Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6731111 | Validity determination using magnetic ink having magnetic powders with different Curie temperatures | Takao Sawa, Katsutoshi Nakagawa, Teruo Murakami, Tadahiko Kobayashi, Hisashi Takahashi | 2004-05-04 |