Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7586012 | Process for recovering an adduct of a bis(4-hydroxyaryl)alkane and a phenolic compound | Johann-Wilhelm Frey, Manfred Hagel | 2009-09-08 |
| 5723688 | Process for preparing an adduct of a bisphenol with phenolic compound | Johann-Wilhelm Frey, Hartwig Sendner | 1998-03-03 |
| 5512700 | Process for purifying a bisphenol | Karl Kraehling, Jochen Gressmann | 1996-04-30 |
| 5288926 | Process for preparing a bisphenol | Dieter Tank, Jochen Gressmann, Johann-Wilhelm Frey, Ulrich Wallbaum | 1994-02-22 |