Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857291 | Process of producing plate-shaped calcium carbonate particles | Yoshio Ota, Norifumi Goto, Iwao Motoyama, Tetsushi Iwashita | 1989-08-15 |
| 4824654 | Process of producing needle-shaped calcium carbonate particles | Yoshio Ota, Norifumi Goto, Iwao Motoyama, Tetsushi Iwashita | 1989-04-25 |