Issued Patents All Time
Showing 25 most recent of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5554774 | Preparation of chlorinated violanthrones or isoviolanthrones | Gerhard Sch afer, Heinrich Kowarsch | 1996-09-10 |
| 5536842 | Purification of indigo | Manfred Gang, Reinhold Kohlhaupt | 1996-07-16 |
| 5534627 | Polycyclic vat dyes | Harald Schlueter, Michael Schmitt | 1996-07-09 |
| 5525743 | Preparation of anthraquinone imide compounds | Helmut Hoch, Heike Kilburg, Reinhold Kohlhaupt, Matthias Niedenbrueck | 1996-06-11 |
| 5424453 | Purification of indigo | Reinhold Kohlhaupt | 1995-06-13 |
| 5386042 | Preparation of 1,4-diaminoanthraquinone-2,3-disulfonic acid and 1,4-diaminoanthraquinone-2,3-dinitrile | Matthias Dust, Gerd Schwantje | 1995-01-31 |
| 5380871 | Preparation of halogenated indigo | Reinhold Kohlhaupt, Lothar Haas | 1995-01-10 |
| 5245058 | Preparation of 1-nitroanthraquinone-2-carboxylic acids | Helmut Hagen, Jacques Dupuis, Michael Acker | 1993-09-14 |
| 5003049 | Dyes containing fluorotriazine and dichloropyridazone groups | Alfred Hackenberger, Manfred Patsch | 1991-03-26 |
| 4960874 | Isothiazolylazo dyes having aminophenyl and aminonaphthyl components | Johannes D. Dix, Guenter Hansen, Ernst Schefczik, Guenther Seybold | 1990-10-02 |
| 4820809 | Heterocyclic azo dyes | Erwin Hahn, Guenter Hansen | 1989-04-11 |
| 4764600 | Isothiazolylazo dyes having aminophenyl and aminonaphthyl components | Johannes P. Dix, Guenter Hansen, Ernst Schefczik, Guenther Seybold | 1988-08-16 |
| 4751288 | Azo dyes containing 2-amino-3-cyano-5-formylthiophene derivatives as diazo components and substituted aniline compounds as coupling components | Erwin Hahn, Guenter Hansen, Helmut Reichelt | 1988-06-14 |
| 4668775 | .alpha.-methine substituted thiophene monoazo dye | Erwin Hahn, Guenter Hansen | 1987-05-26 |
| 4638055 | Iron, copper and chromium complexes of disazo dyes | Guenter Hansen, Georg Zeidler | 1987-01-20 |
| 4619992 | 3-(.beta.-aminoethyl)-4-cyano-isothiazolylazo dyes | Johannes P. Dix, Guenter Hansen, Ernst Schefczik | 1986-10-28 |
| 4563520 | Metal complexes of dis- or trisazo compounds containing a middle component twice substituted by hydroxy and/or amino | Guenter Hansen, Dietrich Lach, Georg Zeidler | 1986-01-07 |
| 4547566 | Copper, cobalt, nickel and iron complexes of disazo dyes | Guenter Hansen, Georg Zeidler | 1985-10-15 |
| 4537597 | Navy blue mixtures of disperse mono-azo dyes for cellulose acetate | Helmut Degen, Guenter Hansen, Reinhold Krallmann, Hans Weber | 1985-08-27 |
| 4496480 | Isothiazolazo dyes having coupling components which are free from unsaturated aliphatic radicals | Johannes P. Dix, Guenter Hansen, Ernst Schefczik | 1985-01-29 |
| 4491543 | Dis-, tris-, and tetrakisazo compounds containing resorcinol, sulfonylamino, and two or three sulfonic acid groups | Guenter Hansen, Dietrich Lach, Michael Thomas, Georg Zeidler | 1985-01-01 |
| 4486198 | Navy dye mixtures | Ernst Becker, Helmut Degen, Guenter Hansen, Reinhold Krallmann | 1984-12-04 |
| 4414552 | Printing head for ink jet printers | Heinrich Kurz, Wolfgang Radtke | 1983-11-08 |
| 4405330 | Navy disperse dye mixtures | Helmut Degen, Guenter Hansen, Reinhold Krallmann, Wolf-Dieter Kermer | 1983-09-20 |
| 4389216 | Navy dye mixtures | Helmut Degen, Guenter Hansen, Reinhold Krallmann, Wolf-Dieter Kermer | 1983-06-21 |