Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4932429 | Screw stopper including anti-freeze device used for water pipe valve | Masatoshi Watanabe, Shinichi Hayakawa, Shiro Tsuji, Yasuyuki Sumigama, Naotake Okada | 1990-06-12 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4932429 | Screw stopper including anti-freeze device used for water pipe valve | Masatoshi Watanabe, Shinichi Hayakawa, Shiro Tsuji, Yasuyuki Sumigama, Naotake Okada | 1990-06-12 |