Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4954619 | O-benzyl-N-hydroxyalkyl derivatives of chitosan and nail polish containing the same | Gunther Lang, Gerhard Maresch | 1990-09-04 |
| 4931271 | Cosmetic compostions based upon N-hydroxybutyl-chitosans, N-hydroxybutyl-chitosans as well as processes for the production thereof | Gunther Lang, Eugen Konrad, Harald Wendel, Gerhard Maresch | 1990-06-05 |
| 4923977 | Cosmetic composition based upon N-hydroxypropylisopropylether chitosans as well as new N-hydroxypropylisopropylether derivatives of chitosan | Gunther Lang, Gerhard Maresch | 1990-05-08 |
| 4845204 | Cosmetic compositions on the basis of alkyl-hydroxypropyl-substituted chitosan derivatives, new chitosan derivatives and processes for the production thereof | Gunther Lang, Gerhard Maresch, 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 | Gunther Lang, Gerhard Maresch, Harald Wendel, Eugen Konrad, Jurgen Titze | 1989-05-30 |
| 4780310 | Cosmetic compositions based upon N-hydroxypropyl-chitosans, new N-hyroxypropyl-chitosans, as well as processes for the production thereof | Guther Lang, Gerhard Maresch, Harald Wendel, Eugen Konrad, Jurgen Titze | 1988-10-25 |