Issued Patents All Time
Showing 25 most recent of 148 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6201160 | Preparation of alcohols | Martin Brudermuller, Matthias Irgang, Martin Schmidt-Radde, Tom Witzel, Detlef Kratz +5 more | 2001-03-13 |
| 5728317 | Polyisocyanate compositions having a long shelf life and obtainable by phosgene-free methods, their preparation and their use | Gerhard Laqua, Tom Witzel, Ursula Siebenhaar, David Agar | 1998-03-17 |
| 5689010 | Preparation of higher aldehydes | Rocco Paciello, Michael Roper, Heinz-Josef Kneuper | 1997-11-18 |
| 5616784 | Thermal cleavage of carbamic esters | Hans Volkmar Schwarz, Andreas Otterbach, Otto Mattner, Wolfgang Schwarz, Eckhardt Brandt +2 more | 1997-04-01 |
| 5576449 | Preparation of 2-substituted but-2-ene-1,4-dial-4-acetals and novel hemiacetals of glyoxal monoacetals | J urgen Frank, Johann-Peter Melder, Tom Witzel | 1996-11-19 |
| 5565583 | Preparation of 2-substituted but-2-ene-1, 4-dial-4-acetals and novel hemiacetals of glyoxal monoacetals | J urgen Frank, Johann-Peter Melder, Tom Witzel | 1996-10-15 |
| 5554787 | 2,2-dialkylpentane 1,5-diisocyanates, 2,2-dialkylpentane 1,5-diurethanes and 2,2-dialkylpentane 1,5-dicarbamoyl chlorides, and their preparation and use | Andreas Otterbach, Tom Witzel, Hans Renz | 1996-09-10 |
| 5536854 | Preparation of 2-methyl-1,4-butanediol and 3-methyltetrahydrofuran | Hans-Juergen Weyer, Rolf Fischer, Juergen Frank, Jochem Henkelmann, Hardo Siegel +1 more | 1996-07-16 |
| 5516928 | Preparaion of 3.cyano-3,5,5-trimethylcyclohexanone | Klaus Mundinger, Gerhard Laqua, Tom Witzel | 1996-05-14 |
| 5489663 | Preparation of polyisocyanates containing isocyanurate groups and use thereof | Peter Brandt, Bernd Bruchmann, Gerhard Laqua, Andreas Otterbach, Konrad Stiefenhöfer +3 more | 1996-02-06 |
| 5434291 | Preparation of aminopropionitriles | Tom Witzel, Rudolf Kummer, Guido Voit, Martin Brudermueller, Claus-Ulrich Priester +1 more | 1995-07-18 |
| 5416240 | Preparation of poloxy-alkylene glycols | Hans-Juergen Weyer, Rolf Fischer, Gerhard Jeschek, Herbert Mueller | 1995-05-16 |
| 5399705 | 1,1'-bis(3-aminopropyl)-2,2'-diimidazole | Klaus Ebel, Martin Brudermueller | 1995-03-21 |
| 5386053 | Multistep, continuous preparation of organic polyisocyanates | Andreas Otterbach, Hans Volkmar Schwarz, Wolfgang Schwarz, Eckhardt Brandt, Peter Magnussen +1 more | 1995-01-31 |
| 5380919 | Preparation of neopentyl glycol hydroxypivalate | Martin Schmidt-Radde | 1995-01-10 |
| 5380918 | Preparation of 4-acetoxystyrene | Martin Brudermueller | 1995-01-10 |
| 5371292 | Preparation of 3-aminomethyl-3,5,5-trimethyl-cyclohexylamine | Claus-Ulrich Priester, Tom Witzel, Gerhard Koppenhoefer, Wolfgang Harder | 1994-12-06 |
| 5347033 | Preparation of 5-cyanovaleramide | Tom Witzel, Eberhard Fuchs | 1994-09-13 |
| 5344983 | Selective preparation of linear pentane-1,5-diamines in increased yields | Tom Witzel, Eberhard Fuchs, Claus-Ulrich Priester | 1994-09-06 |
| 5334745 | Preparation of 3-aminopropionitriles | Martin Brudermueller, Tom Witzel | 1994-08-02 |
| 5304685 | Preparation of 3-(hydroxyphenyl)propionaldehydes and their hydrogenation to 3-(hydroxyphenyl)propanols | Martin Schmidt-Radde | 1994-04-19 |
| 5300678 | Preparation of (107 -substituted urethano alkylcarboxylates) | Martin Brudermueller | 1994-04-05 |
| 5268499 | Preparation of mixtures of 3-aminopropionitrile and ethylene cyanohydrin | Martin Brudermueller, Wolfgang Harder, Juergen Hartig, Dieter Franz | 1993-12-07 |
| 5256813 | 3-substituted 2-hydroxy-3-formylpropionic esters, the preparation thereof and the use thereof for preparing 3-substituted 3-formylacrylic esters | Juergen Frank | 1993-10-26 |
| 5254752 | Preparation of 4-halobenzyl alcohols | Martin Brudermueller, Martin Schmidt-Radde | 1993-10-19 |