Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4678406 | Variable volume ratio screw compressor with step control | Joseph W. Pillis, David A. Murphy, Paul Nemit, Jr. | 1987-07-07 |
| 4548549 | Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current | David A. Murphy | 1985-10-22 |
| 4519748 | Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current | David A. Murphy | 1985-05-28 |
| 4516914 | Micro-processor control of moveable slide stop and a moveable slide valve in a helical screw rotary compressor | David A. Murphy | 1985-05-14 |