Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |
| 4790948 | Lubricating oil containing dispersant viscosity index improver | Christopher S. Liu, William P. Hart | 1988-12-13 |
| 4767553 | Lubricating oil containing dispersant viscosity index improver | William P. Hart, Christopher S. Liu | 1988-08-30 |
| 4764304 | Hydrocarbon compositions containing polyolefin graft polymers | Christopher S. Liu, William P. Hart | 1988-08-16 |
| 4699723 | Dispersant-antioxidant multifunction viscosity index improver | Ronald E. Jones | 1987-10-13 |
| 4640788 | Hydrocarbon compositions containing polyolefin graft polymers | Christopher S. Liu, William P. Hart, Larry D. Grina | 1987-02-03 |