Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4774357 | Process for purifying polyisocyanates and the polyisocyanates thus purified | Berthold Keggenhoff, Franz-Moritz Richter, Marcel Petinaux | 1988-09-27 |
| 4745216 | Process for the production of polyisocyanates | Berthold Keggenhoff, Marcel Petinaux, Alfred Mitschker, Peter M. Lange | 1988-05-17 |
| 4597909 | Process for the production of polyisocyanates | Berthold Keggenhoff, Enno Mahlmann, Willi Eifler | 1986-07-01 |
| 4414074 | Process for the purification of 4,4'-diisocyanatodiphenylmethane by plural distillations | Gunter Gleitsmann, Max Scheidel | 1983-11-08 |
| 4405527 | Process for the preparation of polyisocyanates | Gerhard Wegener, Hartmut Knofel, Marcel Petinaux | 1983-09-20 |
| 4271121 | Plaque for measuring the dose of reactive gases | Werner Diller, Eckard Drope, Ernst Reichold | 1981-06-02 |
| 4189354 | Process for the production of diisocyanatodiphenyl methane isomers with an adjusted content of chlorine compounds | Hermann Fischer, Peter Fischer | 1980-02-19 |