Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4357447 | Polymere N-halogenamide auf basis von acryl-und methacrylamid | Hans Zengel, Manfred Bergfeld | 1982-11-02 |
| 4356289 | Polymeric N-halogenoamides on the basis of acrylamide and methacrylamide | Hans Zengel, Manfred Bergfeld | 1982-10-26 |
| 4346233 | Process for the preparation of ureas | Hans Zengel, Manfred Bergfeld | 1982-08-24 |
| 4301257 | Polyfunctional isocyanates free of alkali and urea groups | Hans Zengel, Manfred Bergfeld | 1981-11-17 |
| 4296260 | Process for the preparation of phloroglucinol | Helmut Maegerlein | 1981-10-20 |
| 4238404 | Process for the preparation of isocyanate derivatives of aliphatic, cycloaliphatic, and araliphatic compounds | Hans Zengel, Manfred Bergfeld, Erich Klimesch | 1980-12-09 |