Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE32792 | Process for producing mesophase pitch | Takayuki Izumi, Tsutomu Naito | 1988-11-29 |
| 4533461 | Process for producing mesophase pitch | Takayuki Izumi, Tsutomu Naito | 1985-08-06 |