Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6664558 | Non-prismatic optical liquid level sensing assembly | — | 2003-12-16 |
| 6578373 | Rate of change detector for refrigerant floodback | — | 2003-06-17 |
| 6557412 | Non-fouling liquid level control | Mark Doane | 2003-05-06 |
| 5765994 | Low oil detector with automatic reset | — | 1998-06-16 |
| 5627770 | Superheat gage with plug-in data module | Andrew R. Chibnall | 1997-05-06 |
| 5539674 | Minimum reading pressure gage with dual function sensor | Andrew R. Chibnall, Mudhukant Shah | 1996-07-23 |
| 5278426 | Optical liquid level sensor for pressurized systems utilizing prismatic element | — | 1994-01-11 |
| 5103648 | Oil level control system | — | 1992-04-14 |
| 5072595 | Apparatus for detecting small bubbles in a pressurized fluid stream | — | 1991-12-17 |
| 5031068 | Liquid level control system for refrigeration apparatus | Charles C. Hansen, III, John A. Yencho, Curtis H. Knapp, Orval Kuhn | 1991-07-09 |
| 4934156 | Evaporator pressure regulating valve controlled by an auxiliary force for a refrigerator installation | — | 1990-06-19 |
| 4809129 | Liquid level control system for refrigeration apparatus | Charles C. Hansen, III, John A. Yencho, Curtis H. Knapp, Orval Kuhn | 1989-02-28 |
| 4448038 | Refrigeration control system for modulating electrically-operated expansion valves | — | 1984-05-15 |
| 4442680 | Pilot-operated pressure regulator valve | J. George Leimbach | 1984-04-17 |
| 4425767 | Refrigeration control system for modulating electrically-operated expansion valves | — | 1984-01-17 |
| 4362027 | Refrigeration control system for modulating electrically-operated expansion valves | — | 1982-12-07 |