Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4921987 | Aqueous solutions of alkyltrialkoxysilanes having an extended shelf life | Hans-Jurgen Hass | 1990-05-01 |
| 4822420 | Sealing composition for soil barriers | Rudolf Burkhardt, Hansjurgen Hass, Gunther Zoche | 1989-04-18 |