Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6720067 | Polypropylene base porous film and production process for the same | Yoshinori Takahashi | 2004-04-13 |
| 6472445 | Polypropylene base porous film and production process for the same | Yoshinori Takahashi | 2002-10-29 |