Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822420 | Sealing composition for soil barriers | Rudolf Burkhardt, Hansjurgen Hass, Reiner Hitze | 1989-04-18 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822420 | Sealing composition for soil barriers | Rudolf Burkhardt, Hansjurgen Hass, Reiner Hitze | 1989-04-18 |