Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871697 | Method of producing homogeneous silicon nitride sintered bodies | Issei Hayakawa | 1989-10-03 |
| 4820665 | Ceramic sintered bodies and a process for manufacturing the same | Issei Hayakawa, Mithuru Miyamoto, Tadaaki Matsuhisa | 1989-04-11 |