Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5615978 | Management system for water-barrier sheet | Masatoshi Kushima, Eiji Takahashi | 1997-04-01 |
| 5375944 | Waste disposing ground or facility | Kazuo Touge, Hiroki Ogata | 1994-12-27 |