Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6480787 | GPS receiving system | Shoji Yoshikawa, Katsuhiko Yamada | 2002-11-12 |
| 6166684 | Artificial satellite navigation system and method | Shoji Yoshikawa, Katsuhiko Yamada, Hiroshi Koyama | 2000-12-26 |