Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6344239 | Method for producing a tobacco filter material | Tanemi Asai, Hiroyuki Matsumura, Tohru Shibata | 2002-02-05 |
| 5977346 | Fatty acid ester of cellulose, cellulose diacetate and processes for the preparation thereof | Shiro Saka, Hiroyuki Matsumura, Naoto Habu, Yoshiaki Kaino, Ryouta Iwata +1 more | 1999-11-02 |
| 5967149 | Tobacco filter material and a method of producing the same | Hitoshi Tsugaya | 1999-10-19 |
| 5927287 | Tobacco filter material and a tobacco filter as produced using the same | Hiroyuki Matsumura, Tohru Shibata | 1999-07-27 |
| 5863652 | Tobacco smoke filter materials, fibrous cellulose esters, and production processes | Hiroyuki Matsumura, Tohru Shibata | 1999-01-26 |
| 5856006 | Tobacco filter material and a method for producing the same | Tanemi Asai, Hiroyuki Matsumura, Tohru Shibata | 1999-01-05 |
| 5711322 | Tobacco filter material and a method of producing the same | Hitoshi Tsugaya | 1998-01-27 |
| 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 |