Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843277 | Single crystal emitter with heater wire embedded therein | Otto Winkler | 1989-06-27 |
| 4819432 | Installation for harnessing thermal energy | Christian Schneider, Hans-Peter Doetsch, Helmut Krauss | 1989-04-11 |