Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5169990 | Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene | Winfried Orth, Wolfgang Weiss, Hans W. Kleffner | 1992-12-08 |
| 5149886 | Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene | Winfried Orth, Wolfgang Weiss, Hans W. Kleffner | 1992-09-22 |
| 5066806 | Novel separation process | Winfried Orth, Wolfgang Weiss, Hans W. Kleffner | 1991-11-19 |
| 4582910 | Method for preparation of 4-halogenonaphthalic acid anhydrides | Winfried Orth, Werner Fickert | 1986-04-15 |
| 4564700 | Process for the preparation of fluorene-9-carboxylic acid | Winfried Orth, Werner Fickert | 1986-01-14 |
| 4549024 | Oxidation of quinoline to quinolinic acid | Winfried Orth, Werner Fickert | 1985-10-22 |
| 4510090 | Method for the production of phenanthrenequinone | Dietrich Tonnius, Wolfgang Weiss, Winfried Orth, Heinrich Miele | 1985-04-09 |
| 4228083 | Process for the production of .beta.-(5-nitro-2-furyl)-acrolein | Winfried Orth, Werner Fickert | 1980-10-14 |