Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6731111 | Validity determination using magnetic ink having magnetic powders with different Curie temperatures | Katsutoshi Nakagawa, Teruo Murakami, Tadahiko Kobayashi, Hisashi Takahashi, Masao Obama | 2004-05-04 |
| 6676772 | Magnetic material | Akiko Saito, Tadahiko Kobayashi, Masashi Sahashi | 2004-01-13 |