Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE36432 | Process for the purification of polycarbonate and polyester carbonate solutions | Gerhard Fennhoff, Pieter Ooms, Hans-Josef Buysch | 1999-12-07 |
| 5780690 | Bisphenol synthesis on modified ion-exchange resins using specially purified carbonyl compounds | Klaus Berg, Gerhard Fennhoff, Hans-Josef Buysch, Bernhard Wehrle, Alfred Eitel +2 more | 1998-07-14 |
| 5545710 | Use of special polycarbonates for the production of optical articles | Wilfried Haese, Friedrich-Karl Bruder, J urgen Kirsch, Hartmut L ower | 1996-08-13 |
| 5420241 | Process for the purification of polycarbonate and polyester carbonate solutions | Gerhard Fennhoff, Pieter Ooms, Hans-Josef Buysch | 1995-05-30 |
| 5410014 | Method of preparing aliphatic-aromatic polycarbonates | Wilfried Haese, Gerhard Fennhoff, Jurgen Kirsch | 1995-04-25 |
| 5408027 | Process for the production of aliphatic-aromatic polycarbonates | Wilfried Haese, Gerhard Fennhoff, Jurgen Kirsch | 1995-04-18 |
| 5357028 | Method of preparing polycarbonates and polyester carbonates | Gerhard Fennhoff, Werner Struver, Jurgen Kirsch | 1994-10-18 |
| 5302774 | Process for the production of bisphenols | Klaus Berg, Hans-Josef Buysch, Alfred Eitel, Gerhard Fennhoff, Otto Immel +2 more | 1994-04-12 |
| 5191001 | Process for the production of solventless polycarbonate | Steffen Kuhlig, Ulrich Grigo, Peter Tacke, Dieter Freitag, Wolfgang Alewelt | 1993-03-02 |
| 5134219 | Stiff-chain polyheterocycles having improved solubility, a process for their production and their use | Hans R. Kricheldorf, Jurgen Engelhardt, Volker Eckhardt, Ulrich Leyrer | 1992-07-28 |
| 5102971 | Soluble polyaromatic compounds | Thomas Himmler, Rudolf Braden, Joachim Genz, Karsten-Josef Idel | 1992-04-07 |
| 5084550 | Copolycarbonate from mixture of polyarylene diol | Dieter Freitag, Volker Eckhardt, Karsten-Josef Idel, Hans R. Kricheldorf, Dierik Lubbers | 1992-01-28 |
| 4985532 | Thermotropic polyesters, a process for their production and their use for the production of moldings, filaments and films | Dieter Freitag, Volker Eckhardt, Karsten-Josef Idel, Uwe Westeppe | 1991-01-15 |
| 4931534 | Thermotropic aromatic polyesters, a process for their production and their use for the production of moldings, filaments, fibers and films | Volker Eckhardt, Joachim Genz, Karsten-Josef Idel, Hans R. Kricheldorf, Volker Doring | 1990-06-05 |
| 4861857 | Thermotropic polyesterimide from N-carboxyalkylene trimellitimide having excellent processibility, a process for their production and their use for the production of moldings, filaments, fibers and films | Hans R. Kricheldorf, Volker Eckhardt, Hans-Rudolf Dicke | 1989-08-29 |
| 4631333 | Process for the preparation of polyimide esters of trimellitic acid | Hans R. Kricheldorf, Hans-Rudolf Dicke | 1986-12-23 |