Sonotone Corp
Sonotone CActive Patents
0
Total Holdings
16
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3538232A | Musical instrument and piezoelectric pickup with diaphragms… | Expired / Lapsed | 1968-08-12 | 1970-11-03 | 0 | Details |
| US2934610A | Sound-record transducing device for stereophonic and like r… | Expired / Lapsed | 1958-06-09 | 1960-04-26 | 0 | Details |
| US2878375A | Portable radio broadcast receiver with removable speaker | Expired / Lapsed | 1955-02-21 | 1959-03-17 | 0 | Details |
| US2863076A | Dielectrostrictive signal and energy transducers | Expired / Lapsed | 1956-10-19 | 1958-12-02 | 0 | Details |
| US2511482A | Method of testing hearing | Expired / Lapsed | 1943-09-17 | 1950-06-13 | 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 |
| US2401411A | Frequency response testing system | Expired / Lapsed | 1942-07-30 | 1946-06-04 | 0 | Details |
| US2327320A | Amplifying hearing aid | Expired / Lapsed | 1941-11-12 | 1943-08-17 | 0 | Details |
| US2327321A | Hearing aid amplifier | Expired / Lapsed | 1941-11-12 | 1943-08-17 | 0 | Details |
| US2327137A | Hearing aid microphone | Expired / Lapsed | 1941-05-21 | 1943-08-17 | 0 | Details |
| US2064426A | Hearing-aid device | Expired / Lapsed | 1934-09-01 | 1936-12-15 | 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 |
| US1893474A | Earpiece for ear phones | Expired / Lapsed | 1931-05-27 | 1933-01-03 | 0 | Details |
| US1811638A | Earphone transmitter | Expired / Lapsed | 1929-12-09 | 1931-06-23 | 0 | Details |