Issued Patents All Time
Showing 26–50 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5233088 | Process for the preparation of alkali metal salts of 2-phosphonobutane-1,2,4-tricarboxylic acid | Uwe Arndt, Roland Kleinstuck | 1993-08-03 |
| 5216113 | Highly branched polyphosphonates | Wolfgang Schulz-Schlitte, Jurgen Kirsch, Karsten-Josef Idel, Gerd Fengler, Uwe Arndt | 1993-06-01 |
| 5181994 | Process for the preparation of chromic acid | Norbert Lonhoff, Ludwig Schmidt, Rainer Weber | 1993-01-26 |
| 5159074 | Aminomethanephosphonic acid aryl esters, a process for their production and their use | Uwe Arndt, Wolfgang Schulz-Schlitte | 1992-10-27 |
| 5127999 | Process for the preparation of alkali metal dichromates and chromic acid by electrolysis | Helmut Klotz, Rainer Weber, Norbert Lonhoff, Hans-Dieter Pinter | 1992-07-07 |
| 5128000 | Dimensionally stable anodes and their use in the preparation of alkali metal dichromates and chromic acid | Helmut Klotz, Rainer Weber, Norbert Lonhoff | 1992-07-07 |
| 5096548 | Process for the preparation of chromic acid | Norbert Lonhoff, Ludwig Schmidt, Rainer Weber | 1992-03-17 |
| 5094729 | Processes for the preparation of alkali metal dichromates and chromic acid | Helmut Klotz, Hans-Dieter Pinter, Rainer Weber, Norbert Lonhoff | 1992-03-10 |
| 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, Roland Kleinstuck, Hermann Sicius, Peter C. Schmidt | 1992-02-25 |
| 5071522 | Process for the preparation of chromic acid | Helmut Klotz, Hans-Dieter Pinter, Rainer Weber, Norbert Lonhoff | 1991-12-10 |
| 5068015 | Electrochemical process for the production of chromic acid | Norbert Lonhoff, Bernd Makowka, Helmut Klotz, Rainer Weber, Bernhard Spreckelmeyer | 1991-11-26 |
| 5051155 | Processes for the preparation of alkali metal dichromates and chromic acid | Helmut Klotz, Hans-Dieter Pinter, Rainer Weber, Norbert Lonhoff | 1991-09-24 |
| 4988748 | Flame-resistant thermoplastic polycarbonate molding compounds | Karl Fuhr, Friedemann Muller, Karl-Heinz Ott, Bernd Urbanneck, Werner Ballas | 1991-01-29 |
| 4981573 | Process for the production of alkali dichromates and chromic acid employing an anode of valve metal activated by electrodepositing noble metals from melts | Helmut Klotz, Rainer Weber, Norbert Lonhoff | 1991-01-01 |
| 4931586 | Process for the continuous production of 2-phosphone-butane-1,2,4-tricarboxylic acid and alkali metal salts thereof | Roland Kleinstuck, Cornelia Lensch, Michael Immenkeppel, Herbert Odenbach | 1990-06-05 |
| 4827022 | Process for the preparation of dimethylmaleate | Bernd Makowka | 1989-05-02 |
| 4491656 | Polyphosphates and process of preparation | Volker Serini, Bernhard Schulte, Dieter Freitag | 1985-01-01 |
| 4482693 | Polyphosphates and the production thereof | Volker Serini, Paul J. Mayska, Dieter Freitag | 1984-11-13 |
| 4415719 | Thermoplastic, branched aromatic polyphosphonates, and a process for their production | Manfred Schmidt, Ludwig Bottenbruch, Dieter Freitag, Klaus Reinking, Harry Rohr | 1983-11-15 |
| 4391761 | Process for the production of aryl phosphonyl compounds | Hans Dahmen | 1983-07-05 |
| 4377537 | Preparation of alkane phosphonic and phosphinic acid aryl esters | Hans G. Frohlen | 1983-03-22 |
| 4344855 | Process for the production of polyisocyanates which contain carbodiimide groups and which are stable in storage | Walter Schafer, Kuno Wagner | 1982-08-17 |
| 4331614 | Aromatic polyphosphonates and a process for their production | Manfred Schmidt, Ludwig Bottenbruch, Dieter Freitag, Klaus Reinking, Harry Rohr | 1982-05-25 |
| 4307040 | Process for producing phosphonomaleic acid esters | Friedrich Schwochow, Reinhard Schliebs | 1981-12-22 |
| 4294719 | Polyisocyanates which contain carbodiimide groups and which are stable in storage | Kuno Wagner, Walter Schafer | 1981-10-13 |