Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868249 | Cyanoethylation of hydroxyethylated polybenzimidazole polymers | — | 1989-09-19 |
| 4826502 | Sulfonation of hydroxyethylated polybenzimidazole fibers | Frank J. Onorato, Harry S. Pulaski | 1989-05-02 |
| 4814228 | Wet spun hydroxyethylated polybenzimidazole fibers | Frank J. Onorato, Arthur G. Schlask | 1989-03-21 |
| 4814399 | Sulfoalkylation of polybenzimidazole | Balaram Gupta, Robert W. Stackman | 1989-03-21 |
| 4814400 | Polybenzimidazole ester and carboxylic acid | — | 1989-03-21 |