Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6322742 | Method of producing stackable concrete blocks | — | 2001-11-27 |
| 6082067 | Dry stackable block structures | — | 2000-07-04 |
| D411315 | Stackable, mortarless landscape edging block having a rear wing element | — | 1999-06-22 |
| 5623797 | Block structure and system for arranging above-ground fencing, railing and/or sound barriers | Robert A. Gravier | 1997-04-29 |