Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9518762 | Hot water supply system, water heater and hot water supply control method | Kazuhiko Nakagawa, Katumi Naitoh | 2016-12-13 |
| 9182159 | Water heater and control method therefor | Kazuhiko Nakagawa, Katumi Naitoh | 2015-11-10 |
| 8868251 | Hot water supply system, water heater and hot water supply control method | Kazuhiko Nakagawa, Katumi Naitoh | 2014-10-21 |