Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8092655 | Dividing wall column for fractionation of a multicomponent mixture | Horst Hartmann, Gerd Kaibel, Guido Harms | 2012-01-10 |
| 6617463 | Method for the production of L-ascorbic acid by lactonization of 2-keto-L-gulonic acid or s2-keto-L-gulonate esters | Andreas Böttcher | 2003-09-09 |
| 6573400 | Preparation of 2-keto-L-gulonic esters | Andreas Böttcher | 2003-06-03 |
| 6554965 | Rectification column for isolating pure substances from high boiling air-and/or temperature sensitive substances | Horst Hartmann, Wulf Kaiser, Harald Laas, Paul Grafen, Bernhard Bockstiegel +1 more | 2003-04-29 |
| 6461482 | Process for preparing high-purity phytantriol | Harald Streicher, Jürgen Däuwel, Jürgen Koppenhöfer | 2002-10-08 |
| 6274744 | Preparation of alkali metal salts of L-ascorbic acid | Gerd Kaibel, Andreas Böttcher, Veronique Kessler, Thomas Kuntze | 2001-08-14 |
| 6111117 | Process for isolation of pure substances from mixtures of high-boiling air and/or temperature-sensitive substances which require a high separation efficiency by rectification under medium vacuum, and columns suitable for this process | Horst Hartmann, Wulf Kaiser, Harald Laas, Paul Grafen, Bernhard Bockstiegel +1 more | 2000-08-29 |
| 5994589 | Process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one | Detlef Ruff, Wulf Kaiser, Manfred Stroezel | 1999-11-30 |
| 5950454 | Cloth or cloth-like packing which is subject to low pressure losses and has an ordered structure for use in material-exchange columns and rectification method using such packing | Horst Hartmann, Wulf Kaiser, Harald Laas, Paul Grafen, Bernhard Bockstiegel +1 more | 1999-09-14 |
| 5773635 | Preparation of polyenecarbonyl compounds having a high content of the all-E isomer, and of their acetals or ketals | Walter Dobler, Wolfgang Krause, Joachim Paust, Otto Worz, Udo Rheude +8 more | 1998-06-30 |
| 4661610 | Preparation of veratryl cyanide | Josef Muller, Walter-Wielant Wiersdorff, Heinz Dralle, Ernst Schaffner, Rolf Steinkamp | 1987-04-28 |