Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6309438 | Filter unit and dust-proof mask therewith | Kunio Yamada, Hirohisa Umezaki | 2001-10-30 |
| 5167945 | Method for producing graphite fiber | Hiroyasu Ogawa, Tetsuro Shigei | 1992-12-01 |
| 5089360 | High-strength non-woven fabric, method of producing same and battery separator constituted thereby | Yoshihisa Matsushima, Makoto Suzuki | 1992-02-18 |