Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877907 | Preparation process of 4,4'-biphenol, precursor of same and preparation process of precursor | Tohru Miura, Koju Okazaki, Masayuki Furuya, Emiko Nishida | 1989-10-31 |
| 4873374 | Preparation process of 4,4'-biphenol, precursor of same and preparation process of precursor | Tohru Miura, Koju Okazaki, Masayuki Furuya, Emiko Nishida | 1989-10-10 |
| 4871875 | Process for producing diphenylamines or N,N'-diphenylphenylenediamines | Akihiro Tamaki, Nobuyuki Kajimoto, Masaru Wada | 1989-10-03 |
| 4851590 | Method of purifying 2,4-xylenol | Tohru Miura, Katsuju Watanabe, Hitoshi Nakayama, Masayuki Furuya | 1989-07-25 |
| 4814488 | 4,4-bis(4-hydroxyphenyl)cyclohexanecarboxylic acid derivatives and process for preparing same | Tohru Miura | 1989-03-21 |
| 4804783 | Process for producing diphenylamines or N,N'-diphenyl-phenylenediamines | Akihiro Tamaki, Nobuyuki Kajimoto, Masaru Wada | 1989-02-14 |