Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6148576 | Energy conserving wall unit and method of forming same | — | 2000-11-21 |
| 5257880 | Retaining wall construction and blocks therefor | — | 1993-11-02 |
| 5044834 | Retaining wall construction and blocks therefor | — | 1991-09-03 |
| 4566238 | Energy conserving concrete masonry unit, wall construction and method | — | 1986-01-28 |