsed | 1938-05-28 | 1941-04-08 | 0 | Details |
| US2227076A | Circuit arrangement for electrostatic deflection of cathode… | Expired / Lapsed | 1939-02-24 | 1940-12-31 | 0 | Details |
| US2227075A | Saw-tooth current generator | Expired / Lapsed | 1939-01-19 | 1940-12-31 | 0 | Details |
| US2226694A | Neutralization circuit for short wave transmitters | Expired / Lapsed | 1938-02-02 | 1940-12-31 | 0 | Details |
| US2227108A | Signaling system | Expired / Lapsed | 1937-02-19 | 1940-12-31 | 0 | Details |
| US2223995A | Impulse reception | Expired / Lapsed | 1938-04-20 | 1940-12-03 | 0 | Details |
| US2222668A | Infrared ray generator and communication system | Expired / Lapsed | 1938-07-15 | 1940-11-26 | 0 | Details |
| US2220964A | Television transmitter tube | Expired / Lapsed | 1938-01-21 | 1940-11-12 | 0 | Details |
| US2220688A | Arrangement for receiving television images | Expired / Lapsed | 1937-05-27 | 1940-11-05 | 0 | Details |
| US2219506A | Tuning indicator circuit | Expired / Lapsed | 1937-10-08 | 1940-10-29 | 0 | Details |
| US2219653A | Transmission line | Expired / Lapsed | 1936-12-16 | 1940-10-29 | 0 | Details |
| US2219003A | Trimming condenser | Expired / Lapsed | 1939-01-17 | 1940-10-22 | 0 | Details |
| US2218636A | Radio transmitter synchronization | Expired / Lapsed | 1938-07-29 | 1940-10-22 | 0 | Details |
| US2212128A | Antenna | Expired / Lapsed | 1939-05-06 | 1940-08-20 | 0 | Details |
| US2212110A | Radio beacon system | Expired / Lapsed | 1937-08-04 | 1940-08-20 | 0 | Details |
| US2212249A | Electronic device | Expired / Lapsed | 1936-09-10 | 1940-08-20 | 0 | Details |
| US2205874A | Arrangement for matching a high frequency radiator to a tra… | Expired / Lapsed | 1937-12-24 | 1940-06-25 | 0 | Details |
| US2205582A | Method of sealing glass | Expired / Lapsed | 1937-12-18 | 1940-06-25 | 0 | Details |
| US2205866A | Capacitive radio frequency voltage divider | Expired / Lapsed | 1937-11-26 | 1940-06-25 | 0 | Details |
| US2204962A | Automatic volume control | Expired / Lapsed | 1938-09-29 | 1940-06-18 | 0 | Details |
| US2202380A | Confined or space resonance antenna | Expired / Lapsed | 1937-11-11 | 1940-05-28 | 0 | Details |
| US2202605A | Television system | Expired / Lapsed | 1937-08-07 | 1940-05-28 | 0 | Details |
| US2202511A | Black spot compensation apparatus | Expired / Lapsed | 1937-04-28 | 1940-05-28 | 0 | Details |
| US2202527A | Cathode ray switch | Expired / Lapsed | 1936-09-10 | 1940-05-28 | 0 | Details |
| US2195103A | Television system | Expired / Lapsed | 1936-03-26 | 1940-03-26 | 0 | Details |
| US2194175A | Distortion reducing arrangement | Expired / Lapsed | 1938-08-04 | 1940-03-19 | 0 | Details |
| US2193868A | Circuit arrangement for producing an impulse series | Expired / Lapsed | 1937-06-17 | 1940-03-19 | 0 | Details |
| US2192975A | Method of sending and receiving radio frequency impulses | Expired / Lapsed | 1938-01-27 | 1940-03-12 | 0 | Details |
| US2189284A | Adjustable two-pole capacitive coupler | Expired / Lapsed | 1937-11-26 | 1940-02-06 | 0 | Details |
| US2189584A | Transmitter | Expired / Lapsed | 1937-06-18 | 1940-02-06 | 0 | Details |
| US2187575A | Antenna winch for aircraft | Expired / Lapsed | 1938-06-25 | 1940-01-16 | 0 | Details |
| US2183260A | Phase displacement detector | Expired / Lapsed | 1937-04-16 | 1939-12-12 | 0 | Details |
| US2182555A | Saw-tooth wave generator | Expired / Lapsed | 1937-07-24 | 1939-12-05 | 0 | Details |
| US2182608A | Saw-tooth wave generator | Expired / Lapsed | 1937-03-17 | 1939-12-05 | 0 | Details |
| US2181568A | Impulse or pulse transmitter | Expired / Lapsed | 1937-01-13 | 1939-11-28 | 0 | Details |
| US2181309A | Electrical impulse segregation circuit | Expired / Lapsed | 1936-05-21 | 1939-11-28 | 0 | Details |
| US2180710A | Cathode ray tube screen | Expired / Lapsed | 1937-04-19 | 1939-11-21 | 0 | Details |
| US2178340A | Wave form modifying circuits | Expired / Lapsed | 1937-03-29 | 1939-10-31 | 0 | Details |
| US2178074A | Electrical measuring system | Expired / Lapsed | 1936-10-09 | 1939-10-31 | 0 | Details |
| US2175320A | Remote control device for radio receivers | Expired / Lapsed | 1938-07-09 | 1939-10-10 | 0 | Details |
| US2175335A | Television synchronizing circuits | Expired / Lapsed | 1937-05-06 | 1939-10-10 | 0 | Details |
| US2173643A | Radio frequency cable terminal | Expired / Lapsed | 1936-01-21 | 1939-09-19 | 0 | Details |
| US2172775A | Optical system | Expired / Lapsed | 1936-01-28 | 1939-09-12 | 0 | Details |
| US2171212A | Electron discharge device | Expired / Lapsed | 1937-03-27 | 1939-08-29 | 0 | Details |
| US2169714A | Black spot correcting means | Expired / Lapsed | 1937-05-13 | 1939-08-15 | 0 | Details |
| US2167462A | Variable electric filter | Expired / Lapsed | 1937-03-04 | 1939-07-25 | 0 | Details |
| US2166124A | Method of detecting high-frequency oscillations | Expired / Lapsed | 1937-11-03 | 1939-07-18 | 0 | Details |
| US2163266A | Double mosaic screen | Expired / Lapsed | 1937-01-09 | 1939-06-20 | 0 | Details |
| US2162239A | Electric indicating device | Expired / Lapsed | 1937-03-10 | 1939-06-13 | 0 | Details |
| US2160853A | Reflector arrangement | Expired / Lapsed | 1936-03-25 | 1939-06-06 | 0 | Details |
| US2159792A | Relaxation oscillation generator | Expired / Lapsed | 1937-06-02 | 1939-05-23 | 0 | Details |
| US2158314A | Cathode ray tube | Expired / Lapsed | 1936-07-15 | 1939-05-16 | 0 | Details |
| US2157576A | Arrangement of oscillation crystals | Expired / Lapsed | 1937-06-18 | 1939-05-09 | 0 | Details |
| US2157665A | Crystal mounting with temperature compensation | Expired / Lapsed | 1936-10-17 | 1939-05-09 | 0 | Details |
| US2156653A | Ultra short wave system | Expired / Lapsed | 1936-05-22 | 1939-05-02 | 0 | Details |
| US2153628A | Electron tube | Expired / Lapsed | 1936-03-17 | 1939-04-11 | 0 | Details |
| US2151765A | Device for generating electrical oscillations | Expired / Lapsed | 1937-03-10 | 1939-03-28 | 0 | Details |
| US2151323A | Radio apparatus for determining distance and direction | Expired / Lapsed | 1936-05-23 | 1939-03-21 | 0 | Details |
| US2151336A | Radio signaling apparatus | Expired / Lapsed | 1935-07-05 | 1939-03-21 | 0 | Details |
| US2145676A | Multiwave range receiver | Expired / Lapsed | 1936-11-17 | 1939-01-31 | 0 | Details |
| US2140016A | Wave meter | Expired / Lapsed | 1937-09-25 | 1938-12-13 | 0 | Details |
| US2139467A | Serrated wave form generator | Expired / Lapsed | 1936-10-30 | 1938-12-06 | 0 | Details |
| US2138138A | Transmitter circuit | Expired / Lapsed | 1936-11-21 | 1938-11-29 | 0 | Details |
| US2137202A | Electron tube | Expired / Lapsed | 1934-07-20 | 1938-11-15 | 0 | Details |
| US2131185A | Electrooptical device | Expired / Lapsed | 1936-02-24 | 1938-09-27 | 0 | Details |
| US2131443A | Signaling | Expired / Lapsed | 1934-05-16 | 1938-09-27 | 0 | Details |
| US2130389A | Antenna | Expired / Lapsed | 1936-06-05 | 1938-09-20 | 0 | Details |
| US2130124A | Electron discharge device | Expired / Lapsed | 1936-10-28 | 1938-09-13 | 0 | Details |
| US2128395A | Measuring instrument | Expired / Lapsed | 1937-05-19 | 1938-08-30 | 0 | Details |
| US2125953A | Receiver of telephonic or telegraphic signals | Expired / Lapsed | 1937-05-28 | 1938-08-09 | 0 | Details |
| US2124404A | Television scanning system | Expired / Lapsed | 1934-03-08 | 1938-07-19 | 0 | Details |
| US2119115A | Mica condenser | Expired / Lapsed | 1934-11-08 | 1938-05-31 | 0 | Details |
| US2116717A | Distance and direction determining system | Expired / Lapsed | 1935-06-25 | 1938-05-10 | 0 | Details |
| US2116217A | Visual indicator for tuning means | Expired / Lapsed | 1935-09-19 | 1938-05-03 | 0 | Details |
| US2115521A | Magnetron | Expired / Lapsed | 1937-04-07 | 1938-04-26 | 0 | Details |
| US2112283A | Direction finding system | Expired / Lapsed | 1936-06-25 | 1938-03-29 | 0 | Details |
| US2112282A | Ultrashort wave antenna system | Expired / Lapsed | 1935-08-10 | 1938-03-29 | 0 | Details |
| US2103357A | Ultrashort wave system | Expired / Lapsed | 1936-07-18 | 1937-12-28 | 0 | Details |
| US2101525A | Linear amplifier circuit | Expired / Lapsed | 1934-12-18 | 1937-12-07 | 0 | Details |
| US2100156A | Phase modulation | Expired / Lapsed | 1936-01-21 | 1937-11-23 | 0 | Details |
| US2097072A | Transmitter arrangement for guiding airplanes | Expired / Lapsed | 1935-03-09 | 1937-10-26 | 0 | Details |
| US2086742A | Radio receiving system | Expired / Lapsed | 1935-07-17 | 1937-07-13 | 0 | Details |
| US2085798A | Radio system for locating objects | Expired / Lapsed | 1936-06-12 | 1937-07-06 | 0 | Details |
| US2086229A | Radio receiving system | Expired / Lapsed | 1935-04-30 | 1937-07-06 | 0 | Details |
| US2085905A | Circuit arrangement for regulating transmission measure in … | Expired / Lapsed | 1934-09-12 | 1937-07-06 | 0 | Details |
| US2085022A | Method of tuning receivers operating on potential resonance | Expired / Lapsed | 1935-04-15 | 1937-06-29 | 0 | Details |
| US2084867A | Magnetically biased electron discharge device | Expired / Lapsed | 1935-03-01 | 1937-06-22 | 0 | Details |
| US2065826A | Signaling | Expired / Lapsed | 1934-02-03 | 1936-12-29 | 0 | Details |
| US2057857A | Variable-gain amplifier arrangement | Expired / Lapsed | 1933-12-13 | 1936-10-20 | 0 | Details |
| US2054659A | Electric condenser | Expired / Lapsed | 1934-10-04 | 1936-09-15 | 0 | Details |
| US2050737A | Light translating apparatus | Expired / Lapsed | 1933-07-03 | 1936-08-11 | 0 | Details |
| US2049677A | Heterodyne receiver | Expired / Lapsed | 1932-12-30 | 1936-08-04 | 0 | Details |
| US2046849A | Antenna system | Expired / Lapsed | 1935-07-17 | 1936-07-07 | 0 | Details |
| US2042606A | Variable resistor unit | Expired / Lapsed | 1933-05-11 | 1936-06-02 | 0 | Details |
| US2036833A | Tuning condenser arrangement | Expired / Lapsed | 1931-08-06 | 1936-04-07 | 0 | Details |
| US2033937A | Receiver for ultra short waves | Expired / Lapsed | 1934-07-19 | 1936-03-17 | 0 | Details |
| US2034520A | Radio receiver arrangement for landing aircraft | Expired / Lapsed | 1933-04-17 | 1936-03-17 | 0 | Details |
| US2031072A | Method of and means for signaling | Expired / Lapsed | 1932-05-05 | 1936-02-18 | 0 | Details |
| US2027193A | Thermostat arrangement | Expired / Lapsed | 1933-09-15 | 1936-01-07 | 0 | Details |
| US2019765A | Frequency stabilization | Expired / Lapsed | 1932-12-07 | 1935-11-05 | 0 | Details |
| US2015178A | Method for the stabilization of electromagnetic oscillations | Expired / Lapsed | 1933-12-08 | 1935-09-24 | 0 | Details |
| US2014509A | Radioreceiver | Expired / Lapsed | 1932-06-06 | 1935-09-17 | 0 | Details |
| US2004177A | Light amplifier | Expired / Lapsed | 1932-01-19 | 1935-06-11 | 0 | Details |
| US1996737A | Quartz oscillator arrangement | Expired / Lapsed | 1932-04-14 | 1935-04-09 | 0 | Details |
| US1997479A | Photoconductive device and method of making it | Expired / Lapsed | 1931-11-05 | 1935-04-09 | 0 | Details |
| US1994076A | Temperature control | Expired / Lapsed | 1932-03-02 | 1935-03-12 | 0 | Details |
| US1994228A | Temperature control of piezo-electric crystal apparatus | Expired / Lapsed | 1932-02-16 | 1935-03-12 | 0 | Details |
| US1990649A | Transmitting or receiving arrangement for concentrated elec… | Expired / Lapsed | 1932-12-01 | 1935-02-12 | 0 | Details |
| US1988605A | Luminescent screen | Expired / Lapsed | 1932-08-19 | 1935-01-22 | 0 | Details |
| US1978818A | Frequency stabilization | Expired / Lapsed | 1931-01-31 | 1934-10-30 | 0 | Details |
| US1977999A | Cathode ray oscillograph | Expired / Lapsed | 1933-03-16 | 1934-10-23 | 0 | Details |
| US1976400A | Cathode ray scanning device | Expired / Lapsed | 1931-05-21 | 1934-10-09 | 0 | Details |
| US1971383A | Transmitter | Expired / Lapsed | 1933-02-15 | 1934-08-28 | 0 | Details |
| US1969328A | Radio transmitting circuit | Expired / Lapsed | 1932-05-04 | 1934-08-07 | 0 | Details |
| US1969379A | Apparatus for making piezo-electric bodies | Expired / Lapsed | 1929-11-12 | 1934-08-07 | 0 | Details |
| US1965632A | Means for measuring distances | Expired / Lapsed | 1930-11-18 | 1934-07-10 | 0 | Details |
| US1960006A | Antenna system | Expired / Lapsed | 1931-12-18 | 1934-05-22 | 0 | Details |
| US1955093A | Oscillation circuit for electric waves | Expired / Lapsed | 1930-07-07 | 1934-04-17 | 0 | Details |
| US1934211A | Receiving arrangement for radiosignals | Expired / Lapsed | 1929-01-30 | 1933-11-07 | 0 | Details |
| US1932469A | Short wave signaling | Expired / Lapsed | 1930-12-02 | 1933-10-31 | 0 | Details |
| DE584954C | Device for remote monitoring of measuring instruments | Expired / Lapsed | 1927-02-24 | 1933-09-27 | 0 | Details |
| US1911091A | Signaling | Expired / Lapsed | 1929-09-03 | 1933-05-23 | 0 | Details |
| US1892221A | Polarization diversity reception | Expired / Lapsed | 1929-01-30 | 1932-12-27 | 0 | Details |
| US1867179A | Telegraphone | Expired / Lapsed | 1930-10-09 | 1932-07-12 | 0 | Details |
| US1863798A | Circuit arrangement for transmitter tubes | Expired / Lapsed | 1927-01-25 | 1932-06-21 | 0 | Details |
| US1792756A | Modulation system | Expired / Lapsed | 1925-10-22 | 1931-02-17 | 0 | Details |
| US1791938A | Safety device for railroad operation | Expired / Lapsed | 1929-11-16 | 1931-02-10 | 0 | Details |
| US1789369A | Means for indicating changes in gases | Expired / Lapsed | 1927-06-30 | 1931-01-20 | 0 | Details |
| US1708530A | Apparatus for the generation of short electrical waves | Expired / Lapsed | 1925-07-15 | 1929-04-09 | 0 | Details |
| US1708544A | Method and arrangement for electrical measurements | Expired / Lapsed | 1925-04-06 | 1929-04-09 | 0 | Details |
| DE467594C | Method of manufacturing piezo-electric plates | Expired / Lapsed | 1927-07-28 | 1928-10-26 | 0 | Details |
| US958181A | Receiver for wireless telegraphy. | Expired / Lapsed | 1906-08-31 | 1910-05-17 | 0 | Details |