Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5692527 | Tobacco smoke filter materials, fibrous cellulose esters, and production processes | Syu Shimamoto, Tohru Shibata | 1997-12-02 |
| 5690126 | Tobacco filter materials and tobacco filter as produced by using the same | Tohru Shibata | 1997-11-25 |
| 5678577 | Tobacco filter material and a tobacco filter as produced using the same | Syu Shimamoto, Tohru Shibata | 1997-10-21 |