Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4750935 | Printing ink | Helmut P. Prochaska, Klaus Kunde, Artur Haus, Knud Reuter | 1988-06-14 |
| 4576649 | Color enhanced permanent pigments from precipitated cationic dyes | Vincent S. Oliver, Helmuth H. Prochaska, Karl-Heinz Wieser | 1986-03-18 |