Issued Patents 2003
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6668548 | Exhaust emission control device of internal combustion engine | Takamitsu Asanuma, Shinya Hirota, Toshiaki Tanaka | 2003-12-30 |
| 6655133 | Exhaust gas purifier for internal combustion engine | Akira Mikami, Shinya Hirota, Kazuhiro Itoh, Takamitsu Asanuma, Koichi Kimura +4 more | 2003-12-02 |
| 6634167 | Exhaust temperature raising apparatus and method for internal combustion engine | Shinya Hirota, Takamitsu Asanuma, Toshiaki Tanaka | 2003-10-21 |
| 6502391 | Exhaust emission control device of internal combustion engine | Shinya Hirota, Toshiaki Tanaka | 2003-01-07 |