Issued Patents 1989
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877834 | Lubricating oil containing a Mannich base | Donald J. Clarke, Larry D. Grina | 1989-10-31 |
| 4845157 | Diesel fuel compositions containing polyolefin graft polymers | Mark Levin, Constance A. Gallagher, William A. Buscher, Jr. | 1989-07-04 |
| 4842756 | Multifunctional viscosity index improver | Maria M. Kapuscinski, Larry D. Grina, Ronald E. Jones | 1989-06-27 |
| 4836943 | Anti-oxidant system | Maria M. Kapuscinski, Ronald E. Jones, Larry D. Grina | 1989-06-06 |
| 4826613 | Lubricating oil containing dispersant viscosity index improver | William P. Hart | 1989-05-02 |
| 4812261 | Lubricating oil containing viscosity index improver | Nicholas Benfaremo, Maria M. Kapuscinski, Larry D. Grina | 1989-03-14 |
| 4798678 | Hydrocarbon containing anti-oxidant system | Larry D. Grina, Maria M. Kapuscinski | 1989-01-17 |
| 4795577 | Lubricating oil containing dispersant viscosity index improver | William P. Hart, Maria M. Kapuscinski | 1989-01-03 |