Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6862987 | Porous resin stamp | Yasuo Nagasawa, Yuji Tanaka, Yoshitomo Tanaka | 2005-03-08 |
| 6645418 | Method of producing a porous resin stamp | Yasuo Nagasawa, Yuji Tanaka, Yoshitomo Tanaka | 2003-11-11 |