Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6303711 | Water-absorbent or water-retention material and production method thereof | Takashi Sumiya, Masami Koike, Yoji Fujiura | 2001-10-16 |
| 6130304 | Water-absorbent or water-retention material and production method thereof | Takashi Sumiya, Masami Koike, Yoji Fujiura | 2000-10-10 |