Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4761967 | Car air conditioner with heat storage tank for cooling energy | Seiji Sumikawa, Shinji Sutoh | 1988-08-09 |
| 4266604 | Heat exchanger with fluid tanks made of synthetic resin | Seiji Sumikawa, Hiroshi Niizuma, Hiromichi Tonegawa, Tsuneo Torizuka, Norio Takashima | 1981-05-12 |