Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6835343 | Method for handling concrete retaining wall blocks | James A. Manthei | 2004-12-28 |
| 6715965 | Retaining wall blocks and retaining walls constructed from such blocks | James A. Manthei | 2004-04-06 |
| D486246 | Concrete cap for a wall | — | 2004-02-03 |
| 6679656 | Connection for geogrid to concrete block earth retaining walls | — | 2004-01-20 |