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Class Information
Number: 236/10
Name: Automatic temperature and humidity regulation > Hot-air furnace
Description: Subject matter comprising hot air furnaces which are provided with automatic temperature regulating means. In the devices of this subclass the fire is generally regulated by the temperature in the air space of the furnace.

Sub-classes under this class:

Class Number Class Name Patents
236/11 Air and fire control 128

Patents under this class:
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Patent Number Title Of Patent Date Issued
8201750 Fuel economizer improvements Jun. 19, 2012
8123518 Burner firing rate determination for modulating furnace Feb. 28, 2012
7870854 Closed-loop control system for heating systems Jan. 18, 2011
7575178 Heat recovery apparatus Aug. 18, 2009
7385863 Semiconductor memory device Jun. 10, 2008
7296426 Interactive control system for an HVAC system Nov. 20, 2007
6886754 Thermostat operable from various power sources May. 3, 2005
6637667 Method and apparatus for energy recovery in an environmental control system Oct. 28, 2003
6609904 Gas furnace control arrangement Aug. 26, 2003
6360955 Method and means for automated variable heater control for agricultural unit heaters Mar. 26, 2002
6109531 High reliability heating system Aug. 29, 2000
5971284 Apparatus for regulating heater cycles to improve forced-air heating system efficiency Oct. 26, 1999
5729474 Method of anticipating potential HVAC failure Mar. 17, 1998
5666889 Apparatus and method for furnace combustion control Sep. 16, 1997
5616995 Systems and methods for controlling a draft inducer for a furnace Apr. 1, 1997
5522541 Method for proving furnace high-heat pressure switch Jun. 4, 1996
5520327 Electronic thermostat having safety feature May. 28, 1996
5467920 Thermostat with adjustment for the cycling rate of the heating plant Nov. 21, 1995
5340028 Adaptive microprocessor control system and method for providing high and low heating modes in a furnace Aug. 23, 1994
5337952 Adaptive microprocessor control system and method for providing multiple heating modes in twinned furnaces Aug. 16, 1994
5226590 Adaptor for mounting temperature sensitive duty cycling control with flexible duct work Jul. 13, 1993
5092518 Hot-air type heater Mar. 3, 1992
4896828 Solid state emergency heat circuit Jan. 30, 1990
4887767 Limit switch control method for a two-stage furnace Dec. 19, 1989
4817862 Control apparatus Apr. 4, 1989
4712733 Internally mounted duty cycling control Dec. 15, 1987
4706881 Self-correcting microprocessor control system and method for a furnace Nov. 17, 1987
4698574 Process control apparatus Oct. 6, 1987
4676433 Regulating means for controlling the supply of heat to a confined space, and means for establishing when the heating requirement of an air mass exceeds a pre-determined value, and by how much Jun. 30, 1987
4667874 Energy saving furnace controller May. 26, 1987
4664311 Mounting for duty cycle control switch for ceiling mounted ductless heater May. 12, 1987
4646962 Rotational means for automatic damper means Mar. 3, 1987
4638942 Adaptive microprocessor control system and method for providing high and low heating modes in a furnace Jan. 27, 1987
4632303 Electronic thermostat with switched power converter Dec. 30, 1986
4629113 Furnace controller Dec. 16, 1986
4541561 Heating equipment and method of operating same Sep. 17, 1985
4477019 Flue gas heat recovery apparatus for a forced air home heating system Oct. 16, 1984
4470542 Single closed loop fireplace home heating system Sep. 11, 1984
4424934 Hot water heating system Jan. 10, 1984
4421268 Integrated control system using a microprocessor Dec. 20, 1983
4417688 Temperature control system for vehicle passenger compartment Nov. 29, 1983
4410131 Heating and air conditioning system Oct. 18, 1983
4401261 Flue gas heat recovery apparatus Aug. 30, 1983
4383640 Heat control device for a wood or coal burning stove May. 17, 1983
4382543 Acoustic control for zone heat control system May. 10, 1983
4373662 Integrated control system using a microprocessor Feb. 15, 1983
4337893 Multi-phase modular comfort controlled heating system Jul. 6, 1982
4308990 Flue gas heat recovery system Jan. 5, 1982
4240579 Thermostatically controlled heating system Dec. 23, 1980
4132353 Window heaters Jan. 2, 1979

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