Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5675002 | Purification of hydrophobic solids | — | 1997-10-07 |
| 4977278 | Preparation of rhodamine dyes in granule form by direct cooling | — | 1990-12-11 |
| 4952680 | Preparation of stable solutions of azo dyes of m-phenylenediamine by reaction with formic acid | — | 1990-08-28 |
| 4923972 | Preparation of liquid formulations of basic azo dyes in carboxylic acid solution and subsequent heating | — | 1990-05-08 |
| 4895961 | Preparation of esterified rhodamine dyes | — | 1990-01-23 |
| 4789739 | Preparation of polyhalocopper phthalocyanine pigments of high color strength | Joachim Kranz | 1988-12-06 |