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Class Information
Number: 137/564
Name: Fluid handling > Systems > Closed circulating system > With thermal circulating means (thermo-siphons)
Description: Systems comprising a circulating system in which the thermal characteristics of the system are such that temperature differences exist at spaced points in the device and cause flow of the fluent material.

Patents under this class:

Patent Number Title Of Patent Date Issued
8453665 Self-acting self-circulating fluid system without external pressure source and use in bearing system Jun. 4, 2013
6378447 Furnace with liquid-cooled grate elements and cooling circuit Apr. 30, 2002
6196246 Freeze-resistant plumbing system in combination with a backflow preventer Mar. 6, 2001
5918625 Integral water circulation apparatus Jul. 6, 1999
5671771 Hot water system Sep. 30, 1997
5586720 Hot water supply system with a ring pipeline Dec. 24, 1996
4917142 Secondary circulation unit Apr. 17, 1990
4893749 Mixer valve for heating installations Jan. 16, 1990
4759382 System of hot and immediate water for taps-water and energy saving Jul. 26, 1988
4672990 System for freeze protection of pipes Jun. 16, 1987
4541412 Check valve and spring to prevent forward and reverse thermosiphoning in solar collector systems Sep. 17, 1985
4465020 Apparatus for prevention of freezing of water line Aug. 14, 1984
4457326 System for providing temporary water service between a water main and one or more locations normally connected to the main Jul. 3, 1984
4409959 Solar energy water preheat system Oct. 18, 1983
4346731 Buoyant element check valve for a thermosiphon energy system Aug. 31, 1982
4245617 Valve Jan. 20, 1981
4146087 Device for accumulation tanks for fluid Mar. 27, 1979

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