Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8131457 | Navigation terminal device and navigation method | Toshie Shirahama | 2012-03-06 |
| 7098923 | Navigation terminal device and navigation method | Toshie Shirahama | 2006-08-29 |
| 6871142 | Navigation terminal device and navigation method | Toshie Shirahama | 2005-03-22 |
| 6519344 | Audio system | Kiyoshi Yajima | 2003-02-11 |
| 6477255 | Audio system | Minoru Yoshida, Fumio Matsushita, Yoshiki Ohta | 2002-11-05 |
| 6038325 | Speaker system for use in an automobile vehicle | Minoru Yoshida, Fumio Matsushita, Yoshiki Ohta | 2000-03-14 |
| 5854847 | Speaker system for use in an automobile vehicle | Minoru Yoshida, Keishi Saito, Fumio Matsushita, Katsumi Amano, Yoshiki Ohta | 1998-12-29 |
| 5848173 | Surroundless loudspeaker | Yoko Sato, Ziging Zhang, Junko Oba, Shinji Koyano, Takashi Morishige +9 more | 1998-12-08 |