Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6852402 | Dielectric cellular electret film and procedure for its manufacture | Kari Kirjavainen, Keijo Korhonen, Jyrki Kroger | 2005-02-08 |
| 6242683 | Stringed musical instrument transducer and method for forming a stringed musical instrument transducer | Heikki Raisanen | 2001-06-05 |
| 6078006 | Stringed musical instrument transducer and procedure for its fabrication | Heikki Raisanen | 2000-06-20 |
| 5917437 | Keyboard | Jukka Ojala | 1999-06-29 |