Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5567668 | Pressure- and heat-sensitive multilayer copying paper | Kunio Oda, Akihiro Tanaka, Kazuho Fujiwara, Shinichi Matsumoto | 1996-10-22 |
| 4814319 | Heat and pressure sensitive recording material | Shinichi Matsumoto, Akihiro Tanaka | 1989-03-21 |