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Class Information
Number: 137/94
Name: Fluid handling > Self-proportioning or correlating systems > Fuel controlled by boiler or water system condition
Description: Subject matter in which a condition of the fluid in a boiler or water heating system controls the flow of fuel used for heating the boiler or water.

Patents under this class:

Patent Number Title Of Patent Date Issued
8594851 Wastewater collection flow management system and techniques Nov. 26, 2013
6754541 Control system apparatus for loading a value of a system parameter and preventing change thereto after a period of time Jun. 22, 2004
5875807 Flow control especially for instantaneous water heater Mar. 2, 1999
5297535 Ignition device for water heaters Mar. 29, 1994
5224445 Boiler water liquid level control Jul. 6, 1993
4655239 Water-pressure-operated gas valve for instantaneous gas water heater Apr. 7, 1987
4465088 Construction of low water level sensing device for hot water boiler Aug. 14, 1984
4383544 Boiler low water level sensing device May. 17, 1983
4335848 System of central heating Jun. 22, 1982
4304249 Control units Dec. 8, 1981
4180088 Water shutoff system Dec. 25, 1979
3931712 Internal combustion engine turbocharger pressure control regulators Jan. 13, 1976

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