Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D599256 | Stair-climbing chair | Tomoko Kawakami, Chiaki Murata | 2009-09-01 |
| 6679353 | Stair-climbing chair system | — | 2004-01-20 |
| 6332512 | Chair type stair elevating device | — | 2001-12-25 |