Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5846833 | Method and apparatus for testing a non-hydrocarbon refrigerant | Warren Clough, John Attanasio, William A. Faris, H. Harvey Michels, David A. Condit | 1998-12-08 |
| D344527 | Refrigerant recovery unit | Thomas E. Drago, Richard J. Duell | 1994-02-22 |
| 5255527 | Method of testing the purity of refrigerant flowing through a refrigeration system | — | 1993-10-26 |
| 5247804 | Method and apparatus for recovering and purifying refrigerant including liquid recovery | Chester D. Ripka | 1993-09-28 |
| 5243828 | Control system for compressor protection in a manually operated refrigerant recovery apparatus | Richard J. Duell | 1993-09-14 |
| 5214931 | Apparatus for sampling the purity of refrigerant in the storage container of a refrigerant recovery and purification system | — | 1993-06-01 |
| 5181390 | Manually operated refrigerant recovery apparatus | Wayne B. Cavanaugh, Chester D. Ripka | 1993-01-26 |
| 5174124 | Apparatus for sampling the purity of refrigerant flowing through a refrigeration circuit | Chester D. Ripka | 1992-12-29 |
| 5146760 | Method and apparatus for compressor protection in a refrigerant recovery system | — | 1992-09-15 |
| 5146761 | Method and apparatus for recovering refrigerant | Wayne B. Cavanaugh | 1992-09-15 |
| 5127232 | Method and apparatus for recovering and purifying refrigerant | Chester D. Ripka | 1992-07-07 |
| 5081846 | Control of space heating and water heating using variable speed heat pump | Kevin F. Dudley, Kevin B. Dunshee | 1992-01-21 |
| 5052186 | Control of outdoor air source water heating using variable-speed heat pump | Kevin F. Dudley, Kevin B. Dunshee, Roger J. Voorhis | 1991-10-01 |
| 5050394 | Controllable variable speed heat pump for combined water heating and space cooling | Kevin F. Dudley, Kevin B. Dunshee | 1991-09-24 |