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CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B 3/00; { ceramics C04B})
Definition statement
This subclass covers:

Passive two-terminal electrical components used to store energy in an electrical field, typically two electrical conductors, i.e. electrodes, separated by a dielectric or dielectric medium.

Non-electrolytic, fixed capacitors, per se, e.g. thin and thick film capacitors, details thereof, e.g. electrodes, dielectrics, housings and encapsulations, and structural combinations thereof with each other, e.g. stacked, multilayer, feed-through or anti-noise capacitors, or with electrolytic devices covered by this subclass, or with other electric elements not covered by this subclass where the structure consists mainly of a capacitor. Processes of manufacture thereof. H01G 4/00.

Non-electrolytic, variable capacitors per se, in which the capacitance is varied by mechanical means, e.g. using variation of effective area of electrode, using variation of distance between electrodes, e.g. capacitors making use of micro-electromechanical systems (MEMS), or using multiple capacitors. Details thereof, and structural combinations thereof with each other, with electrolytic devices covered by this subclass, or with other electric elements not covered by this subclass where the structure consists mainly of a capacitor. Processes of manufacture thereof. H01G 5/00.

Non-electrolytic, variable capacitors per se, in which the capacitance is varied by non-mechanical means, e.g. electrets, ferroelectric capacitors. Details thereof, and structural combinations thereof with each other, with electrolytic devices covered by this subclass, or with other electric elements not covered by this subclass where the structure consists mainly of a capacitor. Processes of manufacture thereof. H01G 7/00.

Electrolytic capacitors per se, e.g. liquid, solid, electric double layer, hybrid or redox capacitors, details thereof, e.g. terminals, electrolytes, electrodes, housings, and processes of manufacture thereof. Electrolytic rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices per se, and details thereof. Structural combinations thereof with each other, with non-electrolytic capacitors or with other electric components not covered by this subclass. Processes of manufacture thereof. H01G 9/00.

Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in other main groups of this subclass. H01G 13/00.

Structural combinations of capacitors or other devices covered by at least two different main groups of this subclass with each other. H01G 15/00.

Structural combinations of capacitors or other devices covered by at least two different main groups of this subclass with other electric elements, not covered by this subclass, e.g. RC combinations. H01G 17/00.Details common to two or more main types of devices covered by this subclass, e.g. special adaptation for mounting; cooling, heating and ventilating arrangements; housings, encapsulations and protection or prevention arrangements. H01G 2/00.

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

Selection of specified materials as dielectric

Capacitors with potential-jump or surface barrier

Electret transducers

Impedance networks utilizing capacitors, e.g. filters and circuitry thereof

Examples of places where the subject matter of this subclass is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Capacitive deionisation for electrochemical separation

Indicating or measuring liquid level, or level of fluent solid material by measuring variations of capacity of capacitors

Measuring temperature using capacitive elements

Thin- or thick-film integrated circuits; Capacitors as components of an integrated circuit, e.g. stacked capacitors in DRAMs

Thin-film capacitors for integrated circuits; corresponding multi-step manufacturing processes

Thin- or thick-film solid state devices

Printed circuits incorporating printed capacitors

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

Powder metallurgy

Layered products

Micro-mechanical devices, comprising flexible or deformable elements

Active carbon

Compositions of ceramic materials

Polymeric films or sheets

Electrolytic coating by surface reaction, i.e. forming conversion layers

Measuring force or stress by measuring variations in capacitance

Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by making use of variations in capacitance

Investigating or analyzing material by investigating capacitance

Measuring capacitance; Measuring dielectric constants

Variable capacitance devices operated as switches

Casings for electrical apparatus in general

Batteries and fuel cells

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

Special rules of classification within this subclass

Processes of manufacture specially adapted for manufacturing capacitors, e.g. parts thereof. e.g. dielectrics, electrodes, etc are covered by the corresponding product subgroups.

The following exceptions apply:

  • Solid inorganic dielectrics vapour deposited are covered by H01G 4/08.
  • Formation of the dielectric layer is covered by H01G 9/0032.
  • Formation of a solid electrolyte layer is covered by H01G 9/0036.
Glossary of terms
In this subclass, the following terms (or expressions) are used with the meaning indicated:

Collector

a conductive component in intimate contact with an electrode material in an electrolytic or electric double layer capacitor

Electrolyte

an ionic conducting liquid or solid either comprised in one of the electrodes, typically the cathode, of an electrolytic capacitor or ensuring electric conduction between electrode active parts or electric double layers therein in Electric Double Layer Capacitors

Synonyms and Keywords

In patent documents the following abbreviations are often used:

MLCC

Multilayer Ceramic Capacitor

EDLC

Electric Double Layer Capacitor

In patent documents the following expressions/words are often used as synonyms:

In patent documents the following expressions/words "capacitor" and "condenser" are often used as synonyms.

In patent documents the following expressions/words "supercapacitor", "ultracapacitor, "electrochemical capacitor" and "electric double layer capacitor" are often used as synonyms.

In patent documents the following expressions/words "multilayer capacitor" and "stacked capacitor" are often used as synonyms.

Light-sensitive devices
Definition statement
This subgroup covers:

Photoelectrochemical cells based on junctions between an inorganic semiconductor and an electrolyte

Photoelectrochemical cells based on a dye dissolved in the electrolyte or adsorbed on an electrode

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

Photo electrochemical storage cells

Solid state light sensitive devices using an organic semiconductor as the active part

Solid state light sensitive devices using an inorganic semiconductor as the active part

Special rules of classification within this group

In this group, documents are classified according to the ECLA Reform approach, i.e. "invention information" is identified with ECLA classification symbols, e.g. H01G 9/2031, while "additional information" is identified with Indexing Code symbols, e.g. H01G 9/2059.

In this subclass, Indexing Codes are mainly attributed with a view to allow retrievial of documents comprising a combination of technical characteristics, some of them being unimportant per se, and, hence, identified with an Indexing Code symbol rather than with the corresponding ECLA onepotential-jump barrier or surface barrier.

Synonyms and Keywords

DSSC

dye sensitized solar cell

PEC

photo electrochemical cell

{characterised by the electrolyte, e.g. comprising an organic electrolyte}
Informative references
Attention is drawn to the following places, which may be of interest for search:

Accumulators with non-aqueous electrolyte

Primary cells with non-aqueous electrolyte

{comprising an oxide semiconductor electrode}
Definition statement
This subgroup covers:

Photo electrochemical cells having an oxide semiconductor as working electrode or having oxide semiconductor particles dispersed in the electrolyte;

examples of oxide semiconductors are: zinc oxide [ZnO], tungsten trioxide [WO3], copper oxide [CuO], niobium pent oxide [Nb2O5]

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

Zinc oxides

Tungsten oxides

{comprising titanium oxide, e.g. TiO 2(H01G 9/2036 takes precedence)}
Definition statement
This subgroup covers:

Dye sensitized solar cells; the sensitizer may be a dye (organic) or an inorganic pigment, e.g. PbSe nano particels.

Working principle of a dye sensitized solar cell

Illustrative example of subject matter classified in this group.I

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US2009173381

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

Titanium oxides

{comprising a semiconductor electrode comprising AII-BVI compounds, e.g. CdTe, CdSe, ZnTe, ZnSe, with or without impurities, e.g doping materials (H01G 9/2027 takes precedence)}
References relevant to classification in this group
This subgroup does not cover:

Light sensitive devices comprising an oxide semiconductor electrode

{Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells}
Definition statement
This subgroup covers:
  • Serial interconnection of photoelectrochemical cells;
  • sealing of photoelectrochemical cells;
  • dye sensitized solar cells in form of a fibre;
  • special provisions for filling the photoelectrochemical cell with the electrolyte or dyeing solution.
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Last Modified: 10/11/2013