Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5352334 | The use of metal-free sulfo group free basic disazo compounds containing two identical 6-hydroxypyrid-2-one coupling component radicals for producing colored paper | Roland Wald | 1994-10-04 |