Patent Explorer
Browse, filter, and analyze 133 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| GB1020404A | Improvements in or relating to telephone systems | Siemens and Halske AG | Expired / Lapsed | 1964-06-03 | — | 1984-06-03 | 0.0 yrs | 0 | |
| DE1006169B | Arrangement for converting mechanical into electrical vibrations | Siemens and Halske AG | Expired / Lapsed | 1952-02-07 | — | 1972-02-07 | 0.0 yrs | 0 | |
| GB912328A | Improvements in or relating to drive mechanisms | Siemens and Halske AG | Expired / Lapsed | 1960-04-14 | — | 1980-04-14 | 0.0 yrs | 0 | |
| GB442555A | Improvements in or relating to traffic control systems | Siemens and Halske AG | Expired / Lapsed | 1934-08-17 | — | 1954-08-17 | 0.0 yrs | 0 | |
| GB343893A | Improvements in or relating to sound reproducing apparatus | Siemens and Halske AG | Expired / Lapsed | 1929-11-20 | — | 1949-11-20 | 0.0 yrs | 0 | |
| GB267556A | Improvements in or relating to electric signalling systems | Siemens and Halske AG | Expired / Lapsed | 1927-03-12 | — | 1947-03-12 | 0.0 yrs | 0 | |
| GB369546A | An improved light-electric arrangement with selenium cells | Siemens and Halske AG | Expired / Lapsed | 1930-09-16 | — | 1950-09-16 | 0.0 yrs | 0 | |
| GB719121A | Improvements in road traffic signalling installations | Siemens and Halske AG | Expired / Lapsed | 1952-10-29 | — | 1972-10-29 | 0.0 yrs | 0 | |
| GB431946A | Improvements in or relating to telephone systems | Siemens and Halske AG | Expired / Lapsed | 1934-01-18 | — | 1954-01-18 | 0.0 yrs | 0 | |
| GB300640A | Depolarising plate for galvanic cells | Siemens and Halske AG | Expired / Lapsed | 1928-11-03 | — | 1948-11-03 | 0.0 yrs | 0 | |
| GB371421A | A system for supervising and controlling the parts of electrical distribution networks | Siemens and Halske AG | Expired / Lapsed | 1930-10-23 | — | 1950-10-23 | 0.0 yrs | 0 | |
| GB383286A | Improvements in or relating to electrical oscillation generators incorporating glow discharge tubes | Siemens and Halske AG | Expired / Lapsed | 1931-07-31 | — | 1951-07-31 | 0.0 yrs | 0 | |
| US3347992A | Circuit arrangement controlling the release of lines in a communication system | Siemens and Halske AG | Expired / Lapsed | 1963-09-18 | 1967-10-17 | 1983-09-18 | 0.0 yrs | 2 | |
| US3335233A | Transducer for converting mechanical into electrical oscillations | Siemens and Halske AG | Expired / Lapsed | 1963-11-13 | 1967-08-08 | 1983-11-13 | 0.0 yrs | 2 | |
| US3293074A | Method and apparatus for growing monocrystalline layers on monocrystalline substrates of semiconductor material | Siemens and Halske AG | Expired / Lapsed | 1964-11-04 | 1966-12-20 | 1984-11-04 | 0.0 yrs | 2 | |
| US3287506A | Semiconductor-based electro-acoustic transducer | Siemens and Halske AG | Expired / Lapsed | 1964-12-14 | 1966-11-22 | 1984-12-14 | 0.0 yrs | 2 | |
| US3284778A | Processor systems with index registers for address modification in digital computers | Siemens and Halske AG | Expired / Lapsed | 1963-02-28 | 1966-11-08 | 1983-02-28 | 0.0 yrs | 2 | |
| US3271521A | Circuit arrangement for ascertaining operating conditions of subscriber stations of a time multiplex communication system | Siemens and Halske AG | Expired / Lapsed | 1961-05-08 | 1966-09-06 | 1981-05-08 | 0.0 yrs | 2 | |
| US3267213A | Method of and circuit arrangement for securing teleprinter messages | Siemens and Halske AG | Expired / Lapsed | 1960-10-04 | 1966-08-16 | 1980-10-04 | 0.0 yrs | 2 | |
| US3236957A | Device for converting mechanical into electrical oscillations | Siemens and Halske AG | Expired / Lapsed | 1962-02-27 | 1966-02-22 | 1982-02-27 | 0.0 yrs | 2 |
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