Issued Patents All Time
Showing 1–25 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6534620 | Hydroxy-functional polyurethane carbonates, a process for their preparation and their use as binders | Wieland Hovestadt, Martin Melchiors | 2003-03-18 |
| 5854358 | Polymerizing monomers in presence of polyol and castor oil-polyol product | Torsten Heinemann, Manfred Dietrich, Gundolf Jacobs, Mark R. Kratz, Josef Sanders +1 more | 1998-12-29 |
| 5837796 | Polyisocyanates containing isocyanurate groups and prepared by trimerizing alkyl-substituted cycloaliphatic diisocyanates | Bernhard Jansen, Rolf-Volker Meyer | 1998-11-17 |
| 5786438 | Mixtures of cycloaliphatic diisocyanates, a process for their preparation and their use for the production of polyisocyanate addition products | Bernhard Jansen, Klaus Jost, Rolf-Volker Meyer | 1998-07-28 |
| 5698601 | Process for the production of open-celled rigid polyurethane foams useful as insulating materials | Rainer Welte | 1997-12-16 |
| 5476892 | Process for conditioning and stabilizing polyols | Hartmut Nefzger, Helmut Reiff, Bernd Quiring | 1995-12-19 |
| 5418258 | Process for the production of substantially closed-cell rigid foams containing urethane, urea and biuret groups showing excellent adhesion to solid surfaces and their use | Rainer Welte | 1995-05-23 |
| 5386054 | Process for the purification of polyisocyanates, the polyisocyanates thus purified and use thereof | Hanns P. Muller, Rainer Welte | 1995-01-31 |
| 5354888 | Process for the production of organic carbodiimides and their use as stabilizers for plastics | — | 1994-10-11 |
| 5350780 | Process for the preparation of substantially closed-cell rigid foams containing urethane, urea, biuret, and isocyanurate groups and a method of use thereof | Rainer Welte | 1994-09-27 |
| 5342881 | Process for the standardization and stabilization of organic polyisocyanates and the stable products of this process | Hanns P. Muller, Manfred Kapps | 1994-08-30 |
| 5260481 | Process for the conditioning and/or purification of organic isocyanates | — | 1993-11-09 |
| 5258508 | Process for the preparation of oligomeric polyisocyanates and their use | — | 1993-11-02 |
| 5218111 | Process for the production of polyisocyanates containing uretdione and isocyanurate groups | — | 1993-06-08 |
| 5202358 | Process for the preparation of liquid storable organic isocyanates containing carbodiimide and/or uretone imine groups and their use for the preparation of polyurethane plastics | Rainer Welte | 1993-04-13 |
| 5128471 | Process for the production of organic amines, polyamine mixtures and their use as hardeners for polymer precursors | — | 1992-07-07 |
| 5124370 | Polyisocyanate mixtures containing isocyanurate groups, a process for their production and their use for the production of polyurethane foams | Rainer Welte, Gunter Gleitsmann | 1992-06-23 |
| 5070115 | Substantially closed-cell rigid foams containing urethane, urea and biuret groups and a process for their production | Rainer Welte | 1991-12-03 |
| 5013838 | Polyisocyanates containing isocyanurate groups and a process for their production | — | 1991-05-07 |
| 4992548 | New catalysts, their use for the production of isocyanurate polyisocyanates | Josef Pedain | 1991-02-12 |
| 4960848 | Process for the production of polyisocyanates containing isocyanurate groups and their use | Josef Pedain | 1990-10-02 |
| 4935534 | 1-(N-formylamino)-2,4-dicyanobutane and a process for its production | — | 1990-06-19 |
| 4923952 | Monoformylated 3,3'-diaminodipropylamines, a process for their production and their use | Helmut Reiff | 1990-05-08 |
| 4918235 | 1,5-Diaminoheptanol-1,6, | Josef Pedain | 1990-04-17 |
| 4847152 | Microcapsules with improved polyurea walls | Gert Jabs, Ulrich Nehen | 1989-07-11 |