Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857501 | Manufacturing method of a heat sensitive recording material | Toshimasa Usami, Sumitaka Tatsuta, Seiji Hatakeyama | 1989-08-15 |
| 4845071 | Heatsensitive recording material | Toshimasa Usami, Seiji Hatakeyama | 1989-07-04 |
| 4840933 | Heat sensitive recording material | Toshimasa Usami, Seiji Hatakeyama | 1989-06-20 |
| 4826807 | Heat-sensitive recording material | Kenji Ikeda | 1989-05-02 |
| 4820682 | Heat sensitive recording materials | Toshimasa Usami | 1989-04-11 |
| 4797384 | Heat-sensitive recording sheet | Akira Igarashi, Shinichiro Serizawa | 1989-01-10 |