Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880724 | Method for manufacture of lithographic printing plate with disposable developer with surfactant | Hisao Ohba, Kenji Kunichika | 1989-11-14 |
| 4837131 | Developing method for photosensitive material | Kesanao Kobayashi, Hisao Ohba | 1989-06-06 |