Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5277009 | Exterior wall units comprising siding members and tiles | Kenji Yamaguchi, Shun Kobayashi | 1994-01-11 |
| 5115601 | Movable sky light | Kenji Yamaguchi, Kenji Hosoyama, Daisuke Hozumi | 1992-05-26 |
| 4837877 | Elevation bed | Takeaki Hamada, Akio Okada, Kiyoshi Abe, Katsuhiro Udagawa, Kouji Fujino | 1989-06-13 |