Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861656 | Optical recording medium | Hideki Ishizaki, Suguru Takayama | 1989-08-29 |
| 4849304 | Optical recording medium | Hideki Ishizaki, Hajime Utsunomiya, Suguru Takayama | 1989-07-18 |
| 4833057 | Toner composition for the electrophotography | Akira Misawa, Hisatomo Sato, Keiichi Ishikawa, Masaaki Shin, Akio Fujiwara +2 more | 1989-05-23 |