Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5788761 | Process for the manufacture of construction materials | Klaus F. Lippe | 1998-08-04 |
| 4422989 | Method of producing hydrothermally cured aerated concrete building units | Armin Hartmann, Klaus F. Lippe, Werner Wetzig | 1983-12-27 |
| 4211571 | Method of producing gas concrete | Armin Hartmann | 1980-07-08 |