Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4340387 | Process for the dyeing of fibre material | David G. Evans, Willi Leutenegger | 1982-07-20 |
| 4329146 | Process for the dyeing of fibre material | Willi Leutenegger | 1982-05-11 |
| 4313733 | Assistant mixture for the dyeing or fluorescent brightening | Alain Lauton, Jean P. Luttringer | 1982-02-02 |