Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845204 | Cosmetic compositions on the basis of alkyl-hydroxypropyl-substituted chitosan derivatives, new chitosan derivatives and processes for the production thereof | Gerhard Maresch, Hans-Rudi Lenz, Eugen Konrad, Lothar Breuer, Dietrich Hoch | 1989-07-04 |
| 4835266 | Cosmetic compositions based upon n-hydroxypropyl-chitosans, new n-hydroxypropyl-chitosans, as well as processes for the production thereof | Gerhard Maresch, Harald Wendel, Eugen Konrad, Hans-Rudi Lenz, Jurgen Titze | 1989-05-30 |
| 4822598 | Cosmetic agent on the basis of quaternary chitosan derivatives, novel quaternary chitosan derivatives as well as processes for making same | Harald Wendel, Eugen Konrad | 1989-04-18 |