Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8660279 | Nested compound loudspeaker drive unit | — | 2014-02-25 |
| 8452032 | Nested compound loudspeaker drive unit | Ilpo Martikainen | 2013-05-28 |
| D521494 | Loudspeaker | Harri Koskinen, Markku Kulomäki, Ilpo Martikainen, Jari Makinen | 2006-05-23 |
| 6795557 | Sound reproduction equipment and method for reducing the level of acoustical reflections in a room | Aki Mäkivirta | 2004-09-21 |
| 6373956 | Method and arrangement for attenuating mechanical resonance in a loudspeaker | Aki Mäkivirta | 2002-04-16 |
| D391260 | Speaker | Jari Makinen, Jouni Teittinen | 1998-02-24 |