Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874885 | Process for the preparation of mercaptomethylphenols | Werner Stegmann, Samuel Evans, Roger Martin, Reto Luisoli | 1989-10-17 |
| 4863982 | Isocyanuric acid derivatives | Werner Stegmann, Eduard Troxler, Peter Hofmann, Paul Dubs | 1989-09-05 |
| 4857572 | Substituted phenols as stabilizers | Gerrit Knobloch | 1989-08-15 |
| 4855345 | Stabilizers for organic polymers | Siegfried Rosenberger | 1989-08-08 |
| 4828741 | N-substituted tetrahydroquinolines for use as antioxidants in lubricants | Samuel Evans | 1989-05-09 |
| 4798822 | Selected 3,9-di(2,2,6,6-tetramethyl-4-piperidyl)-2,4,8,10-tetraoxa-3,9-diphosphas piro [5,5]undecanes | Michael Rasberger, Peter Hofmann, Paul Dubs | 1989-01-17 |