Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868268 | Process for preparing polyurethanes from an organic diisocyanate ester | Roland Gipp | 1989-09-19 |
| 4855484 | Process for the preparation of 4-hydroxyphenyl 4-hydroxybenzoate and the use thereof | Roland Gipp | 1989-08-08 |
| 4851531 | Isocyanurate group-containing polyisocyanates | Reinhard Halpaap, Gerhard Klein, Roland Richter, Josef Pedain, Hans-Joachim Kreuder | 1989-07-25 |
| 4837321 | Process for the preparation of polyisocyanates containing isocyanurate groups | Dimitrios Kerimis | 1989-06-06 |
| 4826948 | Impregnating agent and its use | Bernhard Jansen, Roland Richter, Dietmar Schapel, Rudolf Schmidt | 1989-05-02 |
| 4824595 | Polyisocyanate compositions containing reversibly blocked catalysts and addition products of sulfonyl isocyanates with catalysts having a tin(II)- or tin(IV)-carboxylate structure | Roland Richter, Rudolf Hombach, Manfred Dollhausen, Geza Avar, Hans-Albrecht Freitag | 1989-04-25 |
| 4810536 | Method of impregnating | Bernhard Jansen, Roland Richter, Dietmar Schapel, Rudolf Schmidt | 1989-03-07 |