Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7575392 | Concrete-molded stone and ready-to-assemble construction made of molded stones | — | 2009-08-18 |
| 7108448 | Paving stone kit | — | 2006-09-19 |
| 6749793 | Method for mechanically treating concrete blocks | — | 2004-06-15 |
| 6263633 | Paving stone, set of paving stones and device for producing the same | — | 2001-07-24 |
| D421135 | Paving stone pattern | — | 2000-02-22 |
| 5597591 | Apparatus for the production of concrete paving stones | — | 1997-01-28 |
| 5588775 | Paving stone set and process and device for the manufacture thereof | — | 1996-12-31 |
| 5486066 | Paving stone set and process and device for the manufacture thereof | — | 1996-01-23 |
| 5480267 | Set of structural elements made up of concrete blocks, and a gravity retaining wall erected therefrom | — | 1996-01-02 |
| 5281048 | Plate-shaped concrete block and process and device for the manufacture of the same | — | 1994-01-25 |
| 5224792 | Shaped (concrete) slab kit | — | 1993-07-06 |
| 4773790 | Groundcovering element, especially (concrete) slab | — | 1988-09-27 |
| 4711606 | Shaped (concrete) block for retaining walls and also a retaining wall | Menno Leling | 1987-12-08 |