Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871875 | Process for producing diphenylamines or N,N'-diphenylphenylenediamines | Teruyuki Nagata, Akihiro Tamaki, Masaru Wada | 1989-10-03 |
| 4804783 | Process for producing diphenylamines or N,N'-diphenyl-phenylenediamines | Teruyuki Nagata, Akihiro Tamaki, Masaru Wada | 1989-02-14 |