Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5324469 | Method of making single wood concrete layer sound absorption panel | Hansruedi Walter | 1994-06-28 |
| 5314744 | Double coated free aggregate usable in wood concrete technology and method of making the same | Hansruedi Walter | 1994-05-24 |
| 5019170 | Coated free aggregate usable in wood concrete technology and method of making the same | Hansruedi Walter | 1991-05-28 |