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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 6389830 | Solar refrigeration and heating system usable with alternative heat sources An apparatus for heating and cooling includes a solar collector for transferring heat energy from incident solar rays to a liquid refrigerant material thereby changing a first portion to a gaseous state. An eductor-venturi reduces a pressure of the gaseou... | 05/21/2002 |
| 6260370 | Solar refrigeration and heating system usable with alternative heat sources An apparatus for heating and cooling includes a solar collector for transferring heat energy from incident solar rays to a liquid refrigerant material thereby changing a first portion to a gaseous state. An eductor-venturi reduces a pressure of the gaseou... | 07/17/2001 |
| 6253572 | Non-drip suction accumulator, receiver and heat exchanger A suction accumulator for a refrigeration system includes a pair of closed shells arranged in spaced relation one within the other to define a space therebetween effective to prevent sweating of the inner shell during performance of its normal suction acc... | 07/03/2001 |
| 6167945 | Non-freezing watering dish for animals A non-freezing dish includes a sealed tube having a heating end and an opposite condensation end configured to be inserted into the ground with the heated end below grade. A phase change material having a gas phase and a liquid phase is sealed in the tube... | 01/02/2001 |
| 5794611 | Solar collector A solar collector includes a copper plate and copper tubes for the collection and harnessing of solar energy. The copper tubes are thermally coupled to the copper plate by a copper alloy fillet. The copper tubes, the copper plate and the copper alloy fill... | 08/18/1998 |
| 5722146 | Method of assembling a suction accumulator in a receiver for a heat exchanger A method of assembling a two-chamber component includes radially deforming an outer chamber to permit an inner chamber, which includes a fusible plug, to be inserted into the outer chamber. The inner chamber includes a fusible plug that extends radially a... | 03/03/1998 |
| 5011105 | Collector stand A collector stand for a solar collector, including a frame adapted to be secured to the solar collector, a cylindrical end cap secured to the frame and adapted to be sleeved over the upper end of a mounting post for the solar collector, and structure secu... | 04/30/1991 |
| 4044948 | Solar heating system component The solar heating system component combines a surge tank for a closed solar heat collecting system along with heat exchange means for transferring heat from the primary fluid in the solar heat collecting system to secondary fluid flowing in a secondary ci... | 08/30/1977 |
