Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4326500 | Solar radiation collector | Winfried Bernhardt, Edgard Grundmann | 1982-04-27 |
| 4296732 | Solar radiation collector | Winfried Bernhardt, Edgard Grundmann | 1981-10-27 |
| 4190038 | Solar heater | Herbert Heitland, Edgard Grundmann | 1980-02-26 |