Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5188879 | Polyimide foam filled structures | Francis U. Hill, Werner Frank | 1993-02-23 |
| 4980389 | Polyetherimide foam precursors and foams having improved physical properties and methods of making them | Francis U. Hill, Werner Frank | 1990-12-25 |