Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4760153 | Process for producing maleic anhydride | Youjirou Takahashi, Junichi Toyoda, Toshimasa Kushihara, Ikuo Kurimoto, Shigemi Osaka | 1988-07-26 |
| 4665200 | Method for preparing pyromellitic acid and/or pyromellitic anhydride | Yoji Akazawa, Ikuo Kurimoto, Youjirou Takahashi, Shinichi Uchida, Hisashi Yoshikawa | 1987-05-12 |
| 4481304 | Catalyst for producing phthalic anhydride | Takahisa Sato, Keizo Maruyama, Takehiko Suzuki | 1984-11-06 |
| 4356112 | Catalyst for production of phthalic anhydride | Yoji Akazawa, Noriaki Ikeda, Takehiko Suzuki | 1982-10-26 |
| 4284571 | Process for producing phthalic anhydride and catalyst therefor | Takahisa Sato, Keizo Maruyama, Takehiko Suzuki | 1981-08-18 |