Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877836 | Viscosity index improver and composition containing same | — | 1989-10-31 |
| 4849481 | Star shaped asymmetric block copolymer of monoalkenyl aromatic hydrocarbon and conjugated diene | Arthur R. Bean | 1989-07-18 |