Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6743372 | Media for water treatment | Torsten Groth, Winfried Joentgen | 2004-06-01 |
| 5726280 | Sulfonic acid group-containing polyaspartic acid derivatives, use thereof and prepartion thereof | Hermann Uhr, Lutz Heuer, Torsten Groth, Winfried Joentgen | 1998-03-10 |
| 5639909 | Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the alkali metal salts thereof | Christoph Holzner, Wolfgang Ohlendorf, Hans-Dieter Block, Horst Bertram, Hans-Heinrich Moretto | 1997-06-17 |
| 5525257 | Composition for water treatment containing polyaspartic acidora derivative thereof and a polcarboxylic acid and methods of using the composition | Hermann Sicius, Torsten Groth, Winfreid Joentgen | 1996-06-11 |
| 5523023 | Water treatment/cleaning composition comprising polyaspartic acid or derivatives thereof and phosphonic acid | Hermann Sicius, Torsten Groth, Winfried Joentgen | 1996-06-04 |
| 5506335 | Sulfonic acid group-containing polyaspartic acid derivatives, use thereof and preparation thereof | Hermann Uhr, Lutz Heuer, Torsten Groth, Winfried Joentgen | 1996-04-09 |
| 5233088 | Process for the preparation of alkali metal salts of 2-phosphonobutane-1,2,4-tricarboxylic acid | Uwe Arndt, Hans-Dieter Block | 1993-08-03 |
| 5091562 | Process for eliminating 1-carboxy-1-phosphonocyclopentan-3-one from, or reducing its content in, technical 2-phosphonobutane-1,2,4-tricarboxylic acid using bleaching liquor | Michael Immenkeppel, Hans-Dieter Block, Hermann Sicius, Peter C. Schmidt | 1992-02-25 |
| 4968431 | Process for treating cooling water | Gerhard Bohnsack | 1990-11-06 |
| 4931586 | Process for the continuous production of 2-phosphone-butane-1,2,4-tricarboxylic acid and alkali metal salts thereof | Cornelia Lensch, Michael Immenkeppel, Hans-Dieter Block, Herbert Odenbach | 1990-06-05 |
| 4623672 | Isocyanate addition products and a process for their production | Rolf Wiedermann | 1986-11-18 |
| 4246103 | Propane-1,3-diphosphonic acids for conditioning water | Hans-Dieter Block, Herbert Kallfass | 1981-01-20 |