Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881474 | Pulverized coal combustion apparatus | Osamu Okada, Shigeki Morita, Shigeto Nakashita, Tadahisa Masai, Shigeru Tominaga | 1989-11-21 |
| 4820666 | Zirconia base ceramics | Masanori Hirano | 1989-04-11 |