Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879412 | Purification process of methacrylic acid | Kozo Iwasaki, Morimasa Kuragano, Minoru Koshibe, Yoshihiro Sezaki, Katsuji Yoguchi | 1989-11-07 |
| 4801090 | Discharge pipe and discharge apparatus using the same | Yoshiyuki Yoshida, Kazutaka Onozuka, Yoshihiko Ohashi, Toshihide Tsuji, Kensuke Miyazaki | 1989-01-31 |