Issued Patents All Time
Showing 1–25 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6723881 | Method for conditioning ion exchangers | Michael Bödiger, Rainer Neumann, Frieder Heydenreich, Michael Prein, Ulrich Schnegg +3 more | 2004-04-20 |
| 6723885 | Bisphenol production | Frieder Heydenreich, Michael Prein, Michael Bödiger, Rainer Neumann, Johan Vaes | 2004-04-20 |
| 6486363 | Process for the manufacture of bis(4-hydroxyaryl)alkanes | Klaus Berg, Hans-Josef Buysch, Alfred Eitel, Georg Malamet, Clauss Wulff | 2002-11-26 |
| 6316678 | Method for producing dis(4-hydroxyaryl) alkanes | Steffen Kuhling, Rolf Lanze, Rainer Neumann, Frieder Heydenreich, Tony van Osselaer | 2001-11-13 |
| 6307111 | Method for continuous production of dihydroxydiarylalkanes | Hans-Josef Buysch, Gerd Fengler | 2001-10-23 |
| 6288284 | Method for producing bis(4-hydroxyaryl)alkanes | Rob Eek, Kaspar Hallenberger, Christine Mendoza-Frohn, Georg Ronge, Domien Sluyts +1 more | 2001-09-11 |
| 6268538 | Method for producing and purifying 3-(4-Hydroxyphenyl)-1, 1,3-trimethylindan-5-ol | Stefan Westernacher, Claudia Laukotter, Jurgen Stebani | 2001-07-31 |
| 6211417 | Process for preparing bis-(4-hydroxyaryl) alkanes | Gerd Fengler, Hans-Josef Buysch, Frieder Heydenreich, Rob Eek | 2001-04-03 |
| 6191316 | Method for processing mother liquors from the production of bisphenol | Hans-Josef Buysch, Gerd Fengler | 2001-02-20 |
| RE36432 | Process for the purification of polycarbonate and polyester carbonate solutions | Pieter Ooms, Hans-Josef Buysch, Ralf Pakull | 1999-12-07 |
| 5914431 | Cocatalysts for the synthesis of bisphenols | — | 1999-06-22 |
| 5780690 | Bisphenol synthesis on modified ion-exchange resins using specially purified carbonyl compounds | Klaus Berg, Ralf Pakull, Hans-Josef Buysch, Bernhard Wehrle, Alfred Eitel +2 more | 1998-07-14 |
| 5773491 | (Co)polycarbonates stabilized against .gamma.-radiation | Wolfgang Ebert, Ralf Hufen, Ru digerart | 1998-06-30 |
| 5698600 | Process for the production of bisphenols with the use of new cocatalysts | Claus Wulff, Alfred Eitel | 1997-12-16 |
| 5684062 | (Co)polycarbonates stabilised against .gamma.-radiation | Wolfgang Ebert, Ralf Hufen, Rudiger Schubart | 1997-11-04 |
| 5612398 | Radiation-resistant polycarbonates | Ralf Hufen, Klaus Kircher, Wolfgang Ebert | 1997-03-18 |
| 5464893 | Radiation-resistant polycarbonates | Rick L. Archey, Charles E. Lundy, Aaron D. Meltzer, Harald Pielartzik, Ralf Hufen +3 more | 1995-11-07 |
| 5420241 | Process for the purification of polycarbonate and polyester carbonate solutions | Pieter Ooms, Hans-Josef Buysch, Ralf Pakull | 1995-05-30 |
| 5410014 | Method of preparing aliphatic-aromatic polycarbonates | Wilfried Haese, Ralf Pakull, Jurgen Kirsch | 1995-04-25 |
| 5408027 | Process for the production of aliphatic-aromatic polycarbonates | Wilfried Haese, Ralf Pakull, Jurgen Kirsch | 1995-04-18 |
| 5399600 | Stabilized, flame resistant polycarbonate moulding compounds | Hans-Josef Buysch, Gerd Fengler, Klaus Horn | 1995-03-21 |
| 5393835 | Polycarbonate/ABS molding compounds | Thomas Eckel, Dieter Wittmann, Jochen Schoeps, Karl-Heinz Ott, Wolfgang Jakob | 1995-02-28 |
| 5382605 | Polycondensates which can be sterilized by .gamma.-radiation | Douglas G. Powell, Charles E. Lundy, Ralf Hufen, Klaus Kircher | 1995-01-17 |
| 5376715 | Heat stabilization or aromatic polycarbonates | Jurgen Kirsch, Karsten-Josef Idel, Klaus Kircher, Charles E. Lundy | 1994-12-27 |
| 5357028 | Method of preparing polycarbonates and polyester carbonates | Ralf Pakull, Werner Struver, Jurgen Kirsch | 1994-10-18 |