Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D348571 | Chair | Hironaga Obata, Yuji Ishi, Toru Nagao | 1994-07-12 |
| D346909 | Chair | Hironaga Obata, Yuji Ishi, Toru Nagao | 1994-05-17 |
| 5238294 | Interlocking mechanism for supporting seat and seat back of chair | Yuji Ishi, Toru Nagao, Hironaga Obata, Yasuo Uematsu | 1993-08-24 |