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PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL INTO ELECTRICAL ENERGY (electrochemical processes or apparatus in general C25; semiconductor or other solid state devices for converting light or heat into electrical energy H01L, e.g. H01L 31/00, H01L 35/00, H01L 37/00)
Definition statement
This subclass/group covers:

Constructional details or processes of manufacture of the non active parts, e.g. casings, mountings, vents, separators, current-conducting connections, arrangements for filling or emptying cases with or of liquid.

Electrodes composed of or comprising active material, processes of manufacture and active materials thereof, e.g. electrodes for primary cells, for lead-acid accumulator.

Inert electrodes with catalytic activity, processes of manufacture and catalytic materials thereof.

Primary cells, manufacture and servicing or maintenance thereof, e.g. cells with aqueous or non-aqueous electrolyte, deferred-action cells, printed batteries

Secondary cells, manufacture and servicing or maintenance thereof, heating or cooling; temperature control, e.g. lead-acid accumulators, alkaline accumulators, accumulators with non-aqueous electrolyte

Fuel cells or their stacks and manufacture thereof, e.g. alkaline fuel cell, polymer electrolyte fuel cell, solid oxide fuel cell, biochemical fuel cells comprising enzymes as catalysts

Combination of fuel cells with means for production of reactants, e.g. with reformer or for treatment of residues

Hybrid cells, e.g. Zinc-air battery, half-cell of a fuel cell type and half-cell of a primary or secondary cell type

Structural combinations of different types of electrochemical generators.

Relationship between large subject matter areas

This subclass does not cover the preparations of chemical compounds as such, which subject matter is covered by classes C01 (inorganic chemistry), C07 (organic chemistry) and C08 (organic macromolecular compounds).

Specific chemical compounds for batteries and their preparation are classified in C01, C07 and C08 as well as in H01M.

Apparatus for testing electrical condition of accumulator or batteries are classified in G01R 31/36 and accumulators combined with arrangements for measuring, testing or indicating condition are classified in H01M 10/48

Electrochemical processes or apparatus otherwise than for generating energy C25

References relevant to classification in this subclass/group
This subclass/group does not cover:

Hybrid capacitors

Circuits arrangements for charging or depolarising batteries or for supplying loads from batteries

Informative references
Attention is drawn to the following places, which may be of interest for search:

Catalysts

Disposal of solid waste

Working or processing of sheet metal or metal tubes

Casting of metals

Shaping of substances in a plastic state

Producing particular articles from plastics or from substances in a plastic state.

Arrangement or mounting of plural diverse prime-movers characterised by the electric storing means, e.g. batteries

Arrangement or mounting of plural diverse prime-movers characterised by the fuel cells

Electric propulsion using power supplied from primary cells, secondary cells or fuel cells

Arrangement of batteries specially adapted for vehicles

Supplying batteries to, or removing batteries from vehicles

Conjoint control of vehicle sub-units of different type including control of energy storage means, e.g. batteries

Conjoint control of vehicle sub-units of different type including control of fuel cells

Containers or packages with special means for dispensing contents for batteries

B65D85/88

Measuring or testing processes involving enzymes

Electrodes for electrolytic processes

Electrodes for electrolytic or electrophoretic process for the production of compounds or non metals

Diaphragms; spacing elements for electrolytic or electrophoretic process for the production of compounds or non metals

Electrodes for electrolytic production, recovery or refining of metals

Diaphragms; spacing elements for electrolytic production, recovery or refining of metals

Electrodes for electrolytic coating

Indicating or measuring liquid

Investigating or analysing materials by determining their chemical or physical properties

Apparatus for testing electrical condition of accumulator or electric batteries

Control of temperature

Electrolytic light sensitive devices

Electrolytes for electrolytic capacitors

Lithium-ion capacitors

Semiconductor or other solid state devices for converting light or heat into electrical energy

Electrically conductive connections

Conversion of dc power input into dc power output using batteries

Photovoltaic modules structurally associated with energy storage means, e.g. batteries

Special rules of classification within this subclass

Every technical aspect of the invention is classified with inventive symbols and additional information from the description with additional symbols. When the battery or fuel cell is characterised by the combination of a specific positive electrode, specific negative electrode and/or specific electrolyte: every specific components of the combination will be classified with inventive symbols.

When a breakdown Indexing Code represents the invention , the corresponding upper group should also be given.

When the type of battery is not mentioned, the classification of the invention is done in the primary and secondary type of battery classes.

When a group for a process does not exist, it is classified within the material of the object.

Additional orthogonal Indexing Codes are used for "additional information" and are always given together with a CPC group. Classification with these codes is highly desirable, since they provide an efficient search tool when combined with a CPC group.

They concern:

H01M 2200/00 and subgroups : Safety devices for primary or secondary batteries

H01M 2220/00 and subgroups : Batteries for particular applications

H01M 2250/00 and subgroups : Fuel cells for particular applications; Specific features of fuel cell system

H01M 2300/00 and subgroups : Electrolytes

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Active materials, active masses, active liquids

materials, masses, liquids participating in the electrochemical reactions

Inert electrodes

Electrodes characterised by their catalytic activity

Primary cells

Cells, where the cell energy present in chemical form is not regenerated

Secondary cells, accumulator

Rechargeable cells, characterised by reversible electrochemical reactions

Battery

Device comprising one or more electrochemical cells

NTC, PTC

NTC (negative temperature coefficient) thermistors with their resistance decreasing with increasing temperature, PTC (positive temperature coefficient) thermistors with their resistance rising with increasing temperature

Redox flow battery

Reversible fuel cell in which all electroactive components are dissolved in the electrolyte with a flow circulation system of the electrolyte

Redox fuel cell, indirect fuel cell

Fuel cell where the oxydant or fuel is not reacted directly at the electrode but with the reduced/oxidised form of a redox couple and the oxidised/reduced species are fed to cathode/anode

Synonyms and Keywords

Electrochemical storage device

Galvanic primary cell or secondary cell (battery, accumulator), electrochemical capacitors (in particular pseudocapacitors and hybrid capacitors

Constructional details or processes of manufacture of the non-active parts
Definition statement
This subclass/group covers:
  • Cases, jackets or wrappings, lids or covers, carrying devices, racks, fixing devices;
  • Vents plugs, mechanical arrangement for the escape of gas
  • Separators, diaphragms, spacing elements;
  • Current conducting connections for cells, terminals, connections for affording protection against corrosion, for preventing undesired use;
  • Arrangements for filling, emptying cases with or of liquid e.g. Electrolytes, moving electrolytes.
References relevant to classification in this subgroup
This subclass/group does not cover:

Constructional details or processes of manufacture of the non-active parts of fuel cells

Electrically conductive connectors connecting the battery to the load, electric system

Informative references
Attention is drawn to the following places, which may be of interest for search:

Electrotherapy, e.g. implantable medical devices

Separation using semi-permeable membrane

Drill tools

Portable power-driven tools

Shaping or joining plastics

Container for storage

Devices for moving or tilting heavy load, load-carrier

Making textile fabrics form fibers

Sealing

Valves

Special rules of classification within this subgroup

Small-sized batteries indicate batteries used in portable devices

Large-sized batteries indicate batteries used in vehicles or standby power.

When the use of a battery can not be deduce, the classification is done in both classes.

H01M 2/02 relates to the first wall around the active parts and H01M 2/10 relates to the second wall around the battery/cell.

When the material of separator is a mixture of fibrous and non-fibrous material, it's classified in the classes of the fibrous material.

Electrodes (electrodes for electrolytic processes C25, { electrodes for hybrid or electric double capacitor H01G 11/22})
Definition statement
This subclass/group covers:

Electrodes comprising active material for primary, secondary and hybrid cell and electrodes with catalytic activity for fuel cells.

Processes of manufacture of the electrodes, selection of substances as active materials, carriers or collectors, inactive substances as ingredients in the electrode, e.g. binder, conductive material

Relationship between large subject matter areas

The production of active material used in batteries is not classified in H01M but in C01B, C01D, C01F, C01G, C22C, C04B 35/00

Informative references
Attention is drawn to the following places, which may be of interest for search:

General process for applying liquids to obtain a coating with specific electrical properties

Processing of sheet metal

Casting of metals

Working metallic powder

Soldering, welding

Layered products

Nano-structures

Carbon

Compounds of alkali metals

Compounds of Be, Mg, Al, Ca, Sr, Ba, Ra, Th or rare earth metals

Compounds of manganese

Compounds of Nickel

Alloys

Shaped ceramic products

Organic macromolecular compounds

Coating metallic material, surface treatment of metallic material, e.g. vacuum evaporation

Electrolytic or electrophoretic processes for the production of compounds or non-metals, electrodes for those process

Carbon filaments

Conductors characterised by the conductive materials

Magnetic materials

Special rules of classification within this subgroup
  • The IPC rule concerning electrode for hybrid cells is applied
  • Classification of electrode versus classification of active material (H01M 4/38-H01M 4/60) should only be given when the invention concern the combination of active material and non-active materials, information given on the different elements constituting the electrode.
  • H01M 4/02 is only employed if the subject to be classified is general and does not concern the subgroups H01M 4/06, H01M 4/13, H01M 4/14, H01M 4/24
  • The process of manufacture of a specific type of battery electrode is classified in H01M 4/16-H01M 4/23 or H01M 4/26-H01M 4/30 or H01M 4/139-H01M 4/1399 and in H01M 4/04-H01M 4/0428 (double classification).
  • H01M 4/02 and H01M 4/04-H01M 4/0428 should not be used for fuel cell electrodes and their manufacture which are classified in H01M 4/86-H01M 4/8896
  • All the steps of the process of the manufacture of an electrode (battery electrode or fuel cell electrode) should be classified if possible.
  • When oxides are added in an electrode and when it' s not sure whether it's an active material or an additive, classes in H01M 4/48-H01M 4/57, H01M 4/62 and H01M 4/362 should be given
  • H01M 4/366 is used for any coating (the coating being a second active material or not). In the case the coating is not a second active material, H01M 4/62 subgroup should be given.
  • H01M 4/364 is only used for mixture of at least 2 active materials.
  • Classification of alloys under H01M 4/38 relate to the composition before charging, e.g. before the addition of lithium.
  • Electroactive polmyers classified in H01M 4/137 concern polymers where oxidation/reduction (redox) processes take place
  • Electrode composed of Lithium or lithium based alloy is classified in H01M 4/134
  • H01M 4/18 relates to Planté electrode process. It concerns lead dioxide generated by direct oxydation of lead that forms the conducting substrate.
  • Alkaline earth metals oxides or hydroxides, oxides or hydroxides of metal other than manganese, nickel, iron, cobalt, silver, lead, mercury are classified in H01M 4/48 and if they insert or intercalate light metals, they are classified in H01M 4/485.
Inert electrodes with catalytic activity, e.g. for fuel cells
Definition statement
This subclass/group covers:

Electrodes for fuel cells, comprising catalysts

Informative references
Attention is drawn to the following places, which may be of interest for search:

Catalysts

Process for preparing catalyst

Special rules of classification within this subgroup

Catalysts supported on carbon are not classified in H01M 4/96 but in H01M 4/9083 or H01M 4/926.

H01M 4/96 is only given if carbon is the catalytic species, e.g. for hybrid cells.

H01M 4/8647-H01M 4/8657 concern composite material, meaning comprising at least 2 catalysts having the same function and H01M 4/8615 concerns bifunctional electrode used in regenerative fuel cell with oxygen reduction catalyst and oxygen evolution reaction catalyst.

All the steps of the process of the manufacture of a fuel cell electrode

should be classified if possible within subgroups H01M 4/88-H01M 4/8896

The process for making electrocatalyst are classified within the catalyst material subgroups H01M 4/90-H01M 4/923. Catalysts used only in fuel cells are not classified in B01J.

Primary cells; Manufacture thereof
Definition statement
This subclass/group covers:
  • Primary batteries with aqueous electrolyte, non-aqueous electrolyte and solid electrolyte.
  • primary batteries activated by addition of electrolyte, by physical means (thermal and mechanical)
  • thin film or flat or printed primary batteries
  • Methods or arrangements for maintenance of primary batteries including heating or cooling, primary batteries combined with cell condition or safety devices, regeneration of reactants or electrolyte, type recognition
Informative references
Attention is drawn to the following places, which may be of interest for search:

Thermoelectric solid state devices

Special rules of classification within this subgroup

Classification for primary and secondary non aqueous batteries:

Solid polymer electrolyte of a battery is not classified in H01M 8/1018 unless the use in a fuel cell is mentioned.

Printed battery in H01M 6/40 concern thin film battery.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Primary cells

Electrochemical generators in which the cell energy is present in chemical form and is not regenerated

Fuel cells; Manufacture thereof
Definition statement
This subclass/group covers:

Fuel cells including:

  • Collectors, separators, interconnectors, gas diffusion layer.
  • Sealing or frames, its processes and materials.
  • Membranes, matrices holding electrolytes solutions or melts.
  • Means for temperature measurement or control, for reactant control or regulation.
  • Methods for controlling fuel cells or fuel cell systems with detection and regulation of variables.
  • System of fuel cells with means for production of reactants or for treatment of residues.
  • Types of fuel cell : with aqueous electrolytes, with solid electrolyte at low temperature (below 200-250°C), with solid electrolyte at high temperature. with molten electrolyte, biofuelcells with enzymes working as catalysts.
  • Manufacture of fuel cells.
Relationship between large subject matter areas

Hydrogen production is classified in C01B 3/00

Informative references
Attention is drawn to the following places, which may be of interest for search:

Separation of gases or vapour

Semi-permable membranes

Recycling of heat from fuel cell to other parts of a car

Fuel cells used to drive air conditioning

Prime movers consisting of electric motors and internal combustion engines characterised by the fuel cells

Vehicles using power supplied from primary cells, secondary cells pr fuel cells

Arrangement or adaptations of fuel cells in cosmonautic vehicles

Manufacture of ion-exchange membrane

Production of combustibles gases containing carbon monoxide from solid carbonaceous fuels

Liquid carbonaceous fuels

Micro-organisms or enzymes

Enzyme electrodes in measuring or testing process

Vessels for containing or storing compressed, liquefied or solidified gases

Burners for combustion of a gas

Gas-turbine combustion chambers

Special rules of classification within this group
  • Membranes for immobilising electrolyte solutions or electrolyte melts are classified in H01M 8/0289-H01M 8/0295 and membranes used as support or mixed with polymer electrolytes are classified in H01M 8/1058-H01M 8/1062.
  • Means for control of temperature, pressure, reactant, electrolyte, water are classified in subgroups H01M 8/04007-H01M 8/04291 and methods for controlling fuel cells or fuel cell systems are classified in H01M 8/04298-H01M 8/04992.
  • Reactant in a fuel cell is only what is delivery immediately to the fuel cell, e.g. liquid methanol is evaporated to gaseous methanol that is used then in a fuel cell, only H01M 8/04089 will be used.
  • Means for preventing methanol crossover (gaseous or liquid methanol) are classified in H01M 8/04261
  • H01M 8/04119 concerns the humidification in the fuel cell
  • H01M 8/04291 is used for water management of the fuel cell system.
  • Rules for H01M 8/04298
  • When the claims refer to control and/or process/management of the fuel cell, then classes in H01M 8/04298+ should be given and it's the description + claims (if they are clear) that are classified. Every variable really disclosed/discussed and not just listed as part of a whole list should be classified using classes.
  • If only general details is given in the detected and/or regulated variables, then the upper classes H01M 8/04313 and/or H01M 8/04694 should be given.
  • When control/management is detailed only in the description, then Indexing Codes should be used for the classification
  • When the control of a fuel cell concerns the detection/measurement of environmental variables 8e.g. temperature, pressure, humidity of the ambiance), the classes H01M 8/0432 should be given if it concerns the detection of ambient temperature or H01M 8/0438 if it concerns ambient pressure, etc..
  • In a system with means for production of reactants or treatment of reactants or residues, if the fuel cell aspect is not the invention (only mentioned in the description or the last (sub)claim, the document should only be classified with an Indexing Code H01M 8/00.
  • If the fuel cell in combination with the other means is the invention, then the subgroups under H01M 8/06 are used.
  • H01M 8/188 and H01M 8/20 should be both allocated for redox flow battery
  • H01M 8/24 subgroups are used when the invention concern the stack of fuel cells as such
  • The Indexing Codes H01M 8/083, H01M 8/086, H01M 2008/1095, H01M 2008/1293, H01M 2008/147 should be used to indicate the type of fuel cell
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Porous separator

gas diffusion layer

Separator

bipolar plate, interconnector

Combination of fuel cell with means for production of reactants or for treatment of residues
Special rules of classification within this subclass/group

The combination of fuel cell with means for production of reactants, e.g. reformer or for treatment of residues, e.g. removal of sulfur will be classified in H01M 8/06 subgroups.

If the invention concern specifically the mean associated with the fuel cell, the means is classified and the aspect of the combination of the fuel cell with that mean is classified in H01M 8/06 subgroups as additional symbol.

Temperature control means of a system combining fuel cell and for example a reformer will be classified in H01M 8/06 subgroups, H01M 8/04298 subgroups and in C01B 3/02 subgroups if the temperature control concerns the reformer.

Every means in a combination system will be classified as invention or additional symbol according to the specific aspect of the invention, e.g. emphasis on the system or on a specific mean.

{Reforming processes, e.g. autothermal, partial oxidation or steam reforming}
Relationship between large subject matter areas

Reformers are classified in C01B 3/02 subgroups

Special rules of classification within this subclass/group

In a system comprising fuel cell and reformer, if the invention concerns only the reformer, the reformer will be classified in C01B 3/02 subgroups and the fuel cell (minor aspect) will be classified with H01M 8/06 as additional symbol.

If the invention concerns the whole system, then the invention is classified in H01M 8/06 subgroups.

Secondary cells; Manufacture thereof
Definition statement
This subclass/group covers:

Construction in general.

Several types of secondary batteries : lithium batteries, lead acid batteries, alkaline batteries, high temperature batteries.

Methods or arrangements for servicing or maintenance.

Cooling, heating, regulating temperature.

Recycling.

Relationship between large subject matter areas

Circuits for charging or depolarising or for supplying loads from batteries are classified in H02J 7/00-H02J 7/36 and the methods for charging or discharging are classified in H01M 10/44-H01M 10/445.

Measuring electric variables are classified in G01R 31/36 if the measurement device is not structurally combined with the battery

Air conditioner of a car classified in B60H is also classified under H01M 10/50-H01M 10/5097 if it's used for cooling/heating a battery.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Heating, cooling or ventilation devices in vehicles

Arrangement of electric storage means for propulsion

Prime movers consisting if electric motors and internal combustion engines

Vehicles using power form primary cells, secondary cells or fuel cells

Arrangement of batteries in a vehicle

Supplying batteries to, or removing batteries from vehicles

Specific uses or applications of nano-structures

Electrochemical actuator

Heat exchange or heat transfer apparatus

Control of temperature in general

Indicating or measuring liquid in general

Arrangement for obtaining electrical energy form radioactive source

Investigating fluid tightness of structure

Measuring density

Investigating or analysing materials by the use of electric, electrochemical or magnetic means

Semi-conductors devices

Generators in which kinetic energy is converted into electrical energy

Portable receivers and arrangement for mounting batteries or batteries chargers

Portable phone with battery compartment

Printed circuits

Special rules of classification within this subgroup
  • Small-sized batteries indicate batteries used in portable devices
  • Large-sized batteries indicate batteries used in vehicles or standby power.
  • Construction classes under H01M 10/12, H01M 10/28, H01M 10/058, H01M 10/38 take precedence over H01M 10/04.
  • For non aqueous secondary battery, a class indicating the type of battery, e.g. H01M 10/052 should always be given in addition to the classes related to construction H01M 10/058-H01M 10/0587 or to the classes related to the type of electrolyte H01M 10/056-H01M10/0659.
  • Solid polymer electrolyte of a battery is not classified in H01M 8/1018-H01M 8/1093 unless the use of this polymer in a fuel cell is indicated.
  • Special rules for the subgroups H01M 10/42-H01M 10/488
  • Additives in electrolyte having the function of safety are classified in H01M 10/0567 for example and also in H01M 10/4235. Fusing, polymerising additives are also classified in H01M 10/4235.
  • Structurally combination indicates attached to the battery or in the battery housing.
  • Printed circuits integrated to the outside of the casing of the battery, e.g. on the cover) are classified in H01M 10/425
  • H01M 10/4257 concern battery with incorporated memory, microchip, electronic circuit inside the housing of the cells or batteries.
  • The use of printed circuit as a casing of a battery is classified in H01M 2/10.
  • Apparatus for testing the cell or battery and not incorporated with the battery is classified in H01M 10/4285
  • The regeneration of electrolyte or reactants done by non electrical means is classified in H01M 10/4242
  • Any ratio between electrode/electrolyte, anode/cathode of a secondary battery is classified in H01M 2010/4292
  • Removing gas inside the battery by water recombination is classified in H01M 10/52.
  • Gel electrolytes are double classified in H01M 10/0565 if they concern gel-type polymeric material for non-aqueous accumulator and H01M 2300/0085
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Accumulator

secondary battery

Secondary cells

Accumulators receiving and supplying electrical energy by means of reversible electrochemical reactions

Hybrid cells; Manufacture thereof
Definition statement
This subclass/group covers:

hybrid cells, e.g. :

  • half cell of capacitor type and half-cell of primary or secondary battery type
  • half cell of fuel cell type and half cell of primary or secondary cell type
Relationship between large subject matter areas

Hybrid capacitors are classified in H01G 9/155

Special rules of classification within this group
  • If the invention concern electrodes, classes of fuel cell electrodes (H01M 4/86-H01M 4/98) and/or battery electrodes (H01M 4/02-H01M 4/84) are given in combination with the Indexing Code of the hybrid cells.
  • The casing and the lid of the hybrid cells are classified in H01M 2/0255 and H01M 2/0452 respectively.
  • Methods or arrangements for servicing or maintenance are classified in H01M 6/50 or H01M 10/42 according to the type of half battery cell. The control of half fuel cell type is classified under H01M 8/04298-H01M 8/04992.
  • All hybrid cell concerning half capacitor, half battery should be circulated to H01G.
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

Hybrid cells

Electrochemical generators having two different types of half-cells, the half-cell being an electrode-electrolyte combination of either a primary, a secondary, or a fuel cell

Electrochemical current or voltage generators not provided for in groups H01M 6/00 - H01M 12/00; Manufacture thereof
Definition statement
This subclass/group covers:

Every type of electrochemical cell that is not classified in the above groups.

Photoelectrochemical storage cells wherein the light causes a change in chemistry and the energy is stored and discharged at later stage.

Relationship between large subject matter areas

Solar cells are classified in H01G 9/20 and only if the energy produced by the solar cell is stored then it will be also classified in H01M 14/005.

References relevant to classification in this subgroup
This subclass/group does not cover:

Light sensitive devices (photocells)

Synonyms and Keywords

In patent documents the following expressions/words "photocells", "photoelectrochemical cells (PEC)", "photovoltaic cells" and "solar cells" are often used as synonyms.

{Photoelectrochemical storage cells (light sensitive devices H01G 9/20, semiconductors sensitive to light H01Ll31/00)}
Definition statement
This subclass/group covers:

Photoelectrochemical storage cells wherein the light causes a change in chemistry and the energy is stored and discharged at later stage.

Relationship between large subject matter areas

This group does not cover solar cells, photocells, photoelectrochemical cells or photovoltaic cells which are covered by the following groups:

  • Semiconductor devices sensitive to light and adapted for the conversion of the energy of such radiation into electrical energy are covered by group H01L 31/00
  • Solid-state devices using organic materials as active part specially adapted for sensing light and adapted for the conversion of the energy of such radiation into electrical energy are covered by group H01L 51/42
  • Electrolytic light sensitive devices, e.g. dye-sensitised solar cells, are covered by group H01G 9/20
  • Photovoltaic modules structurally associated with energy storage are covered by group H02S 40/38
References relevant to classification in this subclass/group
This subclass/group does not cover:

Semiconductor devices sensitive to light

Solid-state devices using organic parts specially adapted for sensing light

Electrolytic light sensitive devices

Photovoltaic modules structurally associated with energy storage

Structural combinations of different types of electrochemical generators
Definition statement
This subclass/group covers:

Association of fuel cells with other electrochemical generators, e.g. fuel cell + electrolysers, fuel cell+ battery, fuel cell + capacitor

References relevant to classification in this subgroup
This subclass/group does not cover:

Combination of secondary battery with capacitor

{of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers}
Definition statement
This subclass/group covers:

Association of fuel cells with other electrochemical generators, e.g. fuel cell + electrolysers, fuel cell+ battery, fuel cell + capacitor

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013