Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5711796 | Bituminous compositions having enhanced performance properties | Kenneth F. Grzybowski, William Russell Welliver, Timothy J. Roth | 1998-01-27 |
| 5658972 | Fire retardant plastic construction material | Kenneth F. Grzybowski, William Russell Welliver, Timothy J. Roth | 1997-08-19 |