Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5670445 | Cleaning agent of harmful gas and cleaning method | Koichi Kitahara, Kenji Otsuka, Hideki Fukuda | 1997-09-23 |
| 5662872 | Process for cleaning harmful gas | Takashi Shimada, Toshio Okumura | 1997-09-02 |
| 5597540 | Process for cleaning harmful gas | Noboru Akita, Takashi Shimada, Keiichi Iwata | 1997-01-28 |