Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11041657 | Hot-water supply apparatus | Kentaro Mori | 2021-06-22 |
| 5417566 | Method of preventing burning resonance noise and a burner plate | Hideaki Ishikawa | 1995-05-23 |
| 4737102 | Burner for water heater | Yoshihiro Ishikawa | 1988-04-12 |