Sonotone Corp
Sonotone CActive Patents
0
Total Holdings
9
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2863076A | Dielectrostrictive signal and energy transducers | Expired / Lapsed | 1956-10-19 | 1958-12-02 | 0 | Details |
| US2487038A | Ear insert for earphones | Expired / Lapsed | 1944-03-25 | 1949-11-08 | 0 | Details |
| US2464272A | Electrode assembly for electron space discharge device | Expired / Lapsed | 1945-12-08 | 1949-03-15 | 0 | Details |
| US2327321A | Hearing aid amplifier | Expired / Lapsed | 1941-11-12 | 1943-08-17 | 0 | Details |
| US2327320A | Amplifying hearing aid | Expired / Lapsed | 1941-11-12 | 1943-08-17 | 0 | Details |
| US2327137A | Hearing aid microphone | Expired / Lapsed | 1941-05-21 | 1943-08-17 | 0 | Details |
| US2045403A | Piezoelectric device | Expired / Lapsed | 1933-05-24 | 1936-06-23 | 0 | Details |
| US2045404A | Piezoelectric vibrator device | Expired / Lapsed | 1933-05-24 | 1936-06-23 | 0 | Details |
| US1811638A | Earphone transmitter | Expired / Lapsed | 1929-12-09 | 1931-06-23 | 0 | Details |