Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6978035 | Information hiding system, method, and printed matter into which information is hidden | Eiji Kawaguchi, Richard Eason | 2005-12-20 |
| 6742712 | Information card and information card system | Eiji Kawaguchi, Richard Eason | 2004-06-01 |