Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5945485 | Viscosity modifier polybutadiene polymers | Gary W. Verstrate, Lewis J. Fetters | 1999-08-31 |
| 5744429 | Mixed ethylene alpha olefin copolymer multifunctional viscosity modifiers useful in lube oil compositions | David Yen-Lung Chung, Paul Brice, Steven James Searis, John B. Gardiner | 1998-04-28 |
| 5703171 | Viscosity modifier polybutadiene polymers | Gary W. Verstrate, Lewis J. Fetters | 1997-12-30 |
| 5543469 | Viscosity modifier polymers | Gary Ver Strate, Lewis J. Fetters | 1996-08-06 |
| 5446221 | Oleaginous compositions containing novel ethylene alpha-olefin polymer viscosity index improver additive | — | 1995-08-29 |
| 5427702 | Mixed ethylene alpha olefin copolymer multifunctional viscosity modifiers useful in lube oil compositions | David Yen-Lung Chung, Paul Brice, Steven James Searis, John B. Gardiner | 1995-06-27 |
| 5401427 | Viscosity index improver | David Yen-Lung Chung | 1995-03-28 |
| 5348673 | Multifunctional viscosity index improver derived from amido-amine and degraded ethylene copolymer exhibiting improved low temperature viscometric properties | David Yen-Lung Chung, Antonio Gutierrez | 1994-09-20 |
| 5312556 | Multifunctional viscosity index improver derived from polyamine containing one primary amine group and at least one tertiary amine group and degraded ethylene copolymer | David Yen-Lung Chung | 1994-05-17 |
| 5310814 | Viscosity modifier polybutadiene polymers | Gary W. Verstrate, Lewis J. Fetters | 1994-05-10 |
| 5310490 | Viscosity modifer polymers | Gary Ver Strate, Lewis J. Fetters | 1994-05-10 |
| 5290461 | Multifunctional viscosity index improver derived from amido-amine and degraded ethylene copolymer exhibiting improved low temperature viscometric properties (PT-768) | David Yen-Lung Chung, Antonio Gutierrez | 1994-03-01 |
| 5290868 | Multifunctional viscosity index improver derived from polyamine containing one primary amine group and at least one secondary amine group and degraded ethylene copolymer | David Yen-Lung Chung, Antonio Gutierrez | 1994-03-01 |
| 5262075 | Multifunctional viscosity index improver exhibitng improved low temperature viscometric properties | David Yen-Lung Chung, John E. Johnston | 1993-11-16 |
| 5252238 | Multifunctional viscosity index improver derived from amido-amine exhibiting improved low temperature viscometric properties | David Yen-Lung Chung, Antonio Gutierrez, John E. Johnston, Robert D. Lundberg | 1993-10-12 |
| 5244590 | Viscosity index improver | David Yen-Lung Chung | 1993-09-14 |
| 5167848 | Grafted viscosity index improver | David Yen-Lung Chung, John E. Johnston | 1992-12-01 |
| 5151204 | Oleaginous compositions containing novel ethylene alpha-olefin polymer viscosity index improver additive | — | 1992-09-29 |
| 5118433 | Multifunctional viscosity index improver derived from amido-amine and degraded ethylene copolymer exhibiting improved low temperature viscometric properties | David Yen-Lung Chung, Antonio Gutierrez | 1992-06-02 |
| 5068047 | Visosity index improver | David Yen-Lung Chung | 1991-11-26 |
| 5053151 | Multifunctional viscosity index improver derived from amido-amine exhibiting improved low temperature viscometric properties | David Yen-Lung Chung, Antonio Gutierrez, John E. Johnston, Robert D. Lundberg | 1991-10-01 |
| 4900461 | Viscosity modifier polymers (E-98) | Gary Ver Strate, Ricardo Bloch, John E. Johnston, Roger K. West | 1990-02-13 |
| 4804794 | Viscosity modifier polymers | Gary Ver Strate, Ricardo Bloch, John E. Johnston, Roger K. West | 1989-02-14 |