Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4659555 | Process for the preparation of basic copper carbonate | Werner Gottfried, Lothar Witzke | 1987-04-21 |
| 4654931 | Hinge device with brake spring for tilting windows | Siegfried Sonneborn, Manfred Handel, Carl F. Gerstrom, Peter H. Sorensen | 1987-04-07 |
| 4621466 | Flashing frame for the installation of adjacent roof windows | Siegfried Sonneborn, Manfred Handel | 1986-11-11 |
| 4543753 | Flashing frame for the installation of adjacent roof windows | Siegfried Sonneborn, Manfred Handel | 1985-10-01 |