In section C, the definitions of groups of chemical elements are as follows:
Alkali metals: Li, Na, K, Rb, Cs, Fr
Alkaline earth metals: Ca, Sr, Ba, Ra
Lanthanides: elements with atomic numbers 57 to 71 inclusive
Rare earths: Sc, Y, Lanthanides
Actinides: elements with atomic numbers 89 to 103 inclusive
Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
Halogens: F, Cl, Br, I, At
Noble gases: He, Ne, Ar, Kr, Xe, Rn
Platinum group: Os, Ir, Pt, Ru, Rh, Pd
Noble metals: Ag, Au, Platinum group
Light metals: alkali metals, alkaline earth metals, Be, Al, Mg
Heavy metals: metals other than light metals
Iron group: Fe, Co, Ni
Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens
Metals: elements other than non-metals
Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards
Section C covers :
pure chemistry, which covers inorganic compounds, organic compounds, macromolecular compounds, and their methods of preparation;
applied chemistry, which covers compositions containing the above compounds, such as: glass, ceramics, fertilisers, plastics compositions, paints, products of the petroleum industry. It also covers certain compositions on account of their having particular properties rendering them suitable for certain purposes, as in the case of explosives, dyestuffs, adhesives, lubricants, and detergents;
certain marginal industries, such as the manufacture of coke and of solid or gaseous fuels, the production and refining of oils, fats and waxes, the fermentation industry (e.g., brewing and wine-making), the sugar industry;
certain operations or treatments, which are either purely mechanical, e.g., the mechanical treatment of leather and skins, or partly mechanical, e.g., the treatment of water or the prevention of corrosion in general;
metallurgy, ferrous or non-ferrous alloys.
In all sections of the IPC, in the absence of an indication to the contrary, the Periodic System of chemical elements referred to is the one with 8 groups as represented in the table below. For example, group Fulltext... Hierarchy... Expanded...C07F 3/00 "Compounds containing elements of the 2nd Group of the Periodic System" refers to the elements of columns IIa and IIb. [2009.01]
In the case of operations, treatments, products or articles having both a chemical and a non-chemical part or aspect, the general rule is that the chemical part or aspect is covered by section C.
In some of these cases, the chemical part or aspect brings with it a non-chemical one, even though purely mechanical, because this latter aspect either is essential to the operation or treatment or constitutes an important element thereof. It has seemed, in fact, more logical not to dissociate the different parts or aspects of a coherent whole. This is the case for applied chemistry and for the industries, operations and treatments mentioned in Notes (1)(c), (d) and (e). For example, furnaces peculiar to the manufacture of glass are covered by class Fulltext... Hierarchy... Expanded...C03 and not by class Fulltext... Hierarchy... Expanded...F27.
There are, however, some exceptions in which the mechanical (or non-chemical) aspect carries with it the chemical aspect, for example:
Photographic materials and processes, in class Fulltext... Hierarchy... Expanded...G03, and, generally, the chemical treatment of textiles and the production of cellulose or paper, in section D.
In still other cases, the pure chemical aspect is covered by section C and the applied chemical aspect by another section, such as A, B or F, e.g., the use of a substance or composition for:
When the chemical and mechanical aspects are so closely interlocked that a neat and simple division is not possible, or when certain mechanical processes follow as a natural or logical continuation of a chemical treatment, section C may cover, in addition to the chemical aspect, a part only of the mechanical aspect, e.g., after-treatment of artificial stone, covered by class Fulltext... Hierarchy... Expanded...C04. In this latter case, a note or a reference is usually given to make the position clear, even if sometimes the division is rather arbitrary.
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON (manufacture or treatment of artificial threads, fibres, bristles or ribbons Fulltext... Hierarchy... Expanded...D01)
C08
Note(s)
Biocidal, pest repellant, pest attractant or plant growth regulatory activity of compounds or preparations is further classified in subclass Fulltext... Hierarchy... Expanded...A01P. [8]
Processes using enzymes or micro-organisms in order to:
liberate, separate or purify a pre-existing compound or composition, or to
treat textiles or clean solid surfaces of materials
ammonium salts are classified in the same way as metal salts. [2]
In this subclass, any ingredient of a mixture which is not identified by the classification according to Note (2) above, and the use of which is determined to be novel and non-obvious, must also be classified in this subclass according to Note (1). The ingredient can be either a single compound or a composition in itself. [8]
Any ingredient of a mixture which is not identified by the classification according to Notes (2) or (3) above, and which is considered to represent information of interest for search, may also be classified in this subclass according to Note (1). This can, for example, be the case when it is considered of interest to enable searching of mixtures using a combination of classification symbols. Such non-obligatory classification should be given as "additional information". [8]
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Nitrogen-containing compounds [2]
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Phosphorus-containing compounds [2]
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Silicon-containing compounds [2]
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Silica [2]
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Boron-containing compounds [2]
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Glass [2]
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aromatic [2]
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Polyhydroxylic alcohols [6]
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Metal alcoholates [6]
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Aldehydes; Ketones [2]
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Quinones [2]
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Polycarboxylic acids [6]
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Carboxylic acids containing halogens [6]
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Cyclic anhydrides [7]
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Amines; Quaternary ammonium compounds [2]
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Quaternary ammonium compounds [2]
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Carboxylic acid amides [2]
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Compounds containing groups, e.g. carbamates [6]
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Urea; Derivatives thereof, e.g. biuret [2]
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Azo-compounds [2]
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Carboxylic acid hydrazides [2]
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Semicarbazides [2]
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Piperidines [5]
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condensed with carbocyclic rings [5]
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Five-membered rings [5]
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Triazines [5]
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containing heterocyclic rings [6,7]
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Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates [2]
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Thioureas; Derivatives thereof [6]
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Compounds containing sulfur bound to oxygen [2]
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Sulfonic acids; Derivatives thereof [2]
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Sulfenamides [2]
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Thiazoles [2]
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Phosphorus bound to carbon only [2,5]
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bound to oxygen only [2]
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with hydroxyaryl compounds [5]
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Esters of phosphorous acids, e.g. of H3PO3 [5]
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with hydroxyaryl compounds [5]
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Cyclic esters [5]
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Esters containing heterocyclic rings not representing cyclic esters of phosphoric or phosphorous acids [5]
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bound to oxygen and to carbon only [2,5]
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Phosphinic compounds, e.g. R2=P(:O)OR' [5]
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Phosphonic compounds, e.g. R—P(:O)(OR')2 [5]
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Esters of phosphonic acids [5]
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containing also halogens [5]
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containing also nitrogen [5]
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cyclic [5]
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Phosphinous compounds, e.g. R2=P—OR' [5]
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Phosphonous compounds, e.g. R—P(OR')2 [5]
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containing oxygen [7]
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containing at least one Si—O bond [7]
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containing at least one Si—C bond [7]
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containing oxygen in a ring [7]
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containing nitrogen [7]
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containing at least one Si—N bond [7]
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containing at least one group [7]
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containing at least one C=N bond [7]
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containing at least one CN bond [7]
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containing sulfur [7]
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containing silicon in a ring [7]
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Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond [2]
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Organo-tin compounds [2]
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inorganic [2]
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Asbestos [2]
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inorganic [2]
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with silicon-containing compounds [2]
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