Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4541412 | Check valve and spring to prevent forward and reverse thermosiphoning in solar collector systems | Michael Kast, Harry T. Whitehouse | 1985-09-17 |
| 4450868 | Freeze protection apparatus for solar collectors | Eugene F. Duval, Michael Kast, Gilbert M. Masters, Harry T. Whitehouse | 1984-05-29 |
| 4395882 | Freeze protection apparatus for solar collectors | Michael Kast, Harry T. Whitehouse | 1983-08-02 |
| 4280478 | Freeze protection apparatus for solar collectors | Eugene F. Duval, Michael Kast, Gilbert M. Masters, Harry T. Whitehouse | 1981-07-28 |