Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8180207 | Heat exchanger | Shigeru Shirai, Yasuhiro Umekage, Kazushige Nakamura, Keiko Yasui | 2012-05-15 |
| 7920779 | Heat exchanger and washing apparatus comprising the same | Shigeru Shirai, Yasuhiro Umekage, Kazushige Nakamura, Keiko Yasui, Koji Oka | 2011-04-05 |
| 7834294 | Heating device and sanitary washing device using the same | Shigeru Shirai, Tomohide Matsumoto, Kazushige Nakamura, Takemi Oketa | 2010-11-16 |
| 7372002 | Fluid heating device and cleaning device using the same | Kazushige Nakamura, Shigeru Shirai, Yasuhiro Umekage, Koji Oka | 2008-05-13 |