Issued Patents 1997
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5684180 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-11-04 |
| 5679840 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-10-21 |
| 5679841 | 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 |
| 5648519 | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Hartmut Knofel | 1997-07-15 |
| 5648520 | Fractionation and purification of aromatic polyamine and the use thereof | Hartmut Knofel | 1997-07-15 |