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| Number | Title | Issue Date |
| 6925836 | Built-in type refrigerator Disclosed is a built-in refrigerator provided in a sink and effectively discharging heat from a condenser and a compressor. The built-in refrigerator includes a cabinet provided in the sink and a component chamber at a rear bottom thereof and a dust guard provided a... | 08/09/2005 |
| 4403574 | Boiler pancake design A device constituting an improved boiler design. The heat exchanger, known in the art as a pancake, is composed of an asymmetrical grid of interconnected hollow eliptical conduits through which flow the heat transfer fluid. In one embodiment of the invent... | 09/13/1983 |
| 4383499 | Cast metal heat exchanger and method of formation A cast metal heat exchanger (e.g. of iron or aluminum) for a hot water boiler having a plurality of flueways and waterways and which is rectangular in plan view down onto the flueways with the waterways extending parallel to the minor rectangular axis. A ... | 05/17/1983 |
| 4357909 | Fluid heater with spiral hot gas flow A fluid heater embodies an upright shell with discs vertically arrayed in the shell interior. The discs are angled and configured induce spiral upward flow of hot gases, in external contact with the discs which themselves contain or pass fluid to be heate... | 11/09/1982 |
| 4310746 | Electric fluid heating apparatus A fluid heating apparatus includes a thermally insulated housing divided by a thermally insulated vertical partition into a flue passage and a heat exchange chamber, the partition having top and bottom openings providing communication between the passage ... | 01/12/1982 |
| 3934554 | Water and room heater A water and room heating unit for extracting heat from combustible material. The heating unit includes a firebox chamber formed from a plurality of water chambers that are arranged in a U-shape and are interconnected by a first network of pipes which also... | 01/27/1976 |
