Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4502067 | Heat-sensitive black recording material | Haruo Koyama, Nobuhiro Miyakawa | 1985-02-26 |
| 4500897 | Heat-sensitive black recording element | Haruo Koyama, Nobuhiro Miyakawa | 1985-02-19 |