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| Number | Title | Issue Date |
| 6378447 | Furnace with liquid-cooled grate elements and cooling circuit The furnace with liquid-cooled grate elements has an inflow and a return to these grate elements, the inflow and the return being connected to a condensation device open to the atmosphere. The inflow has arranged in it a U-shaped cooling-liquid seal, one ... | 04/30/2002 |
| 6196246 | Freeze-resistant plumbing system in combination with a backflow preventer A plumbing system which, when ambient outdoor temperatures drop below freezing, circulates water to prevent it from freezing, utilizing a check valve to prevent water from flowing back into the water main and further utilizing a relief valve which can ope... | 03/06/2001 |
| 5918625 | Integral water circulation apparatus An integral water circulation apparatus supplies instant hot water at hot water faucets remotely located from the building water heater through a convective circulation flow of hot water from the water heater It is therefore simpler in design, less expens... | 07/06/1999 |
| 5671771 | Hot water system A hot water plumbing system comprising a water heater, a delivery location, a delivery line delivering water from said heater to said delivery location, a riser located adjacent said delivery location and extending upward above the level of said heater, a... | 09/30/1997 |
| 5586720 | Hot water supply system with a ring pipeline A hot water supply system is provided, which includes a ring pipeline which extends through a water heater and in which water circulates, before going through tap pipelines to taps. The circulation pipelines have a substantially smaller cross-section than... | 12/24/1996 |
| 4917142 | Secondary circulation unit A device for effecting secondary circulation of water into a hot water tank not having a return opening. The arms of a T-fitting are place in series with the distribution line near the outlet port of the water tank. A return line, continuous at one end wi... | 04/17/1990 |
| 4893749 | Mixer valve for heating installations The invention refers to a mixer valve, particularly for heating and hot water installations, which is integrated into the housing of a circulation pump in such a manner that the wheel-shaped actuator, which is provided with blades, and the running wheel o... | 01/16/1990 |
| 4759382 | System of hot and immediate water for taps-water and energy saving The present invention consists in a distributing unit to be connected to a central hot water supply system, said unit comprising a housing consisting of two longitudinally extending pipes located one within the second, a number of primary pipes located in... | 07/26/1988 |
| 4672990 | System for freeze protection of pipes A system for freeze protection of pipes is provided, comprising a cold water supply line, connected to a main water supply line at one end and to at least one cold water fixture at the other end; a hot water tank having an inlet and an outlet; a hot water... | 06/16/1987 |
| 4541412 | Check valve and spring to prevent forward and reverse thermosiphoning in solar collector systems A freeze protection system allows the working fluid contained in the communicating tubes of the solar collector to drain from both the input and output tubes of the collector when a first predetermined temperature of the working fluid is detected and to f... | 09/17/1985 |
| 4465020 | Apparatus for prevention of freezing of water line An animal watering apparatus has a thermal insulated tank having a water storage chamber. An upright tubular member located in the chamber has openings in its opposite ends to permit thermal circulation of the water in the chamber. Animal actuated water d... | 08/14/1984 |
| 4457326 | System for providing temporary water service between a water main and one or more locations normally connected to the main A system for providing temporary water service between a water main and one or more locations normally connected to the main in which a pipeline is provided above ground and has a supply section and a return section which are connected to the main. Each o... | 07/03/1984 |
| 4409959 | Solar energy water preheat system A passive thermosiphon loop of circulating heat transport liquid transfers heat from an inclined absorber to a heat exchanger in thermal contact with a second fluid. Reverse thermosiphoning under normal conditions is prevented by a ball type check valve. ... | 10/18/1983 |
| 4346731 | Buoyant element check valve for a thermosiphon energy system A check valve for a thermosiphoning solar energy system having a buoyant movably disposed element situated between primary and auxiliary valve seats. Under normal operating conditions flow enters the top of the valve and passes downwardly through the prim... | 08/31/1982 |
| 4245617 | Valve A unidirectional valve for use, e.g., in a thermosyphon solar heating system including a collector, a storage tank, and a liquid having a transfer portion in the collector and a storage portion in the tank, the valve comprising a partition, having a prede... | 01/20/1981 |
| 4146087 | Device for accumulation tanks for fluid Method and device for maintaining and reinforcing in an accumulation tank a stratified condition of fluid caused by the fluid in the tank when a flowing of the fluid is caused by heating the same. The portion of the fluid in the tank that is to be heated ... | 03/27/1979 |
