Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4700723 | Tobacco filter and fibrous ion exchange resin | Toshio Yoshioka, Masaharu Shimamura | 1987-10-20 |
| 4693828 | Method of ion-exchanging and/or adsorption | Toshio Yoshioka, Masaharu Shimamura | 1987-09-15 |