DICTOGRAPH PRODUCTS CO Inc
DICTOGRAPHActive Patents
0
Total Holdings
6
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2886623A | Battery assembly for hearing aids | Expired / Lapsed | 1954-03-24 | 1959-05-12 | 0 | Details |
| US2842623A | Transistor amplifier for telephone instrument | Expired / Lapsed | 1954-06-11 | 1958-07-08 | 0 | Details |
| US2497336A | Casing for unitary hearing aids | Expired / Lapsed | 1946-10-31 | 1950-02-14 | 0 | Details |
| US2475802A | Molding composition | Expired / Lapsed | 1945-03-07 | 1949-07-12 | 0 | Details |
| US2394569A | Fitting hearing aid device | Expired / Lapsed | 1941-07-14 | 1946-02-12 | 0 | Details |
| US2336828A | Portable microphone and amplifier | Expired / Lapsed | 1941-02-11 | 1943-12-14 | 0 | Details |