Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4476920 | Method and apparatus for integrating operation of a heat pump and a separate heating source | Alan S. Drucker, Richard D. Jeffers | 1984-10-16 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4476920 | Method and apparatus for integrating operation of a heat pump and a separate heating source | Alan S. Drucker, Richard D. Jeffers | 1984-10-16 |