Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4705763 | High zirconia fused refractory product | Atsushi Hayashi, Kohzo Sakai, Toshihiro Ishino | 1987-11-10 |
| 4336339 | High zirconia fused refractory product | Masataro Okumiya | 1982-06-22 |