Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12292124 | Check valve | Nobuyuki Ishizaki, Eiji Hara | 2025-05-06 |
| D1057094 | Check valve | Nobuyuki Ishizaki, Eiji Hara | 2025-01-07 |
| 11828373 | Check valve | Nobuyuki Ishizaki, Kazuhiro Ota, Daisuke Kikuchi, Kazuhiko Kojima, Futoshi Hasegawa +2 more | 2023-11-28 |
| 10907743 | Check valve and reciprocating body for check valve | Nobuyuki Ishizaki, Daisuke Kikuchi, Kazuhiko Kojima, Futoshi Hasegawa, Kohei Mizutani | 2021-02-02 |