Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4808395 | High-quality coloring carbon black and process for its production | Makoto Ishizu, Hiromu Kobayashi, Hozo Yamazaki | 1989-02-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4808395 | High-quality coloring carbon black and process for its production | Makoto Ishizu, Hiromu Kobayashi, Hozo Yamazaki | 1989-02-28 |