Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5348372 | Tilting control assembly for chair | Shunichi Takamatsu, Katsunori Hama, Hiroshi Iwabuchi | 1994-09-20 |
| 5224758 | Tilting control assembly for chair | Shunichi Takamatsu, Katsunori Hama, Hiroshi Iwabuchi | 1993-07-06 |