Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4312923 | Super hard-highly pure silicon nitrides, and a process and apparatus for producing the same | Toshio Hirai | 1982-01-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4312923 | Super hard-highly pure silicon nitrides, and a process and apparatus for producing the same | Toshio Hirai | 1982-01-26 |