Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5482458 | Heat treatment of expansible materials to form lightweight aggregate | — | 1996-01-09 |
| 4906183 | Treatment of expansible materials to form lightweight aggregate | Peter A. Young, Allon C. Day | 1990-03-06 |
| 4728471 | Treatment of expansible materials to form lightweight aggregate | Peter A. Young, Allon C. Day | 1988-03-01 |