Issued Patents 1989
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886611 | Hydrocarbon compositions containing polyolefin graft polymers | Larry D. Grina, Ronald E. Jones, Rodney L. Sung | 1989-12-12 |
| 4877415 | Hydrocarbon compositions containing polyolefin graft polymers | Larry D. Grina, Ronald E. Jones, Rodney L. Sung | 1989-10-31 |
| 4842756 | Multifunctional viscosity index improver | Christopher S. Liu, Larry D. Grina, Ronald E. Jones | 1989-06-27 |
| 4836943 | Anti-oxidant system | Christopher S. Liu, Ronald E. Jones, Larry D. Grina | 1989-06-06 |
| 4820776 | Hydrocarbon compositions containing polyolefin graft polymers having amine and phenothiazine grafted moieties | Larry D. Grina, Ronald E. Jones, Rodney L. Sung | 1989-04-11 |
| 4816172 | Clear high-performance multifunction VI improvers | Larry D. Grina, Lee Ann Brugger | 1989-03-28 |
| 4812261 | Lubricating oil containing viscosity index improver | Christopher S. Liu, Nicholas Benfaremo, Larry D. Grina | 1989-03-14 |
| 4798678 | Hydrocarbon containing anti-oxidant system | Christopher S. Liu, Larry D. Grina | 1989-01-17 |
| 4795577 | Lubricating oil containing dispersant viscosity index improver | William P. Hart, Christopher S. Liu | 1989-01-03 |