Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883825 | Process for the manufacture of low density, flexible polyurethane foams | Frank E. Critchfield, William A. Gill | 1989-11-28 |
| 4814359 | Process for producing flexible polyurethane foam using hexahydro-S-triazine catalysts | Otis M. Baker, Frank E. Critchfield | 1989-03-21 |