Issued Patents All Time
Showing 25 most recent of 44 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5700358 | Recovery of caprolactam from oligomers and/or polymers of caprolactam | Josef Ritz, Gerald Neubauer | 1997-12-23 |
| 5639706 | Hydrogenation catalyst based on a platinum metal partially poisoned with finely divided sulfur | Franz-Josef Weiss, Gerald Neubauer, Heinz-Walter Schneider | 1997-06-17 |
| 5637700 | Purification of caprolactam | Gerald Neubauer, Claus-Ulrich Priester | 1997-06-10 |
| 5560895 | Method of use of a hydrogenation catalyst based on a platinum metal partially poisoned with finely divided sulfur | Franz-Josef Weiss, Gerald Neubauer, Heinz-Walter Schneider | 1996-10-01 |
| 5536831 | Obtaining caprolactam by cleavage of molten polycaprolactam | Michael Kopietz, Alan Handerman, Simon Jones, Ulrich Kalck, Claus-Ulrich Priester +3 more | 1996-07-16 |
| 5496789 | Hydrogenation catalyst based on a platinum metal partially poisoned with finely divided sulfur | Franz-Josef Weiss, Gerald Neubauer, Heinz-Walter Schneider | 1996-03-05 |
| 5458740 | Process for the purification of crude caprolactam | Thomas P. Losier, Donald R. Johnson, Gerald Neubauer, Josef Ritz | 1995-10-17 |
| 5441607 | Recovery of caprolactam from distillation residues obtained in the purification of caprolactam | Josef Ritz, Hans J. Wilfinger, David Weatherford | 1995-08-15 |
| 5360905 | Recovery of caprolactam from oligomers and/or polymers of caprolactam | Claus-Ulrich Priester, Gerald Neubauer, Erwin Brunner, Josef Ritz, Michael Kopietz | 1994-11-01 |
| 5359062 | Recovery of caprolactam from polycaprolactam | Gerald Neubauer, Josef Ritz, Claus-Ulrich Priester | 1994-10-25 |
| 5350847 | Purification of caprolactam | Gerald Neubauer, Claus-Ulrich Priester | 1994-09-27 |
| 5264571 | Preparation of caprolactam by Beckmann rearrangement of cyclohexanone oxime | Gerald Neubauer, Josef Ritz | 1993-11-23 |
| 5236685 | Preparation of hydroxylammonium salts | Franz-Josef Weiss, Josef Ritz | 1993-08-17 |
| 5155081 | Platinum-on-graphite catalysts | Werner Steigleiter, Wolfgang Hoelderich, Franz-Josef Weiss, Luc Guns, Gerald Neubauer +1 more | 1992-10-13 |
| 5143872 | Method of regenerating inactive and poisoned platinum catalysts | Franz-Josef Weiss | 1992-09-01 |
| 5124138 | Work-up of aqueous mother liquors containing hydrochloric acid, sulfuric acid and their hydroxyl-ammonium and ammonium salts | Gerald Neubauer, Josef Ritz | 1992-06-23 |
| 5120699 | Platinum-on-graphite catalysts and the use thereof | Franz-Josef Weiss, Werner Steigleiter, Wolfgang Hoelderich, Luc Guns, Gerald Neubauer +1 more | 1992-06-09 |
| 5032684 | Continuous purification of caprolactam | Gerald Neubauer, Josef Ritz, David Agar, Rolf Fischer, Uwe Vagt | 1991-07-16 |
| 4997635 | Preparation of crystalline hydroxylammonium sulfate having a low ammonium sulfate content | Gerald Neubauer, Josef Ritz, Franz-Josef Weiss | 1991-03-05 |
| 4931592 | Storability of molten cyclohexanone oxime | David Agab, Gerald Neubauer, Josef Ritz | 1990-06-05 |
| 4927542 | Elimination of hydroxylammonium salts from wastewaters containing such salts | David Agar | 1990-05-22 |
| 4892624 | Workup of distillation residues from the purification of caprolactam | — | 1990-01-09 |
| 4889704 | Preparation of hydroxylammonium salts | Josef Ritz, Erwin Thomas, Franz-Josef Weiss | 1989-12-26 |
| 4882430 | Recovery of caprolactam from caprolactam distillation low boilers or high boilers or mixtures thereof | Gerald Neubauer, Emile De Decker, Bernhard Holzknecht, Josef Ritz | 1989-11-21 |
| 4873369 | Purification of cyclohexanone oxime containing ammonium sulfate | — | 1989-10-10 |