CPC Definition - Subclass F25B
This place covers:
Refrigeration machines, plants or systems; combined heating and refrigeration systems; heat-pump systems.
Cold production at temperatures below ambient, not transportation of heat.
Attention is drawn to the following places, which may be of interest for search:
Evaporation or evaporation apparatus for physical or chemical purposes, e.g. evaporation of liquids for gas phase reactions | |
Cooling of a manufacturing process | |
Arrangements or adaptations of heating, cooling, ventilating or other air-treating devices specially for passenger or goods spaces of vehicles | |
Air plane air-conditioning | |
Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion | |
Mechanical-power-producing mechanisms | |
Pumps, compressors | |
Piston compressors | |
Rotary compressors | |
Centrifugal compressors | |
Valves | |
Use of heat pumps for domestic or space-heating or for domestic hot-water supply | |
Air-conditioning, air-humidification | |
Fluid heaters using heat pumps | |
Liquefaction, solidification, or separation of gases or gaseous mixtures by pressure and cold treatment | |
Details of heat-exchange or heat-transfer apparatus, of general application | |
Cooling of personal computers | |
Cooling of superconducting magnets | |
Modifications to facilitate cooling, ventilating or heating of different types of electric apparatus |
When classifying heat pump circuits or systems, groups F25B 1/00 - F25B 25/00 and F25B 29/00 take precedence over group F25B 30/00.
Classification in F25B when refrigeration cycle of air-conditioner is claimed, except for reheat circuits: circulate to F24F 3/153.
F24F, when focus is on air side of refrigeration cycle.
B60H, when focus on refrigeration cycle is specific for a car (e.g. car speed, sunlight).
F24D 11/00, when focus is on heat water/heating heat pumps.
F25D, when a cold room is cooled.
This place covers:
Compression machines, plants or systems with non-reversible cycle.
This place does not cover:
Self-contained rotary compression machines, i.e. with compressor, condenser, and evaporator rotating as a single unit | |
Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity | |
Compression machines, plants or systems, with several condenser circuits | |
Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit | |
Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point |
This place does not cover:
Of the single unit type | |
With multi-stage compression |
This place covers:
Ejectors operating as compressor.
This place does not cover:
Of the single unit type | |
With multi-stage compression |
Attention is drawn to the following places, which may be of interest for search:
Fluid-circulation arrangements |
This place does not cover:
With cascade operation |
Attention is drawn to the following places, which may be of interest for search:
Multi-stage operation | |
Compression machines, plants or systems with reversible cycle |
The refrigerant flow determines if the evaporators are in series or in parallel, not the air flow.
F25B 5/00 classification of documents having parallel and series evaporators combined in one embodiment.
F25B 5/02 classification of documents having only evaporators in parallel in one document.
F25B 5/04 classification of documents having only evaporators in series in one document.
Documents combining embodiments with only evaporators in parallel with embodiments with only evaporators in series should be classified in F25B 5/02 inventive information and F25B 5/04 additional information or F25B 5/04 inventive information and F25B 5/02 additional information.
Evaporators exchanging heat at different pressure levels are additionally classified in F25B 1/10 additional information.
Attention is drawn to the following places, which may be of interest for search:
Compression machines, plants or systems with reversible cycle |
The refrigerant flow determines if the condensers are in series or in parallel, not the air flow.
F25B 6/00 classification of documents having parallel and series condensers combined in one embodiment.
F25B 6/02 classification of documents having only condensers in parallel in one document.
F25B 6/04 classification of documents having only condensers in series in one document.
This place does not cover:
Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point |
Attention is drawn to the following places, which may be of interest for search:
Primary and secondary systems |
Attention is drawn to the following places, which may be of interest for search:
Refrigerants | |
Arrangement or mounting of refrigeration units with respect to device | |
Thermal coupling structure or interface |
Attention is drawn to the following places, which may be of interest for search:
Air-conditioning |
This place does not cover:
The refrigerant being air |
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or features of compression machines, plants or systems characterised by the refrigerant being carbon dioxide | |
Special arrangements or features of compression machines, plants or systems characterised by the refrigerant being carbon dioxide with the cycle highest pressure above the supercritical pressure | |
Refrigerant materials per se |
Special arrangements or features of compression machines, plants or systems characterised by the refrigerant being carbon dioxide are additionally classified in F25B 2309/06 and F25B 2309/061 when the cycle highest pressure is above the supercritical pressure.
This place does not cover:
With several cooling stages |
F25B 9/10 takes precedence, however in case of multi-stage expander classify also in F25B 9/06 additional information. Only gas cycle and CO2 expanders are classified in F25B 9/06, other expanders are classified in F25B 11/02 or in F25B 2400/14
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or features of Ericsson cycles | |
Control of a Stirling refrigeration machine | |
Stirling motors | |
Engine plants with Vuilleumier-type cycles |
Special arrangements or features of Ericsson cycles are additionally classified in F25B 2309/1401.
Control of Stirling refrigeration machines is classified in F25B 2309/1428.
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or features of pulse-tube cycles | |
Thermoacoustic engines |
Special arrangements or features of pulse -tube cycles are additionally classified in F25B 2309/1402 and sub-groups thereof.
This place covers:
Compression machines, plant, or systems, using turbines, e.g. gas turbines.
With CO2 as refrigerant classify in F25B 9/06.
This place covers:
Compression machines, plant, or systems with reversible cycle: both condenser and evaporator change function when reversing the reversing valve.
This place does not cover:
Defrosting cycles: |
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or features of compression machines, plant, or systems with reversible cycle not otherwise provided for |
Special arrangements or features of compression machines, plant, or systems with reversible cycle not otherwise provided for are additionally classified in F25B 2313/00.
This place covers:
Sorption machines, plants or systems, operating continuously, e.g. absorption type.
vaporization of the refrigerant; absorption of the vapour by an absorbing liquid; extraction of the refrigerant vapour by heating this liquid; condensation of the refrigerant; expansion of the refrigerant.
Attention is drawn to the following places, which may be of interest for search:
Sorption machines, plants or systems, operating intermittently | |
Boilers, Analysers, Rectifiers | |
Boiler-absorbers, i.e. boilers usable for absorption or adsorption | |
Absorbers, Adsorbers | |
Special arrangements or features of sorption refrigeration cycles |
Special arrangements or features of sorption refrigeration cycles are additionally classified in F25B 2315/00.
This place covers:
Absorption systems which, in addition to refrigerant and absorbent, also employs an inert medium (such as hydrogen) in order to balance pressure in the various parts of the refrigerating circuit
This place does not cover:
Of rotary type | |
With cascade operation | |
With multi-stage operation | |
With resorber | |
Using osmosis | |
Using desorption cycle |
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or features of inert heat-exchangers |
Special arrangements or features of inert heat-exchangers are additionally classified in F25B 2315/004.
This place covers:
Sorption machines, plants or systems with alternating periods of vaporization and condensation.
Attention is drawn to the following places, which may be of interest for search:
Sorption machines, plants or systems, operating continuously | |
Boilers, analysers, rectifiers | |
Boiler-absorbers, i.e. usable for absorption or adsorption | |
Absorbers, Adsorbers | |
Special arrangements or features of sorption refrigeration cycles |
This place covers:
Machines, plants or systems, using electric or magnetic effects.
Attention is drawn to the following places, which may be of interest for search:
Details of machines, plants or systems using electro-caloric effects | |
Details of machines, plants or systems using magneto-caloric effects | |
Details of machines, plants or systems using thermionic electron cooling effects | |
Magnets, Selection of materials for their magnetic properties |
Additional classification of details of machines, plants, or systems using electro-caloric effects in F25B 2321/001; magneto-caloric effects in F25B 2321/002; thermionic electron cooling effects in F25B 2321/003.
Attention is drawn to the following places, which may be of interest for search:
Details of machines, plants or systems using Peltier effects | |
Semiconductor devices | |
Thermoelectric elements |
This place covers:
Cooling by radiation to the night sky, e.g. by selective coating on a (night sky) radiator.
Attention is drawn to the following places, which may be of interest for search:
Heat-exchange apparatus in which the medium condenses and evaporates, e.g. heat pipes |
This place covers:
Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B 1/00 - F25B 23/00.
Attention is drawn to the following places, which may be of interest for search:
Pump speed control | |
Arrangements for circulating liquids |
Classification in F25B 25/005 when focus is on primary side of refrigeration cycle. However classification in F25D 17/02 when focus is on secondary side of the refrigeration cycle.
This place covers:
Machines, plants or systems, using particular sources of energy should be read as driven by particular sources of energy.
This place does not cover:
Heat pumps characterised by the source of low potential heat |
Attention is drawn to the following places, which may be of interest for search:
Refrigeration system using an engine for driving a compressor | |
Solar heat collectors specially adapted for particular uses or environments |
Refrigeration system using an engine for driving a compressor are additionally classified in F25B 2327/00.
Attention is drawn to the following places, which may be of interest for search:
Solar heat collectors |
This place covers:
Combined heating and refrigeration systems, e.g. operating alternately or simultaneously should be read as operating simultaneously.
Only classify in F25B 29/00 when cooling and heating is used simultaneously.
F25B 13/00 takes precedence.
This place covers:
Refrigeration systems employed for heating, by using the heat given off by the condenser.
This place does not cover:
Compression machines, plants or systems with non-reversible cycle; Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups | |
Combined heating and refrigeration systems, e.g. operating alternately or simultaneously |
Attention is drawn to the following places, which may be of interest for search:
Water-cooled condensers | |
Central heating systems using heat pumps |
When classifying heat pump circuits or systems, groups F25B 1/00 - F25B 25/00 and F25B 29/00 take precedence over group F25B 30/00. Classification in F25B 30/00 when heat of condenser is used for a specific purpose, e.g. hot tap water.
Attention is drawn to the following places, which may be of interest for search:
Machines or engines in general | |
Compressors (lubrication of) | |
Cooling of compressors | |
Cooling of compressors by injecting a liquid in the gas to be compressed |
This place covers:
Boilers/generators: that part of an absorption machine in which the refrigerant vapour is driven off by heat.
Analysers: a small fractionating column, in an absorption machine between generator and rectifier or condenser.
Rectifiers: that part of an absorption machine in which entrained absorbent is removed from the refrigerant vapour before condensation.
This place does not cover:
Boiler-absorbers |
Attention is drawn to the following places, which may be of interest for search:
Special arrangements of details of boilers; Analysers; Rectifiers |
This place covers:
Boiler-absorbers, i.e. boilers usable for absorption or adsorption
Attention is drawn to the following places, which may be of interest for search:
Sorption machines, plant, or systems, operating continuously, e.g. absorption type | |
Sorption machines, plant, or systems, operating intermittently, e.g. absorption or adsorption type |
This place does not cover:
Boiler-absorbers |
Attention is drawn to the following places, which may be of interest for search:
Separating processes involving the treatment of liquids with solid sorbents | |
Separation of gases or vapours by adsorption | |
Separation of gases or vapours by absorption | |
Liquid distributor absorbing units | |
Investigating using adsorption or absorption |
This place covers:
Evaporators: heat exchangers in which liquid refrigerant is vaporized to produce refrigeration;
Condensers: heat exchangers in which refrigerant vapour is liquefied by removal of heat.
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or details of evaporators | |
Special arrangements or details of condensers | |
Heat-exchange in general | |
Heat-exchange apparatus not provided for in another subclass, in which the heat-exchange media do not come into direct contact | |
Details of heat-exchange or heat-transfer apparatus of general application | |
Elements constructed in the shape of a hollow panel, e.g. with channels |
Classification in F25B 39/00 when both evaporator and condenser are claimed. When a heat exchanger, e.g. evaporator is claimed, classify in F25B 39/00 inventive information and F25B 39/02 additional information.
When a heat exchanger, e.g. condenser is claimed classify in F25B 39/00 inventive information and F25B 39/04 additional information.
Special arrangements or details of evaporators are additionally classified in F25B 2339/02.
Special arrangements or details of condensers are additionally classified in F25B 2339/04.
Attention is drawn to the following places, which may be of interest for search:
For heat exchange in general |
This place covers:
Subcoolers: Heat exchangers, after the condenser, for subcooling the condensed refrigerant. Sometimes also called supercooler.
Desuperheaters: Heat exchangers, preceding the condenser for removing all or part of the superheat.
Superheaters: Heat exchanger in which wet vapour leaving an evaporator is dried and superheated.
When heat-exchanger is a combination of heat-exchangers of sub-groups F25B 40/02, F25B 40/04 or F25B 40/06 classify in F25B 40/00 and, as additional information, two out of three of F25B 40/02, F25B 40/04 or F25B 40/06.
This place covers:
Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler.
Ejector refrigeration cycle with the ejector used as expansion device.
Free or natural cooling.
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or details of ejectors not being used as compression device | |
Pumps per se, sealings therefor | |
Valves | |
Regulating valves |
Ejectors used as expansion device are classified in F25B 41/00 and F25B 2341/001
A compression cycle with natural or free cooling mode is classified in F25B 41/00 in combination with F25B 2400/0401 and F25B 2400/0411.
This place covers:
The configuration of valves in refrigeration circuits. For example:
- on-off valves;
- flow control valves not used as expansion means;
- fluid flow reversing valves.
This place does not cover:
Expansion valves |
Devices which are purely expansion means should be classified in group F25B 41/30.
This place covers:
Dispositions of means in a refrigeration circuit that provides expansion for the refrigerant fluid. For example:
- capillary tubes;
- expansion valves.
Attention is drawn to the following places, which may be of interest for search:
Special arrangements or details of flow restrictors or expansion valves | |
Control of expansion valves | |
Regulating valves per se |
Additionally classify special arrangements or details of flow restrictors or expansion valves in F25B 2341/06.
Additional classification of control of expansion valves in F25B 2600/2513.
This place covers:
Flow restrictors with fixed openings.
This place covers:
Pipe structures: connections, fittings, joints.
Attention is drawn to the following places, which may be of interest for search:
Arrangements for charging or discharging refrigerant | |
Pipes; Joints or fittings for pipes; supports for pipes cables or protective tubing; Means for thermal insulation in general |
This place covers:
Arrangements for separating or purifying gases or liquids
This place does not cover:
Arrangements for separating or purifying gases or liquids in analysers or rectifiers | |
Subcoolers, desuperheaters or superheaters |
This place covers:
Filters and/or driers.
Attention is drawn to the following places, which may be of interest for search:
Filters in general |
Attention is drawn to the following places, which may be of interest for search:
Suction acumulators with deflectors | |
Receivers |
Additonal classification of high pressure receivers in F25B 2400/16.
This place covers:
Charging/discharging of refrigerant to/from a cycle from an external source.
Balancing of refrigerant within a cycle.
Attention is drawn to the following places, which may be of interest for search:
Details for charging or discharging refrigerants; Service stations therefor | |
Means for monitoring, testing or servicing the air-conditioning of vehicles |
Details for charging or discharging refrigerants and details of service stations are additionally classified in F25B 2345/00 and lower.
This place covers:
Preventing frost/condensation.
Attention is drawn to the following places, which may be of interest for search:
Alternate defrosting |
Classification in F25B 47/02 when heat for defrosting is extracted from refrigerating cycle itself, otherwise classify in F25D 21/00. Details of defrosting cycles are additionally classified in F25B 2347/02 and lower.
This place covers:
Also classification of monitoring devices.
This place does not cover:
For compression type machines, plants or systems | |
For sorption type machines, plants or systems |
Attention is drawn to the following places, which may be of interest for search:
Control of multiple evaporators | |
High pressure supercritical control the refrigerant being carbon dioxide | |
Control of expansion valve only | |
Defrost control | |
Control of expansion valves | |
Sensing or detecting of parameters; Sensors therefor | |
Compressor control in general | |
Control of air-conditioning reheater | |
Testing refrigerators | |
Control in general | |
Motors |
Attention is drawn to the following places, which may be of interest for search:
Compressor control | |
Sensing or detecting of parameters; Sensors therefor | |
Compressor control arrangements in general |
Details of compressor control are additionally classified in F25B 2600/02.
Details of sensing or detecting of parameters and sensors therefor are additionally classified in F25B 2700/00.
Attention is drawn to the following places, which may be of interest for search:
Compressor control inverters therefor | |
Sensing or detecting of parameters; Sensors therefor | |
Motors per se |
Details of inverter compressor control are additionally classified in F25B 2600/02.
Details of sensing or detecting of parameters and sensors therefor are additionally classified in F25B 2700/00.
Attention is drawn to the following places, which may be of interest for search:
Fan speed control of condenser fans | |
Sensing or detecting of parameters; Sensors therefor |
Details of fan speed control of condenser fans are additionally classified in F25B 2600/02.
Details of sensing or detecting of parameters and sensors therefor are additionally classified in F25B 2700/00.