Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889655 | Mixtures of fluorescent whitening agents | Heinz Hefti, Klaus Artz, Kurt Weber, Kurt Burdeska | 1989-12-26 |
| 4867906 | Mixtures of fluorescent whitening agents | Leonardo Guglielmetti, Hans R. Meyer, Kurt Weber | 1989-09-19 |
| 4847404 | Stilbene derivatives by desulfonation | Kurt Burdeska, Kurt Weber | 1989-07-11 |
| 4830763 | Process for increasing the degree of whiteness of polyester-containing textile material | Heinz Hefti, Urs Lehmann, Jurgen Kaschig | 1989-05-16 |