Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4810678 | Gas pressure sintering of silicon nitride with addition of rare earth oxides | Akira Okada | 1989-03-07 |
NH
Naoto Hirosaki
Overall (1989): #74,118 of 140,708Top 55%
1
Patents 1989