Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5244860 | Pressure-sensitive recording and transfer material | Rene Graf, Peter Burri | 1993-09-14 |
| 4299654 | Process for producing sized paper and cardboard with polyelectrolytes and epoxide-amine-polyamide reaction products | Hugo Tlach, Klaus-Dieter Leifels | 1981-11-10 |
| 4200489 | Process for producing sized paper or cardboard with dyes or optical brighteners and epoxide-amine-polyamide reaction products | Hugo Tlach, Klaus-Dieter Leifels | 1980-04-29 |