Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691047 | Porous multi-layer film | Tetuo Akazawa, Akira Kawabata | 1997-11-25 |
| 5258156 | Process for producing microporous film having breakage resistance when melted | Tetsuo Akazawa | 1993-11-02 |