Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861862 | Polyetherimide amide from polyoxyalkylene diimide dicarboxylic acid | John A. Tyrell | 1989-08-29 |
| 4798858 | Flame retardant polyetherimide ester elastomers | Nan-I Liu, John A. Tyrell | 1989-01-17 |
| 4795790 | Thermoplastic polyetherimide ester polymers exhibiting improved flexibility | John A. Tyrell | 1989-01-03 |