Class Definition for Class 165

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CLASS 165,	HEAT EXCHANGE
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SECTION I - CLASS DEFINITION

This class includes apparatus or process not provided for in other classes for transferring heat, or apparatus or process not provided for in other classes relating to an auxiliary device particularly adapted to be used with such heat transfer apparatus.

(1) Note. A patent including a claim having nominal recitation of structure external to this class in combination with significantly claimed heat transfer apparatus of this class is included in this class. A patent including a claim having significant recitation of structure external to this class is excluded from this class unless specifically provided for in this class. See Subclass References to the Current Class, below, for a subclass reference for a combination of a vehicle structure and significantly claimed heat transfer apparatus, and for a combination of a building structure and significantly claimed heat transfer apparatus.

(2) Note. Method of repairing, making, or assembling a heat exchanger is not provided in this class but is classified in an appropriate manufacturing class.

(3) Note. Any process claim appropriate for this class are classified in the subclass providing for structure used in the process.

SECTION II - SUBCLASS REFERENCES TO THE CURRENT CLASS

SEE OR SEARCH THIS CLASS, SUBCLASS:

3,	for heating and cooling including addition or removal of water vapor from air.
41+,	for a combination of a vehicle structure and significantly claimed heat transfer apparatus.
47+,	for a combination of a building structure and significantly claimed heat transfer apparatus.
58,	and 200, see note for the line between Classes 62 and 165.
58+,	for a heating and cooling system with an ancillary separator.
200,	see "note" for the line between Class 165 and related art.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

34,	Drying and Gas or Vapor Contact With Solids, appropriate subclasses. See Lines With Other Classes and Within This Class in the class definition of Class 34 for the line.
62,	Refrigeration, appropriate subclasses, for processes limited to refrigeration and apparatus having features specialized to refrigeration. In general if the heat exchanging means is such that it is adapted for interchangeably or convertibly heating or cooling it is not specialized to refrigeration. For example, features such as ice supports, material phase changing means (refrigeration producers), atmospheric condensate handling or an article handler with means peculiar to refrigerating the article would be considered specialized to refrigeration. As to structure adapted to both heat and cool, see Subclass References to the Current Class in this class (165). See Subclass References to the Current Class for a subclass reference to the the line between Classes 62 and 165.
65,	Glass Manufacturing, subclasses 512+ for specialized cooling of newly formed glass fibers or filaments; subclasses 509+ for specialized heating of newly formed glass fibers or filaments; subclasses 348+ for means specialized to the cooling of manufactured glass products; subclasses 484+ for means specialized to exchange heat in a fiber or filament forming operation and appropriate subclasses for processes or means specialized to the application of or removal of heat in glass manufacturing.
95,	Gas Separation: Processes, for processes of gas separation including heat exchange. Cold wall-hot wall thermal diffusion processes will be found in Class 95, subclass 289 . Class 165 will take processes where only indirect heat exchange is involved, whether or not gas separation is said to occur. See Subclass References to the Current Class in this class (165) for a subclass reference for heating and cooling including addition or removal of water vapor from air.
96,	Gas Separation: Apparatus, for apparatus for gas separation including a heat exchanger. Cold wall-hot wall thermal diffusion apparatus will be found in Class 96, subclass 221 . Class 165 will take apparatus where only indirect heat exchange is involved, whether or not gas separation is said to occur. See Subclass References to the Current Class in this class (165) for a heating and cooling system with an ancillary separator.
99,	Foods and Beverages: Apparatus, appropriate subclasses for food treating apparatus having heating or cooling means combined with additional apparatus specialized to food.
100,	Presses, subclasses 92+ for presses means to heat, cool or dry the material.
122,	Liquid Heaters and Vaporizers, subclasses 32+ for an indirectly heated closed liquid container with an internal vapor separator, and appropriate subclasses for a closed liquid heating vessel with a heat generator and for an accessory or element that of necessity must form a part of the liquid heating combination.
126,	Stoves and Furnaces, subclass 33 for a stove with a steam table; subclasses 204+ for a body warmer: subclasses 226+ for a tool heater; subclass 247 for a frictional heater; subclasses 263.01+ for a chemical reaction type heater; subclasses 561+, 569+ and 714 for a solar heater; subclass 343.5 for a melting furnace; and appropriate subclasses, for open liquid heating structures not equally adapted for cooling, for heating stoves, for means for the application of heat for house warming and cooking purposes, and for specialized accessories and elements of such means.
137,	Fluid Handling, subclasses 334+ particularly subclass 340 for fluid handling apparatus combined with means to heat or cool a part of the system or its contents by a heat exchange.
138,	Pipes and Tubular Conduits, subclasses 37+ for general utility pipe having flow regulator or baffle.
159,	Concentrating Evaporators, appropriate subclasses, for means for the generation and transfer of heat of the specific purpose of concentration by evaporation.
196,	Mineral Oils: Apparatus, subclasses 104+ for a still designed for mineral oil distillation and subclasses 138+ for condensing peculiarly adapted and limited to the mineral oil art.
202,	Distillation: Apparatus, subclasses 163+ and 232+ for apparatus for volatilizing a substance for the purpose of recovering material from the vapor by condensation or absorption.
203,	Distillation: Processes, Separatory, subclasses 41 and 42, for a process of volatilizing a substance and recovering material from the vapor by some type of sorption.
210,	Liquid Purification or Separation, subclasses 175+ , 612+, 664, 737, 742, 766, and 774 for processes and apparatus of that class with heat or heat exchange.
219,	Electric Heating, appropriate subclasses for an electric heater or an electrically heated tool.
221,	Article Dispensing, subclass 150 for subject matter of that class with cooling or heating.
222,	Dispensing, subclass 146 for dispensers with heating or cooling means.
236,	Automatic Temperature and Humidity Regulation, subclass 44 for automatic humidity controlling mechanism; subclass 46 for temperature or a humidity controlling mechanism including a timing means; and appropriate subclasses for a temperature or humidity control mechanism for a control of general utility. The line between Class 165 and 236 is: Class 165 takes: (a) Nominal recitation of a means for heating and cooling, and a means for automatically controlling the means for heating and cooling. (b) Specific heat exchanger structure in combination with a means for automatically controlling a heat exchanger. (c) Specific heat exchange structure in combination with a means for automatically controlling a heating and a cooling means. Class 236 takes: A patent with nominal recitation of a heat exchanger in combination with a means for automatically controlling a heating or cooling means.
237,	Heating Systems, subclasses 70+ for a heat distributing means peculiarly adapted for heating, and appropriate subclasses for (1) a heat producer combined with means for distributing a fluid heated thereby and (2) apparatus including systems for heating a room, chamber, house or other inclosing structure when such apparatus is not equally adapted for cooling. See Subclass References to the Current Class for a subclass reference to the line between Classes 237 and 165.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 13 and 128+ for processes and apparatus of that class with heating or cooling.
241,	Solid Material Comminution or Disintegration, subclasses 23 and 65+ for processes and apparatus of that class with heating or cooling.
252,	Compositions, particularly subclasses 67+ and 71+. Patents are placed in Class 252 (1) claiming admixtures of ingredients, or claims to an old compound limited to use as a heat exchange agent, (2) processes of heat exchange comprising known heat exchange steps broadly recited and distinguished solely by the composition or compound used, and (3) apparatus with the composition or compound therein, where characteristics of apparatus structure are not claimed. The preceding are placed in Class 252 even though freezing or boiling points or temperatures of use are specified.
261,	Gas and Liquid Contact Apparatus, appropriate subclasses for apparatus specially adapted to produce an intimate contact between gases and liquids to exchange properties or mutually modify conditions; particularly, subclasses 127+ for a gas liquid contact device with an immediately associated means for externally supplying heat to or removing it from a contact fluid before, after or during contact to perfect the contact operation; and subclasses 158+ for a contact device in which heat is interchanged between contact fluids out of contact before, after or during contact.
291,	Track Sanders, subclasses 19+ for subject matter of that class with a heater.
312,	Supports: Cabinet Structure, subclass 236 for the combination of a cabinet and a heater or heat exchanger, having no feature relating to the promotion or control of the flow of the fluid in the cabinet relative to the heat exchanger.
366,	Agitating, appropriate subclasses for agitating process or apparatus of general utility; subclasses 144+ for an agitator in combination with a heating or cooling means. The line between Classes 165 and 366 on combined agitator and heat exchanger is: Class 165 takes: (a) All patents with significant heat exchange structure in combination with nominal structural recitation of an agitator. (b) All patents with a heat exchanger having an agitator which operates on a working fluid (e.g., a coolant or heating fluid), whether or not the agitator structure is broadly or significantly claimed. (c) All patents with a heat exchanger having a working fluid (e.g., a coolant or heating fluid) which goes through the inside of a movable portion of an agitator, whether or not the agitator structure is broadly or significantly claimed Exception to the above statements (b) and (c): Patents in which a working fluid is agitated by an agitator and then allowed to be mixed in a mixing chamber containing a material or fluid to be treated ( heated or cooled) are classified in Class 366. Class 366 takes: (a) Significant agitator structure in combination with significant structure of a heat exchanger. (b) Significant agitator structure in combination with nominal structure of a heat exchanger. Exception to the above statements (a) and (b): A patent with a heat exchanger having a working fluid (a coolant or heating fluid) which goes through the inside of a movable portion of an agitator is classified in Class 165, whether the agitator structure is significantly or broadly claimed. Class 366 takes a heat exchanger having an agitator which operates on a working fluid only if the working fluid is then allowed to flow into a mixing chamber containing a material or fluid to be heated or cooled.
373,	Industrial Electric Heating Furnaces, appropriate subclasses for electrical furnaces.
376,	Induced Nuclear Reactions: Processes, Systems, and Elements, subclasses 210+ , 298+, 322, 378+, and 402+, for heat exchange devices used in combination with nuclear reaction systems.
383,	Flexible Bags, for hot water and ice bags, per se.
422,	Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, subclass 305 for fume generators.
426,	Food or Edible Material: Processes, Compositions, and Products, appropriate subclasses.
432,	Heating, appropriate subclass, for a residual material heating apparatus or method.
454,	Ventilation, appropriate subclasses for apparatus for supplying air to, removing it from, or distributing in an enclosure with or without heating and without a specific heat exchange means.

SUBCLASSES

[List of Patents for class 165 subclass 4]

REGENERATOR:

This subclass is indented under the class definition. Apparatus comprising a non-fluent heat storing mass that in alternation has heat added to it by one fluid stream and removed from it by another.

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104.11+,

for a fluent material forming part of the heat transfer apparatus that recycles between two zones picking up heat at one zone and discharging it at another.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclasses 638 , 641 for a process specialized to liquid gas production utilizing a regenerator and subclasses 644+ for a liquefied gas producer having a gas treater upstream of a rectifier that may be of the regenerative type.
137,	Fluid Handling, subclasses 309+ for a regenerative system consisting of reversing valves and only the fluid passages of the regenerator.
202,	Distillation: Apparatus, subclass 123 , for a vertical thermolytic retort with a regenerator and subclasses 141+, for a horizontal thermolytic retort having vertical flues and reversible regenerators.
432,	Heating, subclass 39 , for the automatic control of the selection or load balancing of furnace exhaust heated regenerators; 40, for the automatic control of a Cowper stove; 54, for residual heating apparatus with an interlocked, interconnected or multiway controller alternating flow of heated and heating fluid; 70, for residual heating apparatus with a slag or dust separator at a regenerator or recuperator; and 80 for a residual furnace in which the work chamber exhaust heats the work chamber feed by a regenerative type heat exchanger.

5	Cleaning:
	This subclass is indented under subclass 4. Apparatus wherein provision is made for the cleaning of the heat storage mass.

6	Movable heat storage mass with enclosure:
	This subclass is indented under subclass 4. Apparatus wherein the heat storage mass is movable first into one of the fluid streams and then into another of the streams and there is an enclosing support for the mass with inlets and outlets for the exchanging streams.

7	With fluid handling system:
	This subclass is indented under subclass 6. Apparatus with fluid handling elements additional to the mass and its enclosing support.

8	Rotary heat collector:
	This subclass is indented under subclass 6. Apparatus in which the two streams pass through circumferentially spaced parts of the mass, which is rotatable.

[List of Patents for class 165 subclass 9]

Seals:

This subclass is indented under subclass 8. Apparatus having provisions for preventing leakage of the fluid flowing through the rotary mass.

SEE OR SEARCH CLASS:

285,	Pipe Joints or Couplings, subclasses 95+ for a coupling with a fluid pressure seal, and subclasses 335+ for a packed pipe joint.

[List of Patents for class 165 subclass 9.1]

9.1

Checker brick structure:

This subclass is indented under subclass 4. Apparatus comprising a heat storage mass made up of plural, shaped, modular units of refractory material arranged to form an openwork structure of interconnected passages; or a module, per se, if particularly adapted for use in such a mass.

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52,	Static Structures (e.g., Buildings), subclass 574 for an assembly of alternating, reversed identical form modules of general utility; subclasses 578+ for a general utility assembly of modules with a discrete edgewise connecting feature; and subclasses 596+ for a module of general utility having inter-relating structure.
202,	Distillation: Apparatus, subclasses 111 , 122, 123, 130, 140, 143, 144, 146, 148, and 267 for regenerative heating devices used in stills.
266,	Metallurgical Apparatus, subclass 139 for metallurgical apparatus provided with a gas heater of the heat storage type.
432,	Heating, subclass 28 for a process of utilizing or operating a heat storage mass; subclass 51 for the timing, programming or cycling control of heat storage masses; subclass 54, for the intercontrol of heated and heating fluid to a heat storage mass; subclass 70, for a heat storage mass having a lint, dust, or slag separator or collector; subclasses 180+ for a combustion products heated furnace in which the chamber exhaust heats the chamber feed by means of a heat storage mass; subclass 214, for a heat storage mass of solid material combined with a heat generator.

9.2	Gradated flow area, heat capacity or heat resistance:
	This subclass is indented under subclass 9.1. Apparatus in which the modular units are (1) arranged to form a flow passage increasing or decreasing in size along the assembly or (2) are formed of different material along the direction of flow providing progressive resistance to damage by heat or having progressive heat storing characteristics.

9.3	Having gas supply or exhaust manifold structure:
	This subclass is indented under subclass 9.1. Apparatus with means forming a distinct fluid distributing or collecting chamber at an end of the heat storage mass.

9.4	In casing:
	This subclass is indented under subclass 9.1. Apparatus in which the modular units are arranged in a gas confining shell.

10	Heat collector:
	This subclass is indented under subclass 4. Apparatus relating to the structure of the heat storing mass.

[List of Patents for class 165 subclass 11.1]

11.1

WITH ALARM, INDICATOR, SIGNAL REGISTER, RECORDER, TEST OR INSPECTION MEANS:

This subclass is indented under the class definition. Apparatus with an alarm, indicator, register, recorder, signal or tester; or with means which permits inspection of normally hidden parts of the apparatus or of the fluid inside the apparatus.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclasses 125+ for a refrigerating system with an indicator or tester.
73,	Measuring and Testing, appropriate subclasses for a measuring or testing device, per se.

11.2	Remotely controlled inspection means:
	This subclass is indented under subclass 11.1. Apparatus which the inspection means is manipulated from outside the heat exchanger by an operator.

[List of Patents for class 165 subclass 41]

WITH VEHICLE FEATURE:

This subclass is indented under the class definition. Apparatus having (1) means dependent on vehicle motion, (2) a defined vehicle traction feature, or (3) a defined vehicle body feature other than that merely forming the structure enclosing a space to be heated or cooled or supporting a heating or cooling means.

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202+,	and 271, for control means responsive to vehicle motion.
234+,	where the vehicle is an aircraft having means to compensate for variations in ambient pressure.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclasses 239+ for a vehicle having refrigerating apparatus not combined with heating apparatus.
152,	Resilient Tires and Wheels, subclass 153 for a resilient tire with a cooling device.
237,	Heating Systems, subclass 12.3 for a heating system not combined with a cooling system for a vehicle body in which the vehicle motor serves as the heat generator for the system; and subclasses 28+ for a vehicle having heating apparatus, but not cooling.

42	Heating and cooling:
	This subclass is indented under subclass 41. Apparatus having means for both heating and cooling that is more than a mere carrier for heat between a source and a sink.

[List of Patents for class 165 subclass 43]

Vehicle contained common power and heat supply:

This subclass is indented under subclass 42. Apparatus in which there is on the vehicle a common power supply for the vehicle and the cooling apparatus.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclass 243 for a refrigeration system installed on a vehicle with a common power supply for the vehicle and refrigerating system.
237,	Heating Systems, subclass 12.3 for a combined power plant and heating system for a vehicle other than a railway car and subclasses 12.4+ for a similar structure on a railway car.

[List of Patents for class 165 subclass 44]

Utilizing motion of vehicle:

This subclass is indented under subclass 41. Apparatus including means which makes use of the motion of a vehicle to perform some function of heat exchange.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclasses 241+ for a vehicle mounted refrigeration system utilizing the motion of the vehicle.

[List of Patents for class 165 subclass 45]

GEOGRAPHICAL:

This subclass is indented under the class definition. Apparatus wherein the structure is related to some feature of the earth.

SEE OR SEARCH CLASS:

60,	Power Plants, subclasses 641.1+ for a power plant utilizing natural heat.
62,	Refrigeration, subclass 260 for a refrigerating apparatus having a geographical feature.
126,	Stoves and Furnaces, subclasses 561+ , 569+ and 714, for a solar heater.
166,	Wells, subclasses 57+ for heat exchange apparatus comprising part of a well apparatus for producing or treating a well.
175,	Boring or Penetrating the Earth, subclass 17 for earth boring with means for changing the temperature of all or a portion of a bore or boring equipment within the bore.
299,	Mining or In Situ Disintegration of Hard Material, subclasses 3+ for in situ conversion of solid to fluid for recovery of valuable material and including melting or other use of heat.
405,	Hydraulic and Earth Engineering, subclass 56 for a method or apparatus relating to the heating or cooling of the earth surrounding an underground fluid storage cavity; and subclasses 130+ for subject matter relating to temperature modification of an earth formation.

[List of Patents for class 165 subclass 46]

FLEXIBLE ENVELOPE OR COVER TYPE:

This subclass is indented under the class definition. Apparatus comprising a nonrigid cover or applicator unit; e.g., sheet, bag, etc.

SEE OR SEARCH CLASS:

2,	Apparel, subclass 171.3 for a head covering with forced air circulator.
4,	Baths, Closets, Sinks, and Spittoons, subclasses 524+ for a device for treating the body or a body member with hot air or vapor.
5,	Beds, subclasses 421+ for beds or mattresses with heating or cooling means.
36,	Boots, Shoes, and Leggings, subclasses 83+ for a heated boot or shoe.
62,	Refrigeration, subclass 530 for an envelope type of cooling device.
126,	Stoves and Furnaces, subclasses 204+ for a body warmer.
160,	Flexible or Portable Closure, Partition, or Panel, subclass 44 for a flexible panel with liquid supplying means.
383,	Flexible Bags, subclass 901 for hot water and ice bags.
428,	Stock Material or Miscellaneous Articles, appropriate subclasses for a stock material product in the form of a flexible single or plural layer web or sheet.

[List of Patents for class 165 subclass 47]

STRUCTURAL INSTALLATION:

This subclass is indented under the class definition. Apparatus with means performing an operation external to the subject matter of this class or with a static construction installation, wherein there is included only so much structure foreign to Class 165 to associate it with the apparatus of Class 165.

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41+,	for a heat exchanger with a vehicle body or traction feature.
45,	for a heat exchanger having a feature related to the earth.

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65,	Glass Manufacturing, subclass 267 for a blow mold having heating or cooling means; subclass 319 for a press mold having heating or cooling means; and subclasses 355+ for other glass manufacturing apparatus having heating or cooling means.
68,	Textiles: Fluid Treating Apparatus, subclasses 15+ for a washing machine with a tank heater.
72,	Metal Deforming, subclasses 69 , 128, 200+, 286, 342, and 364, for a process or apparatus for modifying or maintaining the temperature of a machine or a metal workpiece in connection with deformation of the workpiece.
118,	Coating Apparatus, subclasses 58+ for a coating machine with a heat exchanger treating the work.
119,	Animal Husbandry, subclass 14.09 for a milking machine with a cooler; subclasses 302+ for a heated incubator; subclasses 311+ for a heated brooder and subclass 73 for a temperature controlled watering device.
126,	Stoves and Furnaces, subclasses 369 through 369.3for a steam chamber for food.
132,	Toilet, subclasses 41.01+ for a hair device with a heater.
134,	Cleaning and Liquid Contact With Solids, subclasses 105+ for a cleaning or liquid contact with solids apparatus with a heat exchanger.
141,	Fluent Material Handling, With Receiver or Receiver Coacting Means, subclass 82 for a receiver filling device with material heating or cooling structure.
174,	Electricity: Conductors and Insulators, subclasses 15.1+ for an electrical conductor or insulator with cooling structure.
184,	Lubrication, subclasses 104.1+ for a lubricator with heating or cooling means.
188,	Brakes, subclass 264 for a brake with a cooling and lubricating means, and subclass 274 for a fluid-resistance brake with a heat exchanger for the fluid.
192,	Clutches and Power-Stop Control, for a clutch with a cooling and lubricating means.
204,	Chemistry, Electrical and Wave Energy, appropriate subclasses for electrical treatment apparatus in combination with heat exchange means; especially subclasses 239 and 241 for an electrolytic apparatus with a heater or cooler.
209,	Classifying, Separating, and Assorting Solids, subclass 11 for a solid separator with heat treatment means; and subclass 238 for a sifter with heating or cooling means.
210,	Liquid Purification or Separation, subclasses 175+ for a liquid separator with an ancillary heat exchanger.
215,	Bottles and Jars, subclasses 12+ for a bottle or jar with a spaced wall or jacket.
220,	Receptacles, subclasses 592.05 , 592.23, 592.24, 495.01+, 23.9, and 23.91 for a receptacle of that class with a spaced wall or jacket.
222,	Dispensing, subclass 183 for dispensing apparatus wit a jacket casing.
228,	Metal Fusion Bonding, subclass 46 for apparatus for metal fusion bonding combined with cooling means and subclasses 199+ for corresponding methods.
241,	Solid Material Comminution or Disintegration, subclasses 65+ for a solid material comminutor with a temperature modifier for the material.
250,	Radiant Energy, subclass 238 for a photocell with temperature control means, subclass 352 for temperature controlled infrared responsive electric signalling means, subclass 429 for fluent material containment support or transfer means including temperature control of the fluent material, subclasses 493.1+ for invisible ray generator with cooling means.
269,	Work Holders, subclass 7 for a work holder with means for solidification of the work holding medium.
277,	Seal for a Joint or Juncture, for a generic sealing means or process, cross-reference art collection 930 for a seal having a heating or cooling feature.
285,	Pipe Joints or Couplings, subclass 41 for a pipe joint or coupling with heating or cooling means.
297,	Chairs and Seats, subclasses 180.1+ for a chair or seat with a heat exchanger.
310,	Electrical Generator or Motor Structure, subclasses 52+ for a rotary electrical motor or generator with cooling means.
313,	Electric Lamp and Discharge Devices, subclasses 11+ for an electric lamp or discharge device with a temperature modifier. See Lines With Other Classes and Within This Class in the definition of Class 313 for a statement of the line between Class 165 and Class 313.
314,	Electric Lamp and Discharge Devices: Consumable Electrodes, subclasses 26+ for an electric discharge device of the consumable electrode type with temperature modifying means.
331,	Oscillators, subclass 69 for an oscillator housing with a temperature modifier and subclass 70 for an oscillator with a temperature modifier.
336,	Inductor Devices, subclasses 55+ for an inductor device with temperature modifying means.
338,	Electrical Resistors, subclasses 53+ for an electrical resistor with cooling gas or liquid circulation.
361,	Electricity: Electrical Systems and Devices, subclasses 676+ and subclass 688 for miscellaneous electrical apparatus not elsewhere provided for with cooling means.
362,	Illumination, subclass 294 for a projecting lantern with cooling means.
366,	Agitating, subclasses 22+ for a mortar mixer with a heat exchange device.
373,	Industrial Electric Heating Furnaces, subclasses 42+ for a condenser in an electric furnace system.
384,	Bearings, subclass 317 for a rotary bearing with cooling means.
409,	Gear Cutting, Milling, or Planing, subclass 249 for a broaching machine with means to modify the temperature of the work or tool.
422,	Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, subclasses 186.11 , 186.19 and 186.20 for ozonizers with heating or cooling means; and subclass 186.26 for arc or spark discharge reactors with cooling or pressurizing means.
425,	Plastic Article or Earthenware Shaping or Treating: Apparatus, the appropriate apparatus subclass for the combination of heating or cooling means therewith; but see especially subclass 378.1 for an extrusion shaping machine including heating or cooling means, subclass 384 for apparatus for reshaping or vulcanizing a nonmetallic preform including both heating and cooling means, and subclass 406 for a press molding machine for non-metals including both heating and cooling means; see the search notes thereunder.
439,	Electrical Connectors, subclasses 190+ for an electrical connector having a retainer or passageway for fluent material; and subclasses 485+ for an electrical connector with provision to dissipate, remove, or block the flow of heat.
494,	Imperforate Bowl: Centrifugal Separators, subclasses 13+ , for a separator of that class provided with means for exchanging heat.

48.1	Heating and cooling:
	This subclass is indented under subclass 47. Apparatus in which the installed heat exchange apparatus performs both a heating and cooling operation that is more than a mere carrying of heat between a source and a sink.

48.2	Solar:
	This subclass is indented under subclass 48.1. Apparatus including a solar heater or a solar cooler.

49	Radiant building panel:
	This subclass is indented under subclass 48.1. Apparatus wherein a heat exchanging element is installed as an area of a room surface.

[List of Patents for class 165 subclass 50]

Room heat exchangers with central fluid supply:

This subclass is indented under subclass 48.1. Apparatus wherein there is a heat exchanger in each of a plurality of rooms and a fluid from a central heated or cooled supply communicates with the heat exchangers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

205+,

for automatic, interlocked plural zone and central system control.

[List of Patents for class 165 subclass 51]

Engine:

This subclass is indented under subclass 47. Apparatus in which the heat exchanger is associated with an engine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

43,	for a heated and cooled vehicle in which the vehicle engine supplies the heat and the power to operate the heating and cooling system.

SEE OR SEARCH CLASS:

60,	Power Plants, subclasses 320+ for treatment by heat exchange of the exhaust from the motor of a power plant.
123,	Internal-Combustion Engines, subclass 41.01 for a device limited by structure to use as an internal combustion engine element and having associated cooling means; and subclass 142.5 for an internal combustion engine element with means using heat from one part to heat another part by exchanging heat between the parts.
126,	Stoves and Furnaces, subclass 19.5 for a stove oven or vessel in which a combustion engine serves as the heat generator.
237,