Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4955285 | System for covering the energy requirement of a room | Bruno Keller | 1990-09-11 |
| 4914718 | System for covering the energy required for lighting and heating a building | Bruno Keller | 1990-04-03 |