Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5223200 | Method for producing concrete roof tiles | Hans E. Schulz | 1993-06-29 |
| 5004415 | Apparatus for producing concrete roof tiles | Hans E. Schulz, Friedrich Echl | 1991-04-02 |