Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6171015 | Anchoring of outdoor traffic areas provided with cobblestones or paving stones | Michael Schmitz | 2001-01-09 |
| D431305 | Paving stone | Michael Schmitz | 2000-09-26 |
| D425628 | Paving stone | Michael Schmitz | 2000-05-23 |
| 5902069 | Artificial paving stone with identical spacer elements having a tooth and a tooth recess | Michael Schmitz | 1999-05-11 |
| D404836 | Paving element | Michael Schmitz | 1999-01-26 |
| 5797698 | Paving elements for the water-permeable reinforcement of surfaces | Michael Schmitz | 1998-08-25 |
| D389926 | Paving element | Michael Schmitz | 1998-01-27 |
| 5445442 | Drive-slip control system | Rolf Maier | 1995-08-29 |
| 4583341 | Interlocking ground covering elements and arrangements of them for mechanical laying | Fritz von Langsdorff | 1986-04-22 |
| 4194853 | Method and apparatus for producing a ground covering from individual paving stones | Fritz von Langsdorff, Kurt Rossmann | 1980-03-25 |
| 4185939 | Ground covering slab | Fritz von Langsdorff | 1980-01-29 |