Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820808 | Copper Complexes of disazo compounds having two substituted 2-hydroxyphenyl diazo component radicals and two 3-methylpyrazol-5-one coupling component radicals | Friedrich Lehr | 1989-04-11 |