Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4488879 | Process for dyeing textile materials of polyacrylonitrile: quaternized piperazine copolymer as basic dye retarder | Rolf Fikentscher, Sigismund Heimann, Heinrich Mertens | 1984-12-18 |