Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5495551 | Fast recovery circuit for heat pump water heater | Carl C. Hiller | 1996-02-27 |
| 5255338 | Heat pump water heater control circuit | Andrew L. Blackshaw | 1993-10-19 |
| 5238058 | Spiral flighted double walled heat exchanger | Douglas M. Bodrey, Carl C. Hiller, Andrew L. Blackshaw | 1993-08-24 |
| 5052187 | Water flow control for heat pump water heaters | — | 1991-10-01 |
| 4955930 | Variable water flow control for heat pump water heaters | — | 1990-09-11 |
| 4740673 | Dual control thermostat circuit | — | 1988-04-26 |
| 4646538 | Triple integrated heat pump system | Andrew L. Blackshaw | 1987-03-03 |
| 4598557 | Integrated heat pump water heater | Andrew L. Blackshaw | 1986-07-08 |
| 4330309 | Heat pump water heater | — | 1982-05-18 |
| 4299275 | Heat transfer system | — | 1981-11-10 |
| 4219076 | Heat transfer system | — | 1980-08-26 |
| 4190800 | Electrical load management system | Jack R. Kelly | 1980-02-26 |
| 4182409 | Heat transfer system | — | 1980-01-08 |