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 [Search a list of Patent Appplications for class 236]   CLASS 236,AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION
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SECTION I - CLASS DEFINITION

This class relates only to automatic temperature and humidity regulation, and is not to include the system where the thermostatic control constitutes but an element of the system, even though the system includes temperature regulation, such, for example, as refrigeration, where the refrigerating structure or method is claimed. Systems are also excluded where the specific burner structure, specific boiler structure, specific heat-exchange element, specific fire extinguishing structure, specific heat distributing system, specific internal-combustion engine structure, specific furnace structure, specific gas producer structure or method, specific heating and molding devices, etc., are claimed--that is, this class is confined to automatically operating temperature or humidity controlling mechanism, but excludes all patents to the specific mechanism controlled, even though the thermostat is claimed, either broadly or specifically, in combination therewith.

(1) Note. This class includes only patents for devices which control temperature or humidity automatically, but not those which are merely operated by temperature variation. The only apparent exceptions are the heating radiator thermostatic air relief valves, the thermostatic steam traps and thermostatically operated regulating valves.
(2) Note. This class provides for all heating radiator automatic air relief valves including a thermostat.
(3) Note. This class provides for all automatic steam traps including a thermostat in the combination.
(4) Note. Patents for devices for controlling the flow of air over an automobile radiator by means of a thermostat located either in the cooling water or under the hood are classified in this class unless some novelty in the engine or cooling system is claimed.

SECTION II - REFERENCES TO OTHER CLASSES

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34Drying and Gas or Vapor Contact With Solids,   subclasses 524+ for automatic control of such apparatus, including temperature and humidity regulation for such specific apparatus.
62Refrigeration,   subclasses 132+ for automatically controlled apparatus specialized to refrigeration.
65Glass Manufacturing,   subclass 162 for temperature or heater control responsive to a condition sensing means combined with glassworking or treating apparatus.
73Measuring and Testing,   subclasses 29.02+ for hygrometers and hygrostats.
116Signals and Indicators,   subclasses 101+ for thermostatically controlled nonelectric alarms.
122Liquid Heaters and Vaporizers,   subclasses 451.1+ for devices for automatically controlling the feed water to a boiler by means of a thermostat and according to the level of the water in the boiler, 504.1 and 504.3 for fusible plugs where a pressure is released on the plug fusing at a certain temperature and 504.2 for devices where a thermostat operates on a fall of boiler water level to open a valve to sound an alarm.
123Internal-Combustion Engines,   appropriate subclasses for devices for automatically controlling the flow (or supply) of air to the manifold of an internal-combustion engine according to the temperature of the engine or manifold.
131Tobacco,   subclass 303 for processes and apparatus for treating tobacco with fluids combined with means for automatically regulating the temperature and/or humidity of the fluids.
137Fluid Handling,   appropriate subclass for fluid handling apparatus and processes not otherwise provided for, including automatic control of fluid flow in response to a change in a condition. Note particularly subclasses 59+ , 72+, 79+, 457, and 468 for the control of flow in response to a change in thermal conditions.
165Heat Exchange,   subclasses 201+ for specific heating and cooling elements with automatic control, and subclasses 281+; 287+ for specific heat exchange elements with automatic temperature or pressure control or response.
169Fire Extinguishers,   subclass 42 for fusible links of general application.
261Gas and Liquid Contact Apparatus,   subclass 39 for fuel or air valves in carburetors thermostatically operated.
323Electricity: Power Supply or Regulation Systems,   subclasses 220 through 354for voltage or current regulators.
337Electricity: Electrothermally or Thermally Actuated Switches,   subclasses 298+ for thermostatic switches.
340Communications: Electrical,   subclasses 584+ for electrical alarms automatically responsive to temperature, and subclass 602 for electrical alarms automatically responsive to humidity.
374Thermal Measuring and Testing,   subclasses 100+ for a thermometer.
399Electrophotography,   subclasses 91+ for internal machine environment control of an electrophotographic device.
431Combustion,   subclasses 18+ for (1) a residual specific burner with a timer, programmer, or condition responsive control; or (2) for a residual temperature modifying apparatus specialized to combustion having a nonspecific burner that is merely turned off and on by a conventional off and on thermostat sensing the temperature of the chamber or material being heated.

SUBCLASSES

[List of Patents for class 236 subclass 1]    1MISCELLANEOUS:
 This subclass is indented under the class definition.  Subject matter not provided for in any of the following subclasses.
  
[List of Patents for class 236 subclass 2]    2INCUBATOR TYPE OF HEATER:
 This subclass is indented under the class definition.  Subject matter for incubators.

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119Animal Husbandry,   subclasses 314 , 317, 319, for such devices having particular incubator structure.
237Heating Systems,   subclasses 3+ for the same with specific heating systems.
  
[List of Patents for class 236 subclass 3]    3Electric:
 This subclass is indented under subclass 2.  Subject matter in which the controlling means is electrically operated.

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74+,for the type of operating apparatus used.
  
[List of Patents for class 236 subclass 4]    4Expanding fluid:
 This subclass is indented under subclass 2.  Subject matter in which the regulating means is operated directly by a thermostat of the expanding-fluid type.
  
[List of Patents for class 236 subclass 5]    5Expanding solid:
 This subclass is indented under subclass 2.  Subject matter in which the regulating means is operated directly by a thermostat of the expanding solid type.
  
[List of Patents for class 236 subclass 6]    6BROODER TYPE OF HEATER:
 This subclass is indented under the class definition.  Subject matter for brooder type of heaters not otherwise classifiable.

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119Animal Husbandry,   subclass 306 for such devices having particular brooder structure. See (1) note to that subclass definition.
237Heating Systems,   subclasses 3+ for the same with specific heating system.
  
[List of Patents for class 236 subclass 7]    7SADIRON TYPE:
 This subclass is indented under the class definition.  Subject matter for self-heated sad-irons not otherwise classifiable.

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38Textiles: Ironing and Smoothing,   subclasses 82+ for such devices having particular iron structure.
219Electric Heating,   subclasses 490+ for heating systems of general utility with automatic control means, and appropriate subclasses for specific type electrical heating devices with automatic current, voltage or temperature control means.
  
[List of Patents for class 236 subclass 8]    8ATOMIZER TYPE OF BURNER:
 This subclass is indented under the class definition.  Devices controlling the flow of steam or air and fuel to an atomizer type of burner, according to changes in pressure or temperature in the device heated.

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26+,for controlling devices responsive to pressure changes in the closed fluid heater.
  
[List of Patents for class 236 subclass 9]    9COMBINED HEATER AND APARTMENT CONTROLLED:
 This subclass is indented under the class definition.  Subject matter which are operated by devices responsive to temperature changes in a heater and also temperature changes in an apartment to be heated.

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37,for control by radiator temperature and apartment temperature.
91,for other controls responsive to temperatures at different places.
  
[List of Patents for class 236 subclass 10]    10HOT-AIR FURNACE:
 This subclass is indented under the class definition.  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.
  
[List of Patents for class 236 subclass 11]    11Air and fire control:
 This subclass is indented under subclass 10.  Subject matter in which the fire and also the flow of the heating air through the air chamber of the furnace is controlled.
  
[List of Patents for class 236 subclass 12.1]    12.1MIXING FLUID OF DISSIMILAR TEMPERATURE:
 This subclass is indented under the class definition.  Apparatus mixing fluid from two or more different supplies in which at least one of the supplies of the fluid is controlled according to the temperature of the mixed fluid or the temperature of one of the fluid supplies.
  
[List of Patents for class 236 subclass 12.11]    12.11Mixing valve with temperature controlled motive means:
 This subclass is indented under subclass 12.1.  Apparatus comprising flow control means positively moved to an adjusted position by a motor means wherein the motor means is moved to the adjusted position by a medium or force controlled by but not resulting directly from a sensed temperature condition or a change in such a condition.
(1) Note. Examples of motors to be found herein are electric motors controlled by thermostatic switches, fluid motors with independent sources of fluid pressure where a thermal responsive valve senses a system conditions and regulates fluid flow from said source to motor.
(2) Note. A valve merely moved by a heat motor which directly senses a system condition and responds to move a valve, e.g., bimetal, closed fluid system with sensing bulb, etc., will not be found herein.
  
[List of Patents for class 236 subclass 12.12]    12.12Having electrical motive means:
 This subclass is indented under subclass 12.11.  Apparatus comprising a motor means responding to electrical energy input for moving the flow control means.
  
[List of Patents for class 236 subclass 12.13]    12.13Including bypass:
 This subclass is indented under subclass 12.1.  Apparatus in which the device is provided with separate controllable through passages, leading from a source of fluid, at least one of the passages having a valving means permitting said fluid to pass directly to a point of use, regardless of the temperature existing in the system, and at least one other passage being provided with means for controlling the flow of said fluid in response to a temperature condition or a change in temperature occurring at some point in the apparatus.
  
[List of Patents for class 236 subclass 12.14]    12.14Fluid from only one supply is controlled:
 This subclass is indented under subclass 12.1.  Apparatus in which the flow of only one of the supplies is controlled by the sensed temperature condition of the mix.
  
[List of Patents for class 236 subclass 12.15]    12.15Including separate relatively movable valve for each fluid supply:
 This subclass is indented under subclass 12.1.  Apparatus wherein the flow of each supply is controlled by a separate flow control member movable in response to fluid temperature.
(1) Note. Each member may be movable in response to the temperature of either a respective fluid or a fluid mix.
  
[List of Patents for class 236 subclass 12.16]    12.16Having oscillating or reciprocating valve:
 This subclass is indented under subclass 12.1.  Apparatus wherein a flow control means moves in a prescribed straight line or arcuate path of travel to control fluid flow.
  
[List of Patents for class 236 subclass 12.17]    12.17Valving member moves about an axis:
 This subclass is indented under subclass 12.16.  Apparatus wherein the flow control means comprises a flow control portion movable in an arcuate path of travel.
  
[List of Patents for class 236 subclass 12.18]    12.18Tubular valve member:
 This subclass is indented under subclass 12.17.  Apparatus wherein the flow control means comprises a hollow sleeve or cylinder like member or portion.
(1) Note. A cup shape flow control means is proper for classification here if the sleeve or cylinder portion performs a flow control function. Otherwise classification will be based on other features.
  
[List of Patents for class 236 subclass 12.19]    12.19Axially spaced flow faces:
 This subclass is indented under subclass 12.17.  Apparatus wherein the flow control means comprises a member having a seating face at each of its sides for coacting with seats on oppositely disposed fluid inlets.
  
[List of Patents for class 236 subclass 12.2]    12.2Tubular valve member:
 This subclass is indented under subclass 12.16.  Apparatus wherein the flow control means comprises a hollow sleeve or cylinder-like member or portion.
  
[List of Patents for class 236 subclass 12.21]    12.21Axially spaced flow control faces:
 This subclass is indented under subclass 12.16.  Apparatus wherein the flow control means comprises a movable valving member having a seating face at each end for coacting with seats on oppositely disposed fluid inlets.
  
[List of Patents for class 236 subclass 12.22]    12.22Seats face outwardly:
 This subclass is indented under subclass 12.21.  Apparatus wherein the seating faces on the member are directed away from each other.
  
[List of Patents for class 236 subclass 12.23]    12.23Ports closed by valve action:
 This subclass is indented under subclass 12.16.  Apparatus wherein the movable flow control means moves to and from contiguously along a surface having fluid ports therein for controlling fluid passing therethrough.
  
[List of Patents for class 236 subclass 13]    13Plenum type:
 This subclass is indented under subclass 12.1.  Devices controlling the mixing of warm and cold air in the plenum type of heating systems according to the temperature of the hot or cold air, mixed air, or apartment to be heated.
  
[List of Patents for class 236 subclass 14]    14COMBINED BOILER AND FURNACE CONTROLLED:
 This subclass is indented under the class definition.  Devices controlling the fire under a boiler according to conditions in the boiler and also according to conditions in the furnace.

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15,for devices responsive to changes within the furnace.
20+,for control devices operated by changes in the boilers.
  
[List of Patents for class 236 subclass 15]    15FURNACE CONTROLLED:
 This subclass is indented under the class definition.  Devices controlling the fire according to conditions in the furnace.

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14,for controls responsive to boiler and furnace.
95,96, for furnace control where the thermostat is attached to the outside of the heater or flue.
104,for furnace controls operated by the expansion or contractions of the furnace parts due to temperature changes.
  
[List of Patents for class 236 subclass 16]    16COMBINED DRAFT AND CHECK CONTROL:
 This subclass is indented under the class definition.  Devices controlling the draft damper and check damper of a stove or furnace according to changes in the temperature of apartment or element heated.
  
[List of Patents for class 236 subclass 17]    17Pressure-operated:
 This subclass is indented under the class definition.  Devices controlling the supply of heating fluid to an exchange or surface heater by the pressure of the fluid heated.

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14,for the same combined with furnace control.
26+,for pressure operated closed fluid heater control.
85,for the control, per se.
  
[List of Patents for class 236 subclass 18]    18Expanding fluid:
 This subclass is indented under the class definition.  Devices controlling the supply of heating fluid to an exchange or surface heater directly by means of a thermostat of the expanding fluid type responsive to the temperature of the fluid heated.

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4,42, 56+, 64, 95, and 99, for the type of thermostat used and control devices operated thereby.
32,for closed fluid heaters with similar controls.
93,for devices where flow is regulated by the temperature of the flowing fluid.
  
[List of Patents for class 236 subclass 19]    19Expanding solid:
 This subclass is indented under the class definition.  Devices controlling the supply of heating fluid to an exchange or surface heater directly by means of a thermostat of the expanding solid type responsive to the temperature of the fluid heater.

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5,43, 59+, 66, 96, and 101, for the type of thermostat used and control devices operated thereby.
33,for closed fluid heaters with similar controls.
93,for devices where flow is regulated by the temperature of the flowing fluid.
  
[List of Patents for class 236 subclass 20]    20CLOSED FLUID HEATERS:
 This subclass is indented under the class definition.  Devices controlling the temperature of the fluid heated.
  
[List of Patents for class 236 subclass 21]    21Safety cut-out:
 This subclass is indented under subclass 20.  Devices controlling the heating means according to the conditions in the heater, with additional means for cutting out the regulating means under abnormal conditions, such as failure of the regulator, (as by rupture of the diaphragm, for example), the pressure exceeding a certain limit, the water-level falling below a certain limit, the temperature getting too high, or heating means failing.
(1) Note. The regulator must generally be repaired or reset by hand.

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89,for magnetic trip release controls with cut-out features.

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137Fluid Handling,   subclasses 59+ , 72+, 79+, 457, and 468 for thermally responsive valves in general.
  
[List of Patents for class 236 subclass 22]    22Radiator type:
 This subclass is indented under subclass 20.  Combined radiators and heaters where the heater is controlled according to the temperature of the radiator.

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26+,for heaters controlled by the pressure in the radiator.
32,33, for heaters controlled by a thermostat.

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237Heating Systems,   subclass 7 for systems where the unit is specifically claimed.
  
[List of Patents for class 236 subclass 23]    23One valve:
 This subclass is indented under subclass 20.  Devices in which the heating means, usually a gas-burner, is controlled by the combined action of a thermostat in the fluid heated and a flow-motor operated by the flow of the fluid heated, the thermostat and motor controlling the movement of a single control-valve.
  
[List of Patents for class 236 subclass 24]    24Two or more valves:
 This subclass is indented under subclass 20.  Devices in which the heating means, usually a gas-burner, is controlled by the combined action of a thermostat in the fluid heated and a flow-motor operated by the flow of the fluid heated, the thermostat and motor operating on separate valves.
  
[List of Patents for class 236 subclass 24.5]    24.5Flow and pressure controlled:
 This subclass is indented under subclass 20.  Devices in which the combined dynamic and static pressure of the fluid heated controls the heating means, and those in which this combined force is opposed by one of its elements alone or by a different combination of them.
  
[List of Patents for class 236 subclass 25]    25Flow controlled:
 This subclass is indented under subclass 20.  Devices in which the heating means is controlled according to the rate of flow of the fluid heated.

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23,24, 24.5, and 45, for other temperature or humidity regulators comprising flow control of the regulator.

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137Fluid Handling,   subclasses 98+ , 458 to 460, 486+, 496, and 497+ for valves responsive to change in rate of flow.
  
[List of Patents for class 236 subclass 26]    26Pressure-operated:
 This subclass is indented under subclass 20.  Devices not otherwise classifiable controlling the heating of the closed fluid-heater according to the pressure in the heater.

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8,14, 17, and 85, for other pressure operated controls.
  
[List of Patents for class 236 subclass 27]    27With balancing pressure chamber:
 This subclass is indented under subclass 26.  Devices where the effect of the heater-pressure is counterbalanced by a closed pressure-chamber.
  
[List of Patents for class 236 subclass 28]    28Stroke retarding:
 This subclass is indented under subclass 26.  Devices with means for increasing the resistance to movement of a control element as movement from normal increases.
  
[List of Patents for class 236 subclass 29]    29Relay, puppet:
 This subclass is indented under subclass 26.  Devices in which at a given pressure a puppet-valve opens, allowing pressure from the boiler to operate a motor, which actuates the heat-controlling means.
  
[List of Patents for class 236 subclass 30]    30Bourdon type:
 This subclass is indented under subclass 26.  Devices in which the pressure-responsive element which operates the controlling means is a Bourdon tube.
  
[List of Patents for class 236 subclass 31]    31Float:
 This subclass is indented under subclass 26.  Devices in which the pressure acts on a body of liquid, thereby varying the level thereof, and a float or piston rising and falling with the change in level of the liquid operates the controlling means. Also includes devices where a float is raised more or less by change in pressure of steam thereunder when water boils.

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100,for other float responsive devices.
  
[List of Patents for class 236 subclass 32]    32Expanding fluid:
 This subclass is indented under subclass 20.  Devices controlling the heating means directly by a thermostat of the expanding-fluid type responsive to the temperature of the fluid heated.

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4,42, 56+, 64, 86, 95, and 99, for the type of thermostat used and devices operated thereby.
18,for similar structure in exchange heaters.
  
[List of Patents for class 236 subclass 33]    33Expanding solid:
 This subclass is indented under subclass 20.  Devices controlling the heating means directly by a thermostat of the expanding-solid type responsive to the temperature of the fluid heated. The thermostat may be the walls of the container.

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5,19, 43, 59+, 66, 87, 96, and 101+, for the type of thermostat used and devices operated thereby.
  
[List of Patents for class 236 subclass 34]    34COOLING RADIATOR:
 This subclass is indented under the class definition.  Devices not otherwise classified controlling the temperature of the fluid within a cooling-radiator, as the radiator in the cooling system of an internal-combustion engine.

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123Internal-Combustion Engines,   subclasses 41.02+ for specific cooling systems peculiar to internal-combustion engines.
  
[List of Patents for class 236 subclass 34.5]    34.5Bypass:
 This subclass is indented under subclass 34.  Subject matter in which a by pass is interposed in the cooling circuit to by pass the radiator, usually including a thermostatically operated valve responsive to the temperature of the coolant or engine and positioned in the circuit to direct the flow of the coolant either to the radiator or the by pass.
  
[List of Patents for class 236 subclass 35]    35Air control:
 This subclass is indented under subclass 34.  Devices controlling the flow of air over the radiator according to the temperature of the fluid cooled or the cooling-air or the engine temperature.

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123Internal-Combustion Engines,   subclasses 41.04+ and 41.11+ for shutter and impeller controls associated with engine cooling.
165Heat Exchange,   subclass 98 for radiator with means controlling the flow of air therethrough not automatically controlled, and subclasses 281+; 287+ for a heat exchanger having automatic temperature or pressure control.
  
[List of Patents for class 236 subclass 35.2]    35.2Shutters:
 This subclass is indented under subclass 35.  Subject matter in which the means for controlling the air flow is shutters.
  
[List of Patents for class 236 subclass 35.3]    35.3Servomotor:
 This subclass is indented under subclass 35.  Subject matter in which the means for operating the shutters includes a servo-motor.
  
[List of Patents for class 236 subclass 36]    36HEATING RADIATOR:
 This subclass is indented under the class definition.  Devices not otherwise classified controlling the supply of heating fluid to a heating-radiator.
  
[List of Patents for class 236 subclass 37]    37Combined radiator and apartment controlled:
 This subclass is indented under subclass 36.  Devices responsive to conditions in the radiator and temperature of the apartment heated thereby.

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9,for systems in which the temperature of a heater and of the apartment controls the regulation.
91,for controls responsive to temperatures at different places.
  
[List of Patents for class 236 subclass 38]    38Air control:
 This subclass is indented under subclass 36.  Means regulating the flow of air over the radiator according to temperature changes in the radiator, the air heated, or the apartment to be heated.

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13,for similar structure in fluid mixers.
  
[List of Patents for class 236 subclass 39]    39Aspirator:
 This subclass is indented under subclass 36.  Heating-radiators with means for exhausting the air therefrom in which the heating effect of the radiator is controlled by a fluid-motor operated by said exhaust, the connection between the exhaust and the motor being controlled by a thermostat.

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54,for steam traps incorporating a pressure motor and a thermostatic pilot therefor.
  
[List of Patents for class 236 subclass 40]    40Thermostatic:
 This subclass is indented under subclass 36.  Heating-radiators provided with a thermostat subjected to the exhaust from the radiator and controlling the supply of heating fluid to the radiator.
  
[List of Patents for class 236 subclass 41]    41With trap:
 This subclass is indented under subclass 40.  Subject matter in combination with an automatic trap for discharging the air and water of condensation.

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53,through 60, under "Traps", for the specific automatic trap construction.
53+,for steam traps with float valve and thermostatically controlled air vent valve.
  
[List of Patents for class 236 subclass 42]    42Expanding fluid:
 This subclass is indented under subclass 36.  Heating-radiators with a thermostat of the expanding-fluid type for directly regulating the supply of heating fluid to the radiator.

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4,18, 32, 56+, 64, 86, and 99, for the type of thermostat used and controlling devices operated thereby.
40+,for similar devices exhaust operated.
  
[List of Patents for class 236 subclass 43]    43Expanding solid:
 This subclass is indented under subclass 36.  Heating-radiators with a thermostat of the expanding solid type for directly regulating the supply of heating fluid to the radiator.
(1) Note. This also includes devices operated by the expansion of the radiator.

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5,19, 33, 59+, 66, 87, 96, and 101+, for the type of thermostat and controlling devices operated thereby.
  
[List of Patents for class 236 subclass 44]    44HUMIDITY CONTROL:
 This subclass is indented under the class definition.  Devices controlling the humidity of a room or apartment by means of a device responsive to the relative humidity therein.

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165Heat Exchange,   subclasses 282 ; 283; 294; 296; and 297 for a heating and cooling system having humidity control.
261Gas and Liquid Contact Apparatus,   subclasses 129+ for temperature or humidity controlled gas liquid contactors having heating or cooling means.
  
[List of Patents for class 236 subclass 45]    45DRAFT-OPERATED:
 This subclass is indented under the class definition.  Devices controlling the operation of a heater according to the draft.

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137Fluid Handling,   subclasses 98+ , 458 to 460, 486+, 496, and 497+ for valves responsive to change in rate of flow.
  
[List of Patents for class 236 subclass 46]    46WITH TIMING ELEMENT:
 This subclass is indented under the class definition.  Devices in which a clock is employed for adjusting the regulating device at a given time or where the clock cuts in or cuts out the regulating device; also devices with timing means for periodically placing the regulating means into and out of operation.

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110Furnaces,   subclass 192 for a refuse incinerator or solid fuel furnace provided with a timer control.
  
[List of Patents for class 236 subclass 47]    47HIGH AND LOW TEMPERATURE ALTERNATE:
 This subclass is indented under the class definition.  Devices controlling the temperature by two different devices alternately, one set to maintain the temperature relatively high and the other relatively low.

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46,for clock controlled regulators that may be operated to maintain different temperatures at different times.
  
[List of Patents for class 236 subclass 48]    48SNAP-ACTING:
 This subclass is indented under the class definition.  Devices in which the temperature control valve does not move on slight changes in temperature, but its operating force is stored up during a certain movement of the temperature responsive device, and then the valve (or controlling means) suddenly moves throughout its entire movement not provided for more specifically below.

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81,83, for such devices incorporating a fluid motor which is relay operated.

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74Machine Element or Mechanism,   subclasses 100.1+ for snap action devices associated with mechanism for converting reciprocating motion to or from oscillating motion.
  
[List of Patents for class 236 subclass 49.1]