Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889687 | Nodular cast iron having a high impact strength and process of treating the same | Yasuoki Ishihara, Fumio Obato, Jun Sakai | 1989-12-26 |
| 4889688 | Process of producing nodular cast iron | Makoto Suenaga, Fumio Obata, Jun Sakai | 1989-12-26 |