Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12313296 | Heat exchanger and water heater | Takeshi Ohigashi, Shigeo Sugie, Norihide Wada, Naoya Shiotsu | 2025-05-27 |
| 11832604 | Hunting and fishing harpoon machete | Kounosuke Horiuchi, Ryohei Wano | 2023-12-05 |
| 11624526 | Heat exchanger and water heating device including the same | Takeshi Ohigashi | 2023-04-11 |
| 10634348 | Combustion apparatus overheating device | Yasushi Kashihara, Toshihiko Hamagami | 2020-04-28 |
| D679790 | Water heater | Jun Doi, Hiroaki Tanaka, Tetsunori Kuriyama, Takahide Hasegawa, Eiji Kanki | 2013-04-09 |
| 6068224 | Camera supporting structure | — | 2000-05-30 |
| 5918886 | Keyless drill chuck | Masayuki Sato | 1999-07-06 |