DRAHTLOSE TELEGRAPHIE MBH
DRAHTLOSEActive Patents
0
Total Holdings
10
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US1792752A | Light control | Expired / Lapsed | 1927-03-21 | 1931-02-17 | 0 | Details |
| US1792766A | Electric-light relay | Expired / Lapsed | 1927-01-05 | 1931-02-17 | 0 | Details |
| US1743124A | Arrangement for eliminating atmospheric disturbances | Expired / Lapsed | 1925-07-28 | 1930-01-14 | 0 | Details |
| US1721492A | Method of and arrangement for multiplex telephony | Expired / Lapsed | 1923-11-23 | 1929-07-16 | 0 | Details |
| US1717630A | Amplifier | Expired / Lapsed | 1925-12-30 | 1929-06-18 | 0 | Details |
| US1708524A | Railway signaling | Expired / Lapsed | 1925-12-02 | 1929-04-09 | 0 | Details |
| US1691222A | Speed-control means for high-frequency generators | Expired / Lapsed | 1926-04-02 | 1928-11-13 | 0 | Details |
| US1559992A | Arrangement for frequency transformation particularly for o… | Expired / Lapsed | 1922-08-18 | 1925-11-03 | 0 | Details |
| US1506358A | Sending arrangement for wireless telegraphy | Expired / Lapsed | 1921-09-03 | 1924-08-26 | 0 | Details |
| US1489158A | Arrangement for the audible receiving of undamped oscillati… | Expired / Lapsed | 1922-08-18 | 1924-04-01 | 0 | Details |