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MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
Definition statement
This subclass/group covers:

The use of materials for applications not provided for elsewhere, e.g. sealing materials, drilling fluids.

The use of materials in general having specific properties, not provided for elsewhere, e.g. anti-static properties, anti-oxidation properties.

Materials selected for uses or applications not provided for elsewhere.

All entries in this subclass relate to specific properties (e.g. C09K 3/16 relates to materials with anti-static properties) or specific applications of materials (e.g. C09K 17/00 relates to soil-conditioning or soil-stabilizing materials), except for main group C09K 3/00 itself, which is the residual place for classifying materials with properties or applications for which no entries exist in C09K itself nor elsewhere in IPC.

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

Materials or their applications or uses for which entries are available elsewhere in IPC.

Places in relation to which this subclass is residual:

Applications of materials relating to agriculture, foodstuffs, medical or cosmetic preparations,
A
e.g. preparations for medical, dental, or toilet purposes
Applications of materials relating to physical or chemical processes in general,
B
e.g. sorbent compositions or catalysts
Chemical treatment of wood or similar materials
Pure chemistry, which covers compounds and their methods for preparation:
inorganic chemistry
organic chemistry
organic macromolecular compounds and their compositions
Coating compositions, e.g. paints
Fuels
Applications of materials relating to fibrous materials, textiles or paper
D
Applications of materials relating to photography, cinematography and analogous techniques
Applications of materials relating to electric or electronic elements
H
Selection of materials for their conductive, insulating, or dielectric properties
Selection of materials for electrochemical generators, e.g. batteries
Selection of materials for piezo-electric materials
Informative references
Attention is drawn to the following places, which may be of interest for search:
Solid sorbent compositions
Materials for treatment of water, waste water, or sewage
Fertilisers,
C05
e.g. mixtures of soil-conditioning or soil-stabilising materials with fertilisers characterised by their fertilising activity
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Materials
include compounds, compositions, mixtures and preparations
Materials not provided for elsewhere
Definition statement
This subclass/group covers:

Only materials for which no specific application is mentioned, for example thickeners that can be used for any composition are classified in this class .

Relationship between large subject matter areas

Compositions for which an application is mentioned i.e. an application class is available , the documents are classified in the relevant application class only , for example: thickener for food A23, for cosmetics A61, for paints C09D.

[N:  Materials in mouldable or extrudable form] for sealing or packing joints or covers (filling pastes  HYPERLINK "sfpluscla://ECLA/C09D 5/34" C09D 5/34 )
Definition statement
This subclass/group covers:

Material in extrudable or mouldable form

Relationship between large subject matter areas

C09K relates to materials not provided elsewhere,

therefore

If the sealant is only claimed with regard to a specific application and if in said specific application field a class related to the chemical nature of the sealant exists the document should only be classified in the application field

e.g.:

B29C 73/16 (tyre puncture sealing)

B60R 13/06 (sealing strips)

C09K 8/50-C09K 8/518 (sealing or packing boreholes or wells)

References relevant to classification in this group
This subclass/group does not cover:
Filling pastes
Adhesives
Lime, cements, mortars
Informative references
Attention is drawn to the following places, which may be of interest for search:
Compositions of macromolecular compounds
Use of inorganic ingredients
Use of organic ingredients
Special rules of classification within this subclass/group

If no specific application of the sealant is cited, the document should only be classified in the appropriate C09K 3/10 class.

If the sealant is claimed without specific uses the document should be classified in the appropriate C09K 3/10 class,

however

If specific applications are cited (e.g. in the description) the document should additionally be classified in the relevant application fields

and

if many different applications are cited the document should only be classified in the appropriate C09K 3/10 class.

C09K 3/1006 is not used for classification.

All documents not falling under the definition of C09K 3/1003 or in the range C09K 3/1009 to C09K 3/1021 should be classified in C09K 3/10

Classification of additional information is done by using Indexing Codes:

for indexing the properties and uses of the material : C09K 3/10 to C09K 2003/1096

for indexing the chemical nature of the material: C09K 2200/00 to C09K 2200/0697

Anti-slip materials; Abrasives [N: (products specifically intended for the fabrication of abrasive tools, blocks or papers, or for operations of the kind of sand-blasting and barrelling B24B 31/14, B24C 1/00; polishing compositions containing abrasive or grinding agents C09G 1/02; polishing of semi-conductors H01L; friction compositions for brakes or clutches F16D 69/02)]
References relevant to classification in this group
This subclass/group does not cover:
Polishing compositions containing an abrasive which is not specific or polishing compositions WITHOUT abrasive
Products specifically intended for the fabrication of abrasive tools, blocks or papers, or for operations of the kind of sand-blasting and barrelling
Polishing compositions containing abrasive or grinding agents
Polishing of semi-conductors H01L; friction compositions for brakes or clutches
Informative references
Attention is drawn to the following places, which may be of interest for search:
Abrasives as fillers for polymers
Cleaning or scraping pads
Lapping
Polishing of glass
Polishing of metals
products specifically intended for the fabrication of abrasive tools, blocks or papers, or for operations of the kind of sand-blasting and barrelling
Sawing fluids e.g. of silicon ingots, precious stones
Tools, grinding wheels
; polishing compositions containing abrasive or grinding agents
polishing of semi-conductors
friction compositions for brakes or clutches
Special rules of classification within this group

In this class boron and silicon are considered as metals , as well as association of carbon with metals e.g. carbides . Particles coated with boron , silicon or carbides : C09K 3/1445

[N: Abrasive particles per se (preparation of diamond C01B 31/06)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Preparation of particles in general
Abrasive particles for sand blasting
Preparation of diamond
Abrasives particles as fillers for polymers
[N: Abrasive powders, suspensions and pastes for polishing]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Lapping
Methods and processes for polishing semi-conductors
Polishing of glass
Polishing of semi-conductors
Sawing fluids e.g. of silicon ingots, precious stones
Anti-static materials
References relevant to classification in this group
This subclass/group does not cover:
Conductive materials
Informative references
Attention is drawn to the following places, which may be of interest for search:
Photo paper
Antistatic paper
For application to surfaces to minimize adherence of ice, mist or water thereto (rendering particulate materials free flowing, in general, e.g. making them hydrophobic B01J 2/30); Thawing or antifreeze materials for application to surfaces (used in liquids for heat-transfer, heat-exchange or heat-storage or for the production of heat or cold other than by combustion, e.g. radiator liquids, C09K 5/00)
Definition statement
This subclass/group covers:

Compositions for non permanent treatment , with no formation of a permanent coating

Relationship between large subject matter areas

A permanent coating, film on a surface is classified in C09D, e.g. water based barrier cohesive film

References relevant to classification in this group
This subclass/group does not cover:
Rendering particulate materials free flowing, in general, e.g. making them hydrophobic
Permanent coating ( polymer -> film)
Used in liquids for heat-transfer, heat-exchange or heat-storage or for the production of heat or cold other than by combustion, e.g. radiator liquids,
Informative references
Attention is drawn to the following places, which may be of interest for search:
Dewatering of surfaces
Glass surfaces
Process for dewatering
Treatment of agricultural products
Treatment of bulk material e.g. sand or coal
Treatment of textiles
For dust-laying or dust-absorbing
Definition statement
This subclass/group covers:

Compositions for non-permanent treatment

Informative references
Attention is drawn to the following places, which may be of interest for search:
Treatment of fertilisers in powder form
Treatment of mines
Treatment of road surfaces
Treatment of tunnel walls
For simulating ice or snow
Informative references
Attention is drawn to the following places, which may be of interest for search:
Fabrication of Ice or snow for sports
Artificial surfaces for winter sports
for aerosols (aerosol containers  HYPERLINK "sfpluscla://ECLA/B65D 83/14" B65D 83/14 )
Definition statement
This subclass/group covers:

Chemical compounds and mixtures of chemical compounds, e.g. propellants for aerosols

Informative references
Attention is drawn to the following places, which may be of interest for search:
Aerosol containers
Inhalators
Sprayers for therapeutic purposes
For absorbing liquids to remove pollution, e.g. oil, gasoline, fat
Informative references
Attention is drawn to the following places, which may be of interest for search:
Apparatus for removing oil from water
Litters for animals
Solid sorbents
Treatment of water
Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; materials for the production of heat or cold by chemical reactions other than by combustion
Definition statement
This subclass/group covers:

Materials undergoing a change of physical change when used

Materials not undergoing a change of physical change when used

Materials undergoing chemical reactions when used

Antifreeze additives

Informative references
Attention is drawn to the following places, which may be of interest for search:
Arrangement or adaptations of heating, cooling, ventilating, or other air-treating devices specially for passenger or goods spaces of vehicles
Corrosion inhibitors
Details of heat-exchange and heat-transfer apparatus, of general application
Heat-exchange apparatus
Lubricating compositions
Refrigeration machines, plants or systems, combined heating and refrigeration systems; heat systems
Use of solar heat; selection of specific heat-exchange medium
Special rules of classification within this group

Last place rule applies

When classifying in C09K 5/042, C09K 5/044 and C09K 5/045 classification of additional information is done by using Indexing Codes:

for indexing the chemical nature of the material: C09K 2205/00 to C09K 2205/48

The subgroups of C09K 5/08 might be incomplete as some of the patent documents classified in C09K 5/08 might need reclassification to one or more groups C09K 5/10 to C09K 5/14

The group C09K 5/18 might be incomplete as some of the patent documents classified in C09K 5/16 might need reclassification to C09K 5/18

Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
References relevant to classification in this group
This subclass/group does not cover:
Oil recovery from bituminous sands
C10G31/04
Special rules of classification within this group

C09K 8/02 to C09K 8/38 : Last Place Rule

Drilling fluids with fluid loss additives : C09K 8/02-C09K 8/38 and C09K 8/50-C09K 8/536

when appropriate use Indexing Code for "spotting" and E21B 31/03

Synonyms and Keywords
Spotting fluids
Fluids for releasing stuck drill string

Synonyms and Keywords

Spotting fluids
Fluids for releasing stuck drill string
Specific additives for general use in well-drilling compositions
Definition statement
This subclass/group covers:

Only when the additive as such is disclosed without specification of the drilling fluid OR if it is for any kind of drilling fluid : C09K 8/03-C09K 8/035

Special rules of classification within this group

mixtures of inorganic and organic additives : C09K 8/03 only

[N: characterised by the composition of the clay]
Definition statement
This subclass/group covers:

well defined clay sorts

Relationship between large subject matter areas

Organoclays per se are classified in C01B 33/44

Drilling fluids comprising organoclays will be classified in C09K 8/145 and C01B 33/44

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

organoclays per se : C01B 33/44

Synthetic organic compounds
Definition statement
This subclass/group covers:

Monomers

Organic liquids
Definition statement
This subclass/group covers:

Specific non- oil components , e.g. olefins ,paraffins , special environmently friendly components

Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells (compositions for plastering C09K 8/50)
References relevant to classification in this group
This subclass/group does not cover:
Compositions for plastering borehole walls
Proppants
Sealing or packing boreholes or wells
Well-drilling compositions
Special rules of classification within this group

Documents classified in C09K 8/42 and subgroups receive also a class and CIS codes in C04B in order to define the cementitious composition in more detail.

Multiple classes can be used where appropriate.

Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls (compositions for consolidating loose sand or the like around wells C09K 8/56)
Definition statement
This subclass/group covers:

Temporary seal , sealing for control of water flow in or out the formation, fluid loss control, profile modification

References relevant to classification in this group
This subclass/group does not cover:
Permanent seal for e.g. killing/closing a well
Compositions for consolidating loose sand or the like around wells
Special rules of classification within this group

- No last place rule in C09K 8/50 to C09K 8/94,multiple classification when appropriate

- When appropriate : use Indexing Code for fibers

Synonyms and Keywords

In patent documents the following expressions/words "fluid loss control" , "filtration control", "profile control" and "temporary sealing" are often used as synonyms.

characterised by their form or by the form of their components, e.g. encapsulated material
Special Rules of classification within this group

For fibers : use Indexing Code

Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning[N0409]
Definition statement
This subclass/group covers:

Compositions for use in the well also for removing drilling residues

Cleaning is also called remediation

Relationship between large subject matter areas

Compositions for use in the pipes F17D

Special rules of classification within this group

- No last place rule in C09K 8/52 to C09K 8/536 , multiple classification needed if material incorporated in characteristic form.

- Compositions for removing drilling residues : C09K 8/52

- For preventing formation of hydrates formation C09K 8/52 and Indexing Code for "hydrates inhibition"

-Compositions for removing /preventing specific depositions C09K 8/524-C09K 8/532

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Cleaning
remediation
Sulfur
Definition statement
This subclass/group covers:

Also sulfides

Special rules of classification within this group

For H2S use corresponding Indexing Code

Compositions for in situ inhibition of corrosion in boreholes or wells
Informative References
Attention is drawn to the following places, which may be of interest for search:
Corrosion inhibitors as such
Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
Definition statement
This subclass/group covers:

secondary and tertiary recovery

References relevant to classification in this group
This subclass/group does not cover:
Injection of Carbon dioxide alone
Method/Process for enhanced recovery
Informative references
Attention is drawn to the following places, which may be of interest for search:
Bacteria
Surfactants as such
Special rules of classification within this group

- No last place rule in C09K 8/58-C09K 8/594, multiple classification might be needed

- Viscolelastic surfactants : Indexing Code for VES

characterised by the use of bacteria
Definition statement
This subclass/group covers:

also enzymes

Relationship between large subject matter areas

Bacteria as such : C12P, C12R

Synonyms and Keywords

In patent documents the following abbreviations are often used:

MEOR
Enhanced oil recovery using bacteria
characterised by the use of specific surfactants
Definition statement
This subclass/group covers:

also polymeric surfactants

Informative references
Attention is drawn to the following places, which may be of interest for search:
Surfactants as such
Special rules of classification within this group

Indexing Code for VES (viscoelastic surfactants )

Compositions used in combination with injected gas [N: e.g. CO2 or carbonated gas](C09K 8/592) takes precedence
References relevant to classification in this group
This subclass/group does not cover:
Injection of CO2 alone
N: e.g. CO2 or carbonated gas
Compositions for stimulating production by acting on the underground formation
References relevant to classification in this group
This subclass/group does not cover:
Methods for stimulating production
Special rules of classification within this group

Details of composition: C09K 8/84 to C09K 8/88

[N: containing surfactants]
Definition statement
This subclass/group covers:

also demulsifiers surfactants

[N: specially adapted for clay formations]
Definition statement
This subclass/group covers:

capillary imbibition

Compositions for forming crevices or fractures
References relevant to classification in this group
This subclass/group does not cover:
Gas fracturing
Methods for forming fractures or crevices
Methods for reinforcing fractures by propping
Special rules of classification within this group

C09K 8/62 should be used in combination with the classes for specific components

[N: containing inorganic compounds (proppants C09K 8/80)]
Definition statement
This subclass/group covers:

gel breakers

containing organic compounds
Definition statement
This subclass/group covers:

monomers and polymers

References relevant to classification in this group
This subclass/group does not cover:
Methods for fracturing
Proppants
Special rules of classification within this group

- defined polymers C09K 8/68 and classes C09K 8/88-C09K 8/905

- defined surfactants ,C09K 8/68 and class C09K 8/602 and Indexing Code for viscoelastic surfactants (VES) when appropriate.

-organic gel breakers : C09K 8/68 and Indexing Code for " gel breaker" or "bacteria or enzyme breaker"

Characterised by their form or by the form of their components, e.g. foams
Definition statement
This subclass/group covers:

also gas

[N: Encapsulated breakers]
Definition statement
This subclass/group covers:

also breakers with any coating which delays the action of the breaker (i.e. also surfactant around the particles)

Eroding chemicals, e.g. acids
Definition statement
This subclass/group covers:

acid fracturing - acidizing, - fracture acidizing- matrix acidizing

References relevant to classification in this group
This subclass/group does not cover:
Use of weak acids for cleaning without creating crevices
Special rules of classification within this group

Acidizing in combination with drilling , C09K 8/72 and C09K 8/02

combined with additives added for specific purposes
Definition statement
This subclass/group covers:

- corrosion inhibitors

- surfactants

- breakers

Special rules of classification within this group

when appropriate, use Indexing Codes for :

- anticorrosion

- Viscoelastic surfactant (VES)

- "gel breaker" or "bacteria or enzyme breaker"

for preventing sealing
Definition statement
This subclass/group covers:

anti-sludge additives

Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
Definition statement
This subclass/group covers:

Compositions for consolidating fractures and compositions of proppants

References relevant to classification in this group
This subclass/group does not cover:
Fabrication of inorganic particles
Fabrication of organic particles
Methods for reinforcing fractures by propping
Specific inorganic materials
C01
characterised by their form or by the form of their components, e.g. encapsulated material (C09K 8/70 takes precedence)
Definition Statement
This subclass/group covers:

The group covers

also gas

References relevant to classification in this group
This subclass/group does not cover:
encapsulated material
Tenebrescent materials, i.e. materials for which the range of wavelength for energy absorption is changed as result of excitation by some form of energy
Definition statement
This subclass/group covers:

Tenebrescent materials, i.e. materials for which the range of wavelength for energy absorption is changed as result of excitation by some form of energy

Relationship between large subject matter areas

Photosensitive materials for photographic purposes G03C

References relevant to classification in this group
This subclass/group does not cover:
Liquid crystal materials
Photochromic glass
In thermometers
In photochromic filters
In optical modulation devices
Materials in cathodochromic screens
Informative references
Attention is drawn to the following places, which may be of interest for search:
Luminescent materials
Special rules of classification within this group

Markush formulae or generic formulae are not classified, only concrete embodiments or examples are classified. Simple lists of known compounds (without application in an example or embodiment) are not classified.

C09K 9/02 (organic tenebrescent materials), C09K 11/06 (organic phosphors)

The respective Indexing Code-codes (range C09K 2211/00) for specific organic compounds have to be applied for all newly classified documents.

The documents have to be circulated to the corresponding classifiers in organic chemistry or polymers.

Other neighbouring fields should receive the document if an application in the respective field is mentioned (e.g. semiconductors, markers in biotechnology).

The last-place rule is strictly applied (no double classification in the main group and the respective sub-groups).

Markush formulae or general formulae are not classified, only concrete embodiments or examples.

Luminescent, e.g. electroluminescent, chemiluminescent materials
Definition statement
This subclass/group covers:

Luminescent materials, i.e. materials emitting light after excitation by some form of energy in the form of e.g. electrical energy, chemical energy, radiation in the visible, ultraviolet, X-ray or gamma-ray range

References relevant to classification in this group
This subclass/group does not cover:
Liquid crystal materials
Informative references
Attention is drawn to the following places, which may be of interest for search:
Tenebrescent materials
Special rules of classification within this group

Markush formulae or generic formulae are not classified, only concrete embodiments or examples are classified. Simple lists of known compounds (without application in an example or embodiment) are not classified.

C09K 11/06 (organic phosphors)

The respective Indexing Code (range C09K 2211/00) for specific organic compounds have to be applied for all newly classified documents.

The documents have to be circulated to the corresponding classifiers in organic chemistry or polymers.

Other neighbouring fields should receive the document if an application in the respective field is mentioned (e.g. semiconductors, markers in biotechnology).

C09K 11/08 and subgroups (inorganic phosphors):

all elements in the inorganic compounds are used to determine the position in the scheme including the doping materials (Si,Al)(O,N) SiAlON, SiN, AlN phosphors are classified under the respective subclasses dealing with silicates/aluminates (e.g.C09K 11/7721, C09K 11/7734 etc.) and additionally under C09K 11/0883, in order to classify the nitride. A silicate and aluminate is a compound containing a silicion and/or aluminium atom and an anion. Under this definition nitrides ((Si,Al)(O,N)), fluorides (e.g.K2SiF6), sulfides (e.g. BaAl2S4) are considered as silicates/aluminates.

In all other cases the last-place rule is strictly applied (no double classification in the main group and the respective sub-groups).

Markush formulae or general formulae are not classified, only concrete embodiments or examples.

Magnesium is considered as an earth alkali metal for the purpose of this classification scheme.

Etching, surface-brightening or pickling compositions (for glass C03C 15/00, [N: C03C 25/66; for mortars, concrete, artificial or natural stone or ceramics C04B 41/5338]; for metallic material C23F, C23G 1/00, C25F 1/00; [N: for semi-conductors H01L])
Definition statement
This subclass/group covers:

Also covers etching of silicon and germanium

References relevant to classification in this group
This subclass/group does not cover:
Etching of glass
for glass
For mortars, concrete, artificial or natural stone or ceramics
for metallic material
Etching of metals
Etching of polymers
Methods for etching semi-conductors
Polishing compositions
Special rules of classification within this group

Last place rule is to be applied

Anti-oxidant composition; Compositions inhibiting chemical change ([N: for use in well-specified applications, see the relevant places, e.g. in etching or pickling compositions C09K 13/00, C23G], in foodstuffs A21D, A23, [N: in association with organic compounds C07C, C07D], in macromolecular compositions C08; in liquid fuels or lubricants C10; in fats, fatty substances, fatty oils or waxes C11B 5/00; in detergents C11D; [N: coating or impregnating carbon or graphite based bodies to protect them from oxidation C04B 41/45]; corrosion inhibiting compositions for metallic material C23F 11/00)
Definition statement
This subclass/group covers:

also UV absorbers

References relevant to classification in this group
This subclass/group does not cover:
Compositions for preserving food
In foodstuffs
A21D, A23
Oxygen scavengers in packaging materials
In association with organic compounds
In macromolecular compositions
C08
In liquid fuels or lubricants
C10
In fats, fatty substances, fatty oils or waxes
In detergents
Coating or impregnating carbon or graphite based bodies to protect them from oxidation
Corrosion inhibiting compositions for metallic material
Special rules of classification within this group

- anti-oxidised compositions : classified according to the composition itself

- inhibited compositions

In C09K 15/00 to C09K 15/34 : Last Place Rule

Deviation from IPC definition : In present class a metallic salt or complex is classified in C09K 15/32 or C09K 15/326

Soil-conditioning materials or soil-stabilising materials (specially adapted for boreholes or wells C09K 8/00; fertilisers C05; consolidating by placing solidifying or pore-filling substances in the soil E02D 3/12)
Definition statement
This subclass/group covers:

Also covers mixtures of soil conditioning materials with fertilisers if the material is characterised by the soil conditioning or soil-stabilising activity

References relevant to classification in this group
This subclass/group does not cover:
Mixtures of soil conditioning materials with fertilisers characterised by the fertilising activity
Specially adapted for boreholes or wells
Consolidating by placing solidifying or pore-filling substances in the soil
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cement grouts
Coating of dams
Fertilisers
Protection of foundations
Securing of slopes
Sports fields
Treatment of contaminated soils
Special rules of classification within this group

In C09K 17/02 to C09K 17/52 : Last Place Rule

Aluminium compounds, e.g. aluminium hydroxide
Definition statement
This subclass/group covers:

also aluminates, zeolites, pozzolanic materials

Applied in a physical form other than a solution or a grout, e.g. as platelets or granules
Definition statement
This subclass/group covers:

also foams

Polyacrylates; Polymethacrylates
Definition statement
This subclass/group covers:

also polyacrylamides

Of natural origin, e.g. cellulosic materials
Definition statement
This subclass/group covers:

also starch derivatives, sugars, proteins, biopolymers

Inorganic compounds mixed with organic active ingredients, e.g. accelerators
Definition statement
This subclass/group covers:

also microorganisms as organic active ingredient

Mulches
Definition statement
This subclass/group covers:

also

- film-forming compositions

- cover layers , geotextile

Informative references
Attention is drawn to the following places, which may be of interest for search:
Protective coverings for plants
Liquid crystal materials
Definition statement
This subclass/group covers:

Liquid crystal (LC) compounds (non-polymeric, as well as polymeric),

mixtures of liquid crystal compounds, and mixtures of liquid crystal compounds with additives that are NOT liquid crystal compounds (solvents, solid particles, macromolecular compounds, aligning agents, dopants, charge transfer agents, surfactants, pleochroic dyes).

Relationship between large subject matter areas

Organic compounds C07

Organic macromolecular compounds C08

Optical elements, systems, or apparatus G02B

Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics G02F 1/00

References relevant to classification in this group
This subclass/group does not cover:
The electronics of a liquid crystal display
Polarising elements
Light-modulating devices
Informative references
Attention is drawn to the following places, which may be of interest for search:
Copolymers in which the nature of only the monomers in minority is defined
Heterocyclic compounds containing five‑membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
Holograms
Luminescent elements
G02F1/13357L
Manufacture of films or sheets
Optical Filters
Record Carriers
Recording or reproducing by optical means;[N: Recording by modifying optical properties, (e.g. by using electromagnetic radiation)
Surface‑induced orientation of the liquid crystal molecules, e.g. by alignment layers
Special rules of classification within this group

In the subgroups C09K 19/02 to C09K 19/603, in the absence of an indication to the contrary, materials are classified in the last appropriate place. In the case of Markush formulae, the inventive idea is classified. Further, an attempt is made to classify each exemplified embodiment.

The general philosophy could be summarized as follows:

LC compounds or the LC mixtures characterised in general by the optical, electrical or physical properties of the components are classified in the subgroups C09K 19/02 to C09K 19/0283. The two-dot subgroups C09K 19/0208 to C09K 19/0283 are non-hierarchical and each embodiment or example of a LC compound or mixture should be classified and may be placed in a different subgroup.

These subgroups cover LC compounds or the LC mixtures characterised in general by the chemical structure of the liquid crystal component, mainly the specific ring or rings or ring system(s) used, as well as the linking groups between the rings.

C09K 19/52 to C09K 19/603 These subgroups cover LC mixtures characterised in general by the chemical structure of the components, which are not liquid crystals, e.g. additives.

In short every document may classified

in one or more subgroups from C09K 19/02 to C09K 19/0283 and/or

in one or more subgroups from C09K 19/04 to C09K 19/50 and/or

in one or more subgroups from C09K 19/52 to C09K 19/603.

  We place the LC embodiments in groups, where we expect to retrieve them accurately and efficiently during search. When in doubt, classify! What goes under a specific group is straightforward, since the title of the group is comprehensive.

Next to the ECLA Scheme (based on the ring(s) of the LC molecules), a non-hierarchical Indexing Code has been developed to cater for cases, where a specific unit, a linking group, an end group, the positioning of a substituent, or a special bonding is the characterising part of the chemical structure of the liquid crystal component, instead of the ring or rings that constitute the LC molecule.

That means that documents in various groups may get the same Indexing Code.

Figuratively speaking, the Indexing Code (C09K 19/04 to M09K19/04G04) cuts vertically the EC-Scheme.

In other cases (C09K 19/06 to end) the Indexing Code gives

a more detailed view of the sequence of rings and linkers in a LC molecule or

a more detailed list of the compounding ingredients.

characterised by optical, electrical or physical properties of the components, in general
Special rules of classification within this group

LC compounds or the LC mixtures characterised in general by the optical, electrical or physical properties of the components are classified in the subgroups C09K 19/02 to C09K 19/0283. The two-dot subgroups C09K 19/0208 to C09K 19/0283 are non-hierarchical and each embodiment or example of a LC compound or mixture should be classified and may be placed in a different subgroup.

characterised by the chemical structure of the liquid crystal components, [N: e.g. by a specific unit]
Definition statement
This subclass/group covers:

LC compounds or the LC mixtures characterised by the chemical structure of the liquid crystal components, that is by a specific unit - see the Indexing Code.

[N: the structure containing one or more specific, optionally substituted ring or ring systems]
Definition statement
This subclass/group covers:

LC compounds or the LC mixtures characterised in that the structure contains one or more specific, optionally substituted ring or ring systems - see the Indexing Code.

[N: Sugars (polysaccharides C09K 19/3819)]
Definition statement
This subclass/group covers:

Sugars.

References relevant to classification in this group
This subclass/group does not cover:
Polysaccharides
Non-steroidal liquid crystal compounds
Definition statement
This subclass/group covers:

Non-steroidal liquid crystal compounds; e.g. linear compounds without any rings, as well as mainly containing  ONE non-condensed ring.

Special rules of classification within this group

Non-steroidal liquid crystal compounds; e.g. linear compounds like R1-COO-R2, R-O-CH=CH2, or R-COOH, as well as mainly containing  ONE non-condensed ring like R-Cy-COOH, or  R-(A-Z1)n-Cy-R2 with n=0-3.

containing at least two non-condensed rings
Definition statement
This subclass/group covers:

Liquid crystal compounds containing at least two non-condensed rings,

e.g. not naphthyl, fluorene and the like

If the rings are clearly defined,they are classified in lower subgroups C09K 19/10 to C09K19/3098

containing at least two benzene rings
Definition statement
This subclass/group covers:

Liquid crystal compounds containing at least two benzene rings - see the Indexing Code.

Special rules of classification within this group

A mixture of C09K 19/12 and/or C09K 19/126 and/or C09K 19/14 and/or C09K 19/16 and/or C09K 19/18 is classified in C09K 19/10. Here we stay in the common nod of the hierarchical tree, from which the five nods depend.

at least two benzene rings directly linked, e.g. biphenyls
Special rules of classification within this group

In C09K 19/12 for example not only compounds such as Ph-Ph, Ph-Ph-Ph, Ph-Ph-Ph-Ph etc. are classified, but also mixtures of such compounds.

linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters
Special rules of classification within this group

A mixture of Ph-O-C2H4-Ph (C09K 19/20) and Ph-COO-Ph (C09K 19/2007) is classified in C09K 19/20. Here the common nod of the hierarchical tree, from which the two nods depend, is the first nod.

containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
Definition statement
This subclass/group covers:

Liquid crystal compounds containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane, cyclohexene, cyclobutane rings - see the Indexing Code

Special rules of classification within this group

A mixture of Cy-C2H4-Cy (C09K 19/3028) (II) and Cy-Ph-Ph (C09K 19/3003) (III) is classified in C09K 19/3001 (I). Here we stay in the common nod (I) of the hierarchical tree, from which the two nods (II) and (III) depend.

A mixture of C09K 19/3001 and/or C09K 19/3003 and/or C09K 19/3028 and/or C09K 19/3048 and/or C09K 19/3059 is classified in C09K 19/3001. Here we stay in the common nod of the hierarchical tree, from which the five nods depend.

[N: Compounds containing at least two rings in which the different rings are directly linked (covalent bond)]
Special rules of classification within this group

A mixture of Cy-Ph-Cy (C09K 19/3003) and Cy-Ph-Ph (C09K 19/3003) is classified in C09K 19/3003. Here we stay in the same nod of the hierarchical tree.

containing condensed ring systems, i.e. fused, bridged or spiro ring systems
Definition statement
This subclass/group covers:

Liquid crystal compounds containing condensed ring systems, i.e. fused, bridged or spiro ring systems.

Here is a non limited list of fused, bridged or spiro ring systems classified under this group: anthracene, phenanthrene, fluorene, triphenylene, azulene, perylene, dibenzopyrene, twistane, bicyclopentane, hexabenzocoronene, resorcinarenes, propellane, truxene, carboranes, cubane,chrysene, decacyclene, calixarenes, triptycene, metacyclophanes, cyclotriveratrylene, cyclotetraveratrylene, trisbenzocyclononene, tetrabenzocyclododecatatraene, hexahelicene, octahelicene, fullerene.

containing at least one heterocyclic ring
Definition statement
This subclass/group covers:

Liquid crystal compounds containing at least one heterocyclic ring.

Special rules of classification within this group

Liquid crystal compounds containing at least one heterocyclic ring, where the ring comprises oxygen, nitrogen, or sulfur or any combination of these three elements.

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

Also fused compounds, like quinoxaline.

Steroidal liquid crystal compounds
Definition statement
This subclass/group covers:

Steroidal liquid crystal compounds.

Special rules of classification within this group

Liquid crystal cholesterol derivatives.

Polymers
Definition statement
This subclass/group covers:

Polymeric compounds with liquid crystalline properties.

References relevant to classification in this group
This subclass/group does not cover:
Mechanical properties of the polymers appear
Special rules of classification within this group

Here we classify polyesters and polyester derivatives such as polyamides, with mesogenic groups in the main chain.

containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen or sulfur, e.g. silicon, metals
Definition statement
This subclass/group covers:

Liquid crystal compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen or sulfur, e.g. silicon, boron, phosphorus, metals.

Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K 19/06 to C09K 19/40
Definition statement
This subclass/group covers:

Mixtures of liquid crystal compounds.

Mixtures containing two or more liquid crystal compounds covered individually by the same group C09K 19/04 to C09K 19/408 are classified only in that group. In other words, in C09K 19/12 for example not only compounds such as Ph-Ph, Ph-Ph-Ph, Ph-Ph-Ph-Ph etc. are classified, but also mixtures of such compounds.

Different embodiments for LC mixtures may be classified in a different group. If liquid crystal components of the mixtures classified in groups from C09K 19/42 to C09K 19/50 are of importance as such, they should also be classified according to the compounds in groups from C09K 19/04 to C09K 19/408.

Special rules of classification within this group

Here we classify mixtures of liquid crystal compounds containing compounds covered by two or more of the preceding groups C09K 19/06 through C09K 19/408 - compare the numbered sets 4 to 12 of the main subgroups. However, if all compounds of the mixture fall under the same head subgroup, the mixture is classified in that head subgroup. Some examples might clarify this:

• A mixture of Cy-Ph-Cy (C09K19/39A1) and Cy-Ph-Ph (C09K19/39A1) is classified in C09K19/39A1. Here we stay in the same nod of the hierarchical tree.

• A mixture of Cy-C2H4-Cy (C09K19/39A2) (II) and Cy-Ph-Ph (C09K19/39A1) (III) is classified in C09K19/39A (I). Here we stay in the common nod (I) of the hierarchical tree, from which the two nods (II) and (III) depend.

• A mixture of Ph-O-C2H4-Ph (C09K 19/20) and Ph-COO-Ph (C09K 19/2007) is classified in C09K 19/20. Here the common nod of the hierarchical tree, from which the two nods depend, is the first nod.

• A mixture of C09K 19/12 and/or C09K 19/126 and/or C09K 19/14 and/or C09K 19/16 and/or C09K 19/18 is classified in C09K 19/10. Here we stay in the common nod of the hierarchical tree, from which the five nods depend.

• A mixture of C09K 19/3001 and/or C09K 19/3003 and/or C09K 19/3028 and/or C09K 19/3048 and/or C09K 19/3059 is classified in C09K 19/3001. Here we stay in the common nod of the hierarchical tree, from which the five nods depend.

Containing compounds with benzene rings directly linked
Special rules of classification within this group

Here we classify mixtures of liquid crystal compounds containing compounds with benzene rings directly linked falling under C09K 19/12. Example Cy-C2H4-Cy and Ph-Ph.

containing esters
Special rules of classification within this group

Here we classify mixtures of liquid crystal compounds containing ester compounds falling under C09K 19/2007 through C09K 19/2028, or under C09K 19/3068. Example Cy-OCF2-Cy and Ph-COO-Ph.

containing Schiff bases
Special rules of classification within this group

Here we classify mixtures of liquid crystal compounds containing Schiff base compounds falling under C09K 19/22. Example Cy-OCH 2-Cy and Ph -CH=N-Ph.

containing steroidal liquid crystal compounds
Special rules of classification within this group

Here we classify mixtures of liquid crystal compounds containing steroidal liquid crystal compounds falling under C09K 19/36.

characterised by components which are not liquid crystals, e.g. additives [N: with special physical aspect: solvents, solid particles]
Special rules of classification within this group

These subgroups cover LC mixtures characterised in general by the chemical structure of the components, which are not liquid crystals, e.g. additives, solvents, organic or inorganic solid particles, macromolecular compounds, dopants.

Aligning agents
References relevant to classification in this group
This subclass/group does not cover:
The alignment layers per se
Special rules of classification within this group

Here we classify Aligning Agents used in admixture with LC materials to improve the aligning properties of the LC materials.

Fireproofing materials
Definition statement
This subclass/group covers:

Inorganic materials

Organic materials

Macromolecular materials

References relevant to classification in this group
This subclass/group does not cover:
Fire-extinguishing compositions
Fire-fighting
Laminates
Refractory materials
Informative references
Attention is drawn to the following places, which may be of interest for search:
Fireproof paints
Fireproofing of paper)
Fireproofing of polymers
C08
Fireproofing of textiles
Fireproofing of wood
Protection of cables
Protection of constructions against fire
Protection of pipes by means of non-inflammable material
Special rules of classification within this group

C09K relates to materials not provided elsewhere,

therefore

If the fire-proofing material is only claimed with regard to a particular application and if in said particular application field a class related to the chemical nature of the fireproofing material exists the document should only be classified in the application field

If no particular application of the fireproofing material is cited the document should only be classified in the appropriate C09K 21/00 group.

If the fireproofing material is claimed without particular uses the document should be classified in the appropriate C09K 21/00 group,

however

If particular applications are cited (e.g. in the description) the document should additionally be classified in the relevant application fields

and

if many different applications are cited the document should only be classified in the appropriate C09K 21/00 group.

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Last Modified: 10/11/2013