Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867906 | Mixtures of fluorescent whitening agents | Leonardo Guglielmetti, Dieter Reinehr, Kurt Weber | 1989-09-19 |
| 4816590 | Pyrazoline compounds and method of whitening | — | 1989-03-28 |