Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4904767 | Asymmetric 1:2-chrome complexes of benzene-azo-naphthalene/naphthalene-azo-naphthalene acid dyes for leather | Alois Puntener, Peter Loew | 1990-02-27 |
| 4874848 | Asymmetrical polyazo chromium complex dyes comprising resorcinol as a coupling component | Gerhard Back | 1989-10-17 |
| 4799933 | Process for the trichromatic dyeing of leather | Josef Koller | 1989-01-24 |
| 4710198 | 1:2 chromium or cobalt metal complex dyes and use thereof for dyeing leather | Hans U. Schutz | 1987-12-01 |
| 4661587 | Bis 1:2 chromium complexes of disazo and azo or azomethine dyes | Ulrich Schlesinger | 1987-04-28 |
| 4652631 | Bis 1:2 chromium complexes of disazo and azo or azomethine dyes | Ulrich Schlesinger | 1987-03-24 |
| 4650859 | Chrome azo and/or azomethine dyes containing a benzthiazolylphenyl or stilbenyl radical | — | 1987-03-17 |
| 4617382 | 8-hydroxyquinoline sulfonic acid-azo chromium complexes | Gerhard Back, Arthur Buhler | 1986-10-14 |
| 4563193 | Asymmetric 1:2 chrome complex dyes containing an azo and an azomethine compound | — | 1986-01-07 |
| 4507124 | 1:2 Metal complexes of azomethine dyes having arylazo groups | Alois Puntener | 1985-03-26 |
| 4502865 | Fibre-reactive chromium complex dyes, process for their manufacture and use thereof to dye cellulose or wool | Gerhard Back, Hans-Ulrich Sch/u/ tz | 1985-03-05 |
| 4493798 | Metal complexes of disazo dyes | — | 1985-01-15 |
| 4452602 | Process for dyeing leather with mixtures of dyes | Alois Puntener, Josef Koller | 1984-06-05 |
| 4432898 | Sulfo-substituted fibre-reactive 1:2-chromium complex azo dyes | Gerhard Back, Hans U. Schutz | 1984-02-21 |
| 4427585 | 1:2 Chromium and cobalt complex dyes | — | 1984-01-24 |
| 4378970 | Red monoazo sulphonic acid dyestuffs for polyamide | Paul Lienhard | 1983-04-05 |
| 4364864 | 1:2 Cobalt and chromium complex unsymmetrical azo dyes | Gerhard Back, Hans U. Schutz | 1982-12-21 |
| 4340536 | Chrome-complex dyes and the production and use thereof | — | 1982-07-20 |
| 4331596 | Arylazoarylazo-substituted azo, azomethine 1:2 chromium complex dyes | Gerhard Back | 1982-05-25 |
| 4315854 | Chromium and cobalt complex amino hydroxy azomethine dyes | Alois Puntener | 1982-02-16 |
| 4314937 | 1:2 Chromium unsymmetrical complexes of azo and disazo dyes | — | 1982-02-09 |
| 4312808 | Red monoazo dyestuffs | Paul Lienhard | 1982-01-26 |
| 4311641 | Chromium complexes of mixed azo compounds | — | 1982-01-19 |
| 4256633 | Chromium complex compounds, process for their manufacture and use thereof | — | 1981-03-17 |
| 4219473 | Substituted unsymmetrical azo, azomethine 1:2 chromium complexes | Eginhard Steiner | 1980-08-26 |