Issued Patents All Time
Showing 1–24 of 24 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7790804 | Process for stripping polymer polyols | Ludwig Deibele, Manfred Dietrich, Markus Hadley, Jan Thomas Leu, Guido Naberfeld +1 more | 2010-09-07 |
| 7141613 | Flame resistant rigid foams and formulations for the production thereof | Rolf Albach, Juan Cirujeda-Ranzenberger | 2006-11-28 |
| 6472447 | Stabilized, finely disperse low-viscosity polymer polyols with a high content of polystyrene or polystyrene copolymers | Klaus Lorenz, Manfred Dietrich, Uwe Scholz, Robert J. Kumpf, Jurgen Gronen +1 more | 2002-10-29 |
| 5684180 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-11-04 |
| 5679841 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-10-21 |
| 5679840 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-10-21 |
| 5675035 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-10-07 |
| 5672737 | Fractionation and purification of mixtures of aromatic polyamines and use thereof | Hartmut Knofel | 1997-09-30 |
| 5663424 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-09-02 |
| 5648520 | Fractionation and purification of aromatic polyamine and the use thereof | Hartmut Knofel | 1997-07-15 |
| 5648519 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-07-15 |
| 5359141 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Marcel Petinaux, Rudolf Uchdorf, Hans-Peter Schal | 1994-10-25 |
| 5196591 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Marcel Petinaux, Rudolf Uchdorf, Hans-Peter Schal | 1993-03-23 |
| 4924028 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Marcel Petinaux, Rudolf Uchdorf | 1990-05-08 |
| 4914236 | Process for the preparation of multinuclear aromatic polyamines | Hartmut Knofel, Marcel Petinaux, Rudolf Uchdorf | 1990-04-03 |
| 4879408 | Cycloaliphatic diisocyanates optionally in the form of isomer mixtures and a process for their production | Hartmut Knofel, Stefan Penninger, Herbert Stutz | 1989-11-07 |
| 4879409 | Cycloaliphatic diisocyanates, optionally in the form of isomeric mixtures and a process for their preparation | Hartmut Knofel, Stefan Penninger, Herbert Stutz | 1989-11-07 |
| 4786751 | Dissocyanates, diisocyanate mixtures and a process for their production | Hartmut Knofel, Stefan Penninger, Herbert Stutz | 1988-11-22 |
| 4761498 | Diisocyanates and diisocyanate mixtures based on diphenylmethane, processes for their production and their use as isocyanate component in the production of polyurethane plastics by the isocyanate polyaddition process | Hartmut Knofel, Gerhard Wegener | 1988-08-02 |
| 4720582 | Diamines and a process for their production | Hartmut Knofel, Stefan Penninger | 1988-01-19 |
| 4675437 | Cycloaliphatic triisocyanates | Hartmut Knofel, Stefan Penninger, Gunter Hammen, Herbert Stutz | 1987-06-23 |
| 4613687 | Polyisocyanates of the diphenyl methane series | Hartmut Knofel | 1986-09-23 |
| 4603189 | Triisocyanates and a process for their preparation | Hartmut Knofel, Stefan Penninger, Gunter Hammen, Herbert Stutz | 1986-07-29 |
| 4587058 | Diisocyanates of the diphenyl methane series and processes for the production thereof | Hartmut Knofel | 1986-05-06 |