Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE37295 | Water and/or oil-impermeable sealing mat consisting substantially of a substrate layer, a layer of swellable clay and a cover layer | Georg Heerten, Volkhard Muller | 2001-07-24 |
| 5221568 | Water and/or oil-permeable sealing mat consisting substantially of a substrate layer, a layer of swellable clay and a cover layer | Georg Heerten, Volkard Muller | 1993-06-22 |