Issued Patents All Time
Showing 1–25 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5270471 | Process for making alkylated polyalkylenepolyamines by selective alkylation | John T. Lai | 1993-12-14 |
| 5240977 | Multi-component stabilizer system for polyolefins pigmented with azo and disazo pigments | George Kletecka, John T. Lai | 1993-08-31 |
| 5239071 | Process for methylating a hindered nitrogen atom in an inert non-aqueous solvent | Victor L. Ledesma, George Kletecka | 1993-08-24 |
| 5189173 | Alkylated polyalkylene polyamines and process for selective alkylation | John T. Lai | 1993-02-23 |
| 5098944 | Thermooxidative stabilization of polymers with a N4-alkylated oxo-piperazinyl-triazine | George Kletecka, John T. Lai | 1992-03-24 |
| 5096949 | N,N-disubstituted, .alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.alpha.,.alpha.-disubstituted acetamides and composition stabilized therewith | John T. Lai | 1992-03-17 |
| 5071981 | Alkylated oxo-piperanzinyl-triazine | John T. Lai, Peter D. Smith, Leonard E. R. Kosinski | 1991-12-10 |
| 5053505 | Process for the manufacture of a tri-substituted triazine stabilizer | John T. Lai, Ronald M. Kovach | 1991-10-01 |
| 4929653 | Stabilized pigmented polypropylene fiber resistant to gas fade | George Kletecka, John T. Lai | 1990-05-29 |
| 4920228 | N,N-disubstituted, .alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.alpha.,.alpha.-disubstituted acetamides and composition stabilized therewith | John T. Lai | 1990-04-24 |
| 4841053 | Process for desensitizing a 1-(alkylamino)alkyl-polysubstituted piperazinone during recovery | Charles P. Jacobs, Ronald M. Kovach, John T. Lai | 1989-06-20 |
| 4797438 | Stabilized gamma-irradiated polypropylene and sterilizable articles thereof | George Kletecka, John T. Lai | 1989-01-10 |
| 4780495 | N -(substituted)-.alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.alpha.,.alpha.-disu bstituted acetamides, and composition stabilized therewith | John T. Lai | 1988-10-25 |
| 4722806 | Alkylated polyalkylenepolyamines, substituted oxo-piperazinyl-triazines and UV light stabilized compositions | John T. Lai | 1988-02-02 |
| 4698446 | Synthesis of polyamines and mixture formed thereby, of diprimary polyalkylene polyamines with disubstituted N-adjacent terminal carbon atom(s) | John T. Lai | 1987-10-06 |
| 4692487 | 1,2-ethanediyl-bis-2-piperazinone esters, oligomers thereof, and compositions stabilized thereby | John T. Lai | 1987-09-08 |
| 4687850 | Purification of 1-(2-amino-2-alkylpropyl)-3,3,5,5-tetraalkylpiperazinones | Charles P. Jacobs | 1987-08-18 |
| 4675353 | Hindered 2-keto-1,4-diazacycloalkane oligomers containing triazine rings and compositions stabilized thereby | John T. Lai | 1987-06-23 |
| 4650903 | Oligomeric amides as synergists for antioxidants and UV stabilizers | John T. Lai | 1987-03-17 |
| 4639479 | Polyalkylenepolyamine having pendant substituted oxo-piperazinyltriazines and UV light stabilized compositions | John T. Lai | 1987-01-27 |
| 4629752 | Substituted oxo-piperazinyl-triazines and UV light stabilized compositions | Robert W. Layer, John T. Lai | 1986-12-16 |
| 4547538 | Alkylated polyalkylenepolyamines, substituted oxo-piperazinyl-triazines and UV light stabilized compositions | John T. Lai | 1985-10-15 |
| 4480092 | Alkylated polyalkylenepolyamines, substituted oxo-piperazinyl-triazines | John T. Lai | 1984-10-30 |
| 4477665 | Substituted 2-keto-1,4-diazacycloalkanes | John T. Lai | 1984-10-16 |
| 4472548 | Oligomeric phenylphosphonites | George Kletecka | 1984-09-18 |