Issued Patents All Time
Showing 26–35 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6606871 | Twinning interface control box kit for twinned fan coils in dual heat pump or AC system | Ronald G. Butcher | 2003-08-19 |
| 6494057 | Combination accumulator filter drier | Larry D. Burns | 2002-12-17 |
| 6354097 | Method and apparatus for limiting refrigerant pressure in heating mode | — | 2002-03-12 |
| 6141978 | Method and apparatus for eliminating unnecessary defrost cycles in heat pump systems | — | 2000-11-07 |
| 6092378 | Vapor line pressure control | Sathish R. Das, Larry J. Burkhart, Ronald G. Butcher, Timothy J. Perry | 2000-07-25 |
| 5787728 | Suction accumulator destratifier | Satish R. Das, Larry J. Burkhart | 1998-08-04 |
| 5758507 | Heat pump defrost control | Hong Mei Liang, Louis J. Sullivan | 1998-06-02 |
| 5689972 | Refrigerant expansion device | Jeffrey L. Jones, Loren D. Hoffman, Jeffery A. Storie | 1997-11-25 |
| 5647533 | Run time criteria to control indoor blower speed | Larry J. Burkhart, Hongmei Liang, Frederick J. Keller, Jr. | 1997-07-15 |
| 5533568 | Managing supplementary heat during defrost on heat pumps | Hongmei Liang, Larry J. Burkhart, Gary D. Wedlake | 1996-07-09 |