Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4804417 | Process for producing dioxazine violet pigment | Yoshiaki Hayashi, Hiroshi Okayasu | 1989-02-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4804417 | Process for producing dioxazine violet pigment | Yoshiaki Hayashi, Hiroshi Okayasu | 1989-02-14 |