Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7767855 | Method for the continuous production of an amine | Frank Haese, Joachim Wulff-Doering, Peter C. Gaa, Frank-Friedrich Pape, Johann-Peter Melder +1 more | 2010-08-03 |
| 5543515 | Preparation of tertiary amine oxides | Hardo Siegel, Guenther Seybold | 1996-08-06 |
| 5476969 | Highly reactive polyoxyalkylene-polyols containing tertiary amino groups in bonded form, their preparation, and their use for the preparation of polyisocyanate polyaddition products | Werner Hinz, Stefan Adams, Christian Maletzko, Klaus Vorspohl, Ruth Zschiesche | 1995-12-19 |
| 5359082 | Preparation of 4-substituted imidazoles from N-formyl-.alpha.-aminonitrile | Thomas-Michael Kahl, Horst Neuhauser, Hardo Siegel, Michael Kroener | 1994-10-25 |
| 5260484 | Polytetrahydrofuran derivatives having terminal aromatic groups | Eckhard Hickmann, Hardo Stegel | 1993-11-09 |
| 5254738 | Preparation of 1,4-alkylenediamines | Hardo Siegel, Matthias Irgang | 1993-10-19 |
| 5239120 | Preparation of 2-(3-aminopropyl)-cycloalkylamines | Franz Merger, Claus-Ulrich Priester, Gerhard Koppenhoefer, Wolfgang Harder, Tom Witzel +1 more | 1993-08-24 |
| 5231231 | Process for preparing a poly(1,4-butanediol-.omega.,.omega.'-bismercaptan) | Hardo Siegel, Eckhard Hickmann | 1993-07-27 |
| 5136051 | Preparation of 2-pyrrolidinones | Ludwig Schuster | 1992-08-04 |
| 5132427 | Process for the preparation of amines | Hardo Siegel, Peter Jaeger, Matthias Irgang | 1992-07-21 |
| 5130454 | Polytetrahydrofuran derivatives having terminal aromatic groups | Eckhard Hickmann, Hardo Siegel | 1992-07-14 |
| 5101045 | Preparation of N-substituted pyrrolidones | Hardo Siegel | 1992-03-31 |
| 5101044 | Preparation of N-substituted pyrrolidin-2-ones | Ludwig Schuster | 1992-03-31 |