Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4756952 | Water-swellable caulking material for water-leakage prevention | Yuji Ishihara | 1988-07-12 |
| 4740404 | Waterstop | Shozo Otsugu, Michiyoshi Terauchi, Yuji Ishihara, Takashi Kushida | 1988-04-26 |
| 4211851 | Process for the preparation of self-swelling leakage-preventing materials | — | 1980-07-08 |