Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5396749 | Method of cutting off water flow by grouting | — | 1995-03-14 |
| 5193960 | Washer with elastic water-swellable rubber | Isamu Ichizuka, Hiroshi Inoue, Tokio Ueno | 1993-03-16 |
| 5044835 | Expansion joint for use in constructing concrete structures | Hiroshi Inoue, Yasumasa Hayashida, Makio Takahashi | 1991-09-03 |
| 4905429 | Device for filling up of recess left in concrete wall after removal | Yasumasa Hayashida, Hiroto Gomi, Kuniharu Kikuma | 1990-03-06 |
| 4889312 | Waterstop for concrete form separator | Sunoo Ogou, Shigemichi Ishii, Sadaaki Tagomori, Yasumasa Hayashida | 1989-12-26 |
| 4816509 | Water swellable sealant | Yasumasa Hayashida, Jinichi Omi | 1989-03-28 |