Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5196578 | Purification process of methacrylic acid | Takeshi Isobe, Nobutaka Ueda, Minoru Koshibe, Yoshihiro Sezaki, Hirozo Segawa +2 more | 1993-03-23 |
| 5028735 | Purification and preparation processes for methyl methacrylate | Hirozo Segawa, Norio Ishikawa, Katsuji Yoguchi, Minoru Koshibe | 1991-07-02 |
| 4987252 | Quenching process of reaction product gas containing methacrylic acid and treatment method of quenched liquid | Kozo Iwasaki, Takeshi Isobe, Isao Fukada, Minoru Koshibe, Yoshihiro Sezaki +2 more | 1991-01-22 |
| 4968846 | Method for the prevention of post oxidation of methacrolein | Kozo Iwasaki, Yoshio Koyama, Takeshi Isobe, Hirozo Segawa, Katsuji Yoguchi | 1990-11-06 |
| 4879412 | Purification process of methacrylic acid | Kozo Iwasaki, Minoru Koshibe, Yoshihiro Sezaki, Katsuji Yoguchi, Yoshio Koyama | 1989-11-07 |