Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4348542 | Process for the production of mixtures of alkylated aromatic hydroxy compounds | Rainer Neumann, Gerhard Friedhofen, Dieter Freitag, Jürgen Heuser, Hans-Helmut Schwarz | 1982-09-07 |
| 4338429 | Process for working up polycarbonates | John Goossens, Ludwig Bottenbruch, Dieter Freitag | 1982-07-06 |
| 4316980 | Process for the preparation of tetramethylated bisphenol polycarbonates | Karsten-Josef Idel, Dieter Freitag, Gerd Fengler | 1982-02-23 |