Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5500452 | Soft, low density flexible polyurethane foam | Frank E. Critchfeld, Paul M. Westfall | 1996-03-19 |
| 4902723 | Process for producing flexible polyurethane foam using hexahydro-s-triazine catalysts | Frank E. Critchfield, Paul M. Westfall | 1990-02-20 |
| 4814359 | Process for producing flexible polyurethane foam using hexahydro-S-triazine catalysts | Frank E. Critchfield, Paul M. Westfall | 1989-03-21 |