Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5169467 | Ink occlusion material for writing utensils | Kenji Arai, Toshihiro Yamamoto | 1992-12-08 |
| 4981531 | Process for producing cold rolled steel sheets having excellent press formability and ageing property | Hiroshi Katoh, Hiromi Toyota, Kazuo Koyama | 1991-01-01 |
| 4970854 | Ink occlusion material for writing utensils | Kenji Arai, Toshihiro Yamamoto | 1990-11-20 |
| 4443272 | Process for producing cold rolled steel sheets having excellent press formability and ageing property | Hiroshi Katoh, Hiromi Toyota, Kazuo Koyama | 1984-04-17 |