Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6975741 | Electroacoustic transducer being acoustical tight in the area of its air gap for its moving coil | — | 2005-12-13 |
| 6717305 | Apparatus having an electroacoustic transducer forming a sound reproducing means and a part of vibration generating means | Ernst Ruberl, Juha Backman | 2004-04-06 |
| 6681024 | Device including a built-in electroacoustic transducer for optimum speech reproduction | Erich Klein | 2004-01-20 |
| 6542614 | Boomless hearing/speaking configuration for sound receiving means | — | 2003-04-01 |
| 4858719 | Pressure gradient pickup | Werner Fidi | 1989-08-22 |
| 4199667 | Microphone having means for suppressing structure-borne sounds | — | 1980-04-22 |