Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5692527 | Tobacco smoke filter materials, fibrous cellulose esters, and production processes | Hiroyuki Matsumura, Tohru Shibata | 1997-12-02 |
| 5678577 | Tobacco filter material and a tobacco filter as produced using the same | Hiroyuki Matsumura, Tohru Shibata | 1997-10-21 |