Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820401 | Process for the preparation of mesophase pitches | Masatoshi Tsuchitani, Sakae Naito | 1989-04-11 |
| 4818449 | Process to prevent crack formation in the production of carbon fibers | Yasuhiro Yamada, Takeshi Imamura, Hidemasa Honda, Masatoshi Tsuchitani | 1989-04-04 |