Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882102 | Process for producing hard carbonaceous sheets | Takamasa Kawakubo, Yoshihisa Suda | 1989-11-21 |
| 4882103 | Process for producing carbon product having coarse and dense structure | Takamasa Kawakubo, Yoshihisa Suda | 1989-11-21 |
| 4855093 | Process of making a diaphragm of carbonaceous materials for a speaker | — | 1989-08-08 |