Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4826613 | Lubricating oil containing dispersant viscosity index improver | Christopher S. Liu | 1989-05-02 |
| 4795577 | Lubricating oil containing dispersant viscosity index improver | Maria M. Kapuscinski, Christopher S. Liu | 1989-01-03 |