Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6996945 | Self interlocking block system | — | 2006-02-14 |
| 6213754 | Apparatus for manufacturing concrete masonry units | Robert Jeffry Maddy | 2001-04-10 |
| 6030446 | Cementitious compositions and lightweight structural units | Robert Jeffry Maddy | 2000-02-29 |