Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33775 | Pulse controlled expansion valve for multiple evaporators and method of controlling same | David P. Hargraves | 1991-12-24 |
| 4685309 | Pulse controlled expansion valve for multiple evaporators and method of controlling same | — | 1987-08-11 |
| 4467613 | Apparatus for and method of automatically adjusting the superheat setting of a thermostatic expansion valve | David P. Hargraves | 1984-08-28 |
| 4244182 | Apparatus for controlling refrigerant feed rate in a refrigeration system | — | 1981-01-13 |
| 4232528 | Frost detector | — | 1980-11-11 |