Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D917031 | Heat exchanger for water heater | Takeshi Oohigashi, Masaki Kondo | 2021-04-20 |
| D916257 | Heat exchanger for water heater | Takeshi Oohigashi, Masaki Kondo | 2021-04-13 |
| D916258 | Heat exchanger for water heater | Takeshi Oohigashi, Masaki Kondo | 2021-04-13 |
| 10948236 | Heat exchanger and water heater including same | Takeshi Ohigashi, Nobuhiro Takeda | 2021-03-16 |
| 10890356 | Heat exchange device and heat source machine | Naoya Shiotsu, Takeshi Ohigashi, Masaki Kondo | 2021-01-12 |