Issued Patents 1989
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889704 | Preparation of hydroxylammonium salts | Josef Ritz, Erwin Thomas, Franz-Josef Weiss | 1989-12-26 |
| 4882430 | Recovery of caprolactam from caprolactam distillation low boilers or high boilers or mixtures thereof | Gerald Neubauer, Emile De Decker, Bernhard Holzknecht, Josef Ritz | 1989-11-21 |
| 4873369 | Purification of cyclohexanone oxime containing ammonium sulfate | — | 1989-10-10 |
| RE33073 | Obtaining caprolactam by cleaving oligomers of caprolactam | Uwe Brand, Helmut Buchaeckert | 1989-09-26 |
| 4837362 | Preparation of pure hydroxylammonium salts of fatty acids of 1 to 4 carbon atoms | Franz-Josef Weiss | 1989-06-06 |
| 4806638 | Neutralization of reaction mixtures obtained by Beckman rearrangement of cyclohexanone oxime | Uwe Brand, Ruediger Schmitz, Ernst Deuker | 1989-02-21 |
| 4804473 | Removal of water-immiscible solvents from offgases containing same | Uwe Brand, Emile DeDecker, Ernst Deuker, Klaus Kartte, Gerald Neubauer +1 more | 1989-02-14 |
| 4795571 | Purification of frozen crystal layers | Bernhard Holzknecht, Eckhard Hetzel, Klaus Wintermantel, Peter Thoma | 1989-01-03 |