Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9221234 | High density polyurethane and polyisocyanurate construction boards and composite boards | John B. Letts | 2015-12-29 |
| 8453390 | High density polyurethane and polyisocyanurate construction boards and composite boards | John B. Letts | 2013-06-04 |
| 7972688 | High density polyurethane and polyisocyanurate construction boards and composite boards | John B. Letts | 2011-07-05 |
| 6632509 | Fire retardant EPDM roofing membrane compositons for use on high-sloped roofs | James A. Davis, William F. Barham, Jr. | 2003-10-14 |