Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889882 | Tetramethyl piperidyl terminated triazine oligomeric esters and amides | John F. Stephen | 1989-12-26 |
| 4883831 | Melamine-based light stabilizers for plastics | John F. Stephen | 1989-11-28 |
| 4883860 | Triazine-based light stabilizers for plastics | John F. Stephen | 1989-11-28 |
| 4851461 | Tetraalkyl piperidylated stabilizers for plastics | John F. Stephen | 1989-07-25 |
| 4804699 | Monomeric and oligomeric glutarate-based light stabilizers for plastics | John F. Stephen | 1989-02-14 |