Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5380887 | Diphenylsulfone derivatives and heat sensitive recording materials | Takafumi Tohyama, Takehiro Sato, Kousaku Morita, Nobuyuki Hirai | 1995-01-10 |
| 5340788 | Diphenylsulfone derivatives and heat sensitive recording materials | Takafumi Tohyama, Takehiro Sato, Kousaku Morita, Nobuyuki Hirai | 1994-08-23 |