Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6486363 | Process for the manufacture of bis(4-hydroxyaryl)alkanes | Hans-Josef Buysch, Alfred Eitel, Gerhard Fennhoff, Georg Malamet, Clauss Wulff | 2002-11-26 |
| 5780690 | Bisphenol synthesis on modified ion-exchange resins using specially purified carbonyl compounds | Gerhard Fennhoff, Ralf Pakull, Hans-Josef Buysch, Bernhard Wehrle, Alfred Eitel +2 more | 1998-07-14 |
| 5693697 | Flame-resistant polycarbonate moulding-compositions | Richard Weider, Klaus Horn | 1997-12-02 |
| 5545764 | Process for the continuous production of high purity bisphenol A | Claus Wulff, Georg Malamet, Alfred Eitel, Kurt P. Meurer, Tony van Osselaer +1 more | 1996-08-13 |
| 5455282 | Process of regenerating sulfonic acid cation exchange resins with a mercaptoethylamine or thiazolidine | Georg Malamet, Franz Backes, Alfred Eitel, Claus Wulff | 1995-10-03 |
| 5395857 | Optimized ion exchanger beds for the synthesis of bisphenol A | Georg Malamet, Alfred Eitel, Claus Wulff | 1995-03-07 |
| 5302774 | Process for the production of bisphenols | Hans-Josef Buysch, Alfred Eitel, Gerhard Fennhoff, Otto Immel, Ralf Pakull +2 more | 1994-04-12 |
| 5269887 | Process for the purification of bisphenols | Wolfgang Jakob, Manfred Schmidt, Dieter Freitag | 1993-12-14 |
| 5210328 | Process for the preparation of substituted cycloalkylidene bisphenols | Dieter Freitag, Claus Wulff, Alfred Eitel, Helmut Waldmann, Uwe Westeppe +3 more | 1993-05-11 |
| 5128437 | Polycarbonate from bi(tetrahydrofuran)di phenol | Uwe Westeppe, Hans-Josef Buysch, Ulrich Grigo | 1992-07-07 |
| 5004569 | Process for the production of carboxylic acid esters | Helmut-Martin Meier, Klaus Kircher | 1991-04-02 |
| 4980426 | Moulding compounds of polycarbonate mixtures having a high disperse solubility | Guther Weymans, Ulrich Grigo, Ludwig Bottenbruch | 1990-12-25 |
| 4954569 | Use of homopolycarbonates of 3,3'-dihydroxydiphenyl ether for modifying films of thermoplastics | Gunther Weymans, Ulrich Grigo, Karsten-Josef Idel, Ludwig Bottenbruch | 1990-09-04 |
| 4943502 | Photosensitive recording material suited for use in electrophotography containing dihydroquinoline charge transport compounds | David R. Terrell, Marcel J. Monbaliu, Ulrich Grigo | 1990-07-24 |
| 4902746 | Use of mixtures of polycarbonates and styrene polymers as substrates for optical storage media | Volker Serini, Ulrich Grigo, Leo Morbitzer, Karl-Erwin Piejko, Klaus Summermann | 1990-02-20 |
| 4874816 | Vinyl copolymers with grafted-on polycarbonate chains, their production and use | Ralf Dujardin, Wolfgang Ebert, Rolf-Volker Meyer, Ulrich Grigo, Wolfgang Wehnert | 1989-10-17 |
| 4873314 | Process for the production of polycarbonate solutions | Karsten-Josef Idel, Ulrich Grigo | 1989-10-10 |
| 4826634 | Fluorinated alkylamidosulphonates, their preparation, their use as flame retardants, and polycarbonate moulding compositions containing them | Bernd Baasner, Ulrich Grigo | 1989-05-02 |