Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881963 | Granuler fertilizer with a degradative coating | Yoshisato Yamashita, Shigemitsu Yoshida, Katsutoshi Yamahira | 1989-11-21 |
| 4844755 | High-strength heat-resisting ferritic steel pipe and tube | Katukuni Hashimoto, Yasuo Otoguro | 1989-07-04 |