Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842988 | Presensitized waterless planographic printing plate with amorphous silicic acid interlayer and process of making and using | Heinz Herrmann | 1989-06-27 |
| 4842990 | Presensitized negative working waterless planographic printing plate with amorphous silicic acid interlayer and process of making and using | Heinz Herrmann, Susanne Billino | 1989-06-27 |