Issued Patents All Time
Showing 1–25 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6222075 | Process for the production of N, N, N', N',-tetra-(2-hydroxyethyl)ethylene diamine | Klaus Ihrig, Christian Blaufelder | 2001-04-24 |
| 6159894 | Catalyst for dehydrogenation of amino alcohols to amino carboxylic acids or of ethylene glycol (derivatives) to oxycarboxylic acids, method for their production and their use | Ludwig Eisenhuth | 2000-12-12 |
| 4670556 | Process for the production of thiazolyl-2-sulphenamides | Hans Zengel, Ludwig Eisenhuth | 1987-06-02 |
| 4558135 | Process for the preparation of dithiazolyl disulfides | Hans Zengel, Ludwig Eisenhuth | 1985-12-10 |
| 4486603 | Preparation of trans cyclohexane 1,4-diamine | Hans Zengel | 1984-12-04 |
| 4468526 | Process for the preparation of thiuram disulfides | Ludwig Eisenhuth, Hans Zengel | 1984-08-28 |
| 4467114 | Preparation of trans cyclohexane 1,4-diurea | Hans Zengel | 1984-08-21 |
| 4459424 | Process for the preparation of thiuram disulfides | Ludwig Eisenhuth, Hans Zengel | 1984-07-10 |
| 4457871 | Preparation of trans cyclohexane,1,4-diisocyanate and related compounds | Hans Zengel | 1984-07-03 |
| 4439370 | Preparation of trans cyclohexane 1,4-diisocyanate | Hans Zengel | 1984-03-27 |
| 4418211 | Preparation of trans-cyclohexane-1,4-disulphonyl urea | Hans Zengel | 1983-11-29 |
| 4404401 | Process for the preparation of para-amino-diphenylamine | Hans Zengel | 1983-09-13 |
| 4393238 | Method for the production of blocked isocyanates | Hans Zengel | 1983-07-12 |
| 4357447 | Polymere N-halogenamide auf basis von acryl-und methacrylamid | Hans Zengel, Rainer Zielke | 1982-11-02 |
| 4356289 | Polymeric N-halogenoamides on the basis of acrylamide and methacrylamide | Hans Zengel, Rainer Zielke | 1982-10-26 |
| 4346233 | Process for the preparation of ureas | Hans Zengel, Rainer Zielke | 1982-08-24 |
| 4342707 | Process for the preparation of bis-N-chloramides | Hans Zengel | 1982-08-03 |
| 4317947 | Process for the preparation of nitrosobenzene | Hans Zengel | 1982-03-02 |
| 4316031 | Process for the preparation of 2-mercaptobenzothiazole | Hans Zengel, Heinz Praetorius | 1982-02-16 |
| 4314089 | Process for the preparation of nitrosobenzene | Hans Zengel, Werner Klostermeier | 1982-02-02 |
| 4307236 | Process for the preparation of dithiazole-disulfides | Hans Zengel, Ludwig Eisenhuth | 1981-12-22 |
| 4301257 | Polyfunctional isocyanates free of alkali and urea groups | Hans Zengel, Rainer Zielke | 1981-11-17 |
| 4275223 | Preparation of trans-cyclohexane-1,4-diurethanes | Hans Zengel | 1981-06-23 |
| 4259258 | Preparation of bis-n-chloramides of cycloaliphatic carboxylic acids | Hans Zengel | 1981-03-31 |
| 4242523 | Process for the preparation of para-nitroso-diphenyl-hydroxylamines | Paul K. Battey, Peter Hope | 1980-12-30 |