Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861537 | Process of making a sintered polybenzimidazole article | Bennett C. Ward, Ralph S. Blake | 1989-08-29 |
| 4814530 | Sintered polybenzimidazole article | Bennett C. Ward, Ralph S. Blake | 1989-03-21 |