Quotables
"If you build a better mousetrap, you will catch better mice."
George Gobel
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6058719 | Heat pump apparatus having refrigerant level indication and associated methods A heat pump apparatus maintains a desired constant amount of subcooling at an outlet of a condenser and a desired constant amount of superheat at an outlet of an evaporator, thereby requiring a charge defining level of refrigerant within a refrigerant sto... | 05/09/2000 |
| 5771700 | Heat pump apparatus and related methods providing enhanced refrigerant flow control A heat pump apparatus includes a start assist valve for permitting refrigerant to flow from an outlet of a condenser to an inlet of an evaporator during start-up of the heat pump apparatus. The heat pump apparatus preferably includes an expansion orifice ... | 06/30/1998 |
| 5687578 | Heat pump apparatus and related methods producing enhanced refrigerant flow stability A heat pump apparatus includes a liquid refrigerant flow control valve connected in fluid communication between a condenser and evaporator. The liquid flow control valve includes a refrigerant outlet tube connected in fluid communication with an expansion... | 11/18/1997 |
| 5561985 | Heat pump apparatus including earth tap heat exchanger A ground-coupled direct expansion heat pump apparatus includes an earth tap heat exchanger including a plurality of earth contacting tubes connected together in side-by-side relation. A first earth contacting tube defines a vapor refrigerant passageway an... | 10/08/1996 |
| 5560220 | Method for testing an earth tap heat exchanger and associated apparatus A method for identifying a leaking earth tap heat exchanger includes measuring an electrical resistance between the electrically conducting tubing of the earth tap heat exchanger and the surrounding soil or water to determine if the electrically insulatin... | 10/01/1996 |
| 4831843 | Fluid flow control system A fluid flow control system for use with a heat exchange apparatus which includes a first heat exchange or condensor to extract heat from the heat exchange apparatus, a compressor and a second heat exchange or evaporator to provide heat to the heat exchan... | 05/23/1989 |
