Issued Patents All Time
Showing 1–25 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6344505 | Mono- and bis-benzotriazolyldihydroxybiaryl UV absorbers | Donald Valentine, Jr., Thomas P. Sassi | 2002-02-05 |
| 5053516 | Synthesis of 2-substituted-5-methylpyridines from methylcyclobutanecarbonitrile, valeronitrile and pentenonitrile intermediates | Ludwig Hartmann | 1991-10-01 |
| 4981964 | Oligomeric polyesters and polyamides containing dipiperidyl triazine groups | Richard V. Nelson | 1991-01-01 |
| 4965394 | Difunctional polyfluoroaromatic derivatives and a process of preparing the same | Ludwig Hartmann | 1990-10-23 |
| 4925938 | N-2,2-dimethyl-2-(2-hydroxy-alkylphenyl) heterocycles and stabilized compositions | James P. Neilan | 1990-05-15 |
| 4889882 | Tetramethyl piperidyl terminated triazine oligomeric esters and amides | Richard V. Nelson | 1989-12-26 |
| 4883860 | Triazine-based light stabilizers for plastics | Richard V. Nelson | 1989-11-28 |
| 4883831 | Melamine-based light stabilizers for plastics | Richard V. Nelson | 1989-11-28 |
| 4866185 | Difunctional polyfluoroaromatic derivatives and a process of preparing the same | Ludwig Hartmann | 1989-09-12 |
| 4851461 | Tetraalkyl piperidylated stabilizers for plastics | Richard V. Nelson | 1989-07-25 |
| 4826983 | N-2,2-dimethyl-2-(2-hydroxy-alkylphenyl) heterocycles and stabilized compositions | James P. Neilan | 1989-05-02 |
| 4804699 | Monomeric and oligomeric glutarate-based light stabilizers for plastics | Richard V. Nelson | 1989-02-14 |
| 4801757 | Noncrystalline tris(4-hydroxy-2-methyl-5-tert. butylphenyl) butane | Jerry H. Smith | 1989-01-31 |
| 4786750 | Pentene derivatives | Richard V. Nelson | 1988-11-22 |
| 4783547 | Polyfluoroaromatic nitriles | Ludwig Hartmann | 1988-11-08 |
| 4754052 | Method for recovering diphenylethers from their nitrated by-products | William W. Brand | 1988-06-28 |
| 4734502 | Process for the preparation of 2,2,6,6-tetramethyl-4-oxopiperidine | Walter M. Kruse | 1988-03-29 |
| 4710527 | Malonate-based light stabilizers for plastics | Richard V. Nelson | 1987-12-01 |
| 4709063 | Preparation of 2-halo-5-methylpyridines from 4-methyl-4-pentene derivatives | Richard V. Nelson | 1987-11-24 |
| 4701485 | Malonate-based light stabilizers for plastics | Richard V. Nelson | 1987-10-20 |
| 4690963 | Tartrate-based light stabilizers for plastics | Richard V. Nelson | 1987-09-01 |
| 4689360 | Oligomeric malonate-based light stabilizers for plastics | Richard V. Nelson | 1987-08-25 |
| 4687854 | Bispiperidone precursor of 2-substituted-5-methyl-pyridines | Ludwig Hartmann | 1987-08-18 |
| 4687800 | Tartrate-based light stabilizers for plastics | Richard V. Nelson | 1987-08-18 |
| 4658031 | Synthesis of 2-substituted-5-methyl-pyridines and intermediates therefor | Ludwig Hartmann | 1987-04-14 |