C
SECTION C — CHEMISTRY; METALLURGY
 C

Note(s)

  1. 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

  2. Section C covers:
    1. pure chemistry, which covers inorganic compounds, organic compounds, macromolecular compounds, and their methods of preparation;
    2. 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;
    3. 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;
    4. 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;
    5. metallurgy, ferrous or non-ferrous alloys.
    1. 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.
    2. 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 C03 and not by class F27.
    3. There are, however, some exceptions in which the mechanical (or non-chemical) aspect carries with it the chemical aspect, for example:
    4. 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:
    5. 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 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.
  
CHEMISTRY
 C01
INORGANIC CHEMISTRY (processing powders of inorganic compounds preparatory to the manufacturing of ceramic products C04B 35/00; fermentation or enzyme-using processes for the preparation of elements or inorganic compounds except carbon dioxide C12P 3/00; obtaining metal compounds from mixtures, e.g. ores, which are intermediate compounds in a metallurgical process for obtaining a free metal C21B, C22B; production of non-metallic elements or inorganic compounds by electrolysis or electrophoresis C25B)
 C01

Note(s)

  1. In subclasses C01B-C01G, and within each of these subclasses, in the absence of an indication to the contrary, a compound is classified in the last appropriate place, e.g. potassium permanganate is classified only as a permanganate compound, in subclass C01G[3]
  2. Biocidal, pest repellant, pest attractant or plant growth regulatory activity of compounds or preparations is further classified in subclass A01P[8]
  3. Processes using enzymes or micro-organisms in order to: [5]
    1. liberate, separate or purify a pre-existing compound or composition, or to
    2. treat textiles or clean solid surfaces of materials
    are further classified in subclass C12S[5]
 C01G
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides C01B 6/00; salts of oxyacids of halogens C01B 11/00; peroxides, salts of peroxyacids C01B 15/00; thiosulfates, dithionites, polythionates C01B 17/64; compounds containing selenium or tellurium C01B 19/00; binary compounds of nitrogen with metals C01B 21/06; azides C01B 21/08; metal amides C01B 21/092; nitrites C01B 21/50; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; carbides C01B 31/30; compounds containing silicon C01B 33/00; compounds containing boron C01B 35/00; compounds having molecular sieve properties but not having base-exchange properties C01B 37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B 39/00; cyanides C01C 3/08; salts of cyanic acid C01C 3/14; salts of cyanamide C01C 3/16; thiocyanates C01C 3/20)
 C01G

Note(s)

  1. Attention is drawn to Note (1) after class C01, which defines the last place priority rule applied in this class, i.e. in the range of subclasses C01B-C01G and within these subclasses. [8]
  2. Therapeutic activity of compounds is further classified in subclass A61P[7]
 C01G
Subclass index
GENERAL METHODS OF PREPARATION 1/00
METALLIC COMPOUNDS, IN ALPHABETICAL ORDER OF THE SYMBOL FOR THE METAL
Ag Silver 5/00
As Arsenic 28/00
Au Gold 7/00
Bi Bismuth 29/00
Cd Cadmium 11/00
Co Cobalt 51/00
Cr Chromium 37/00
Cu Copper 3/00
Fe Iron 49/00
Ga Gallium 15/00
Ge Germanium 17/00
Hf Hafnium 27/00
Hg Mercury 13/00
In Indium 15/00
Ir Iridium 55/00
Mn Manganese 45/00
Mo Molybdenum 39/00
Nb Niobium 33/00
Ni Nickel 53/00
Os Osmium 55/00
Pb Lead 21/00
Pd Palladium 55/00
Pt Platinum 55/00
Re Rhenium 47/00
Rh Rhodium 55/00
Ru Ruthenium 55/00
Sb Antimony 30/00
Sn Tin 19/00
Ta Tantalum 35/00
Ti Titanium 23/00
Tl Thallium 15/00
U Uranium 43/00
V Vanadium 31/00
W Tungsten 41/00
Zn Zinc 9/00
Zr Zirconium 25/00
COMPOUNDS OF TRANSURANIC ELEMENTS 56/00
COMPOUNDS OF METALS NOT COVERED BY THE PRECEDING GROUPS 57/00
P:300 C01G 1/00
Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, C01F, in general (electrolytic production of inorganic compounds C25B 1/00)  [2]
 C01G 1/02
·  Oxides
 C01G 1/04
·  Carbonyls
 C01G 1/06
·  Halides
 C01G 1/08
·  Nitrates
 C01G 1/10
·  Sulfates
 C01G 1/12
·  Sulfides
 C01G 1/14
·  Sulfites
P:290 C01G 3/00
Compounds of copper
 C01G 3/02
·  Oxides; Hydroxides
 C01G 3/04
·  Halides
 C01G 3/05
·  ·  Chlorides  [3]
 C01G 3/06
·  ·  Oxychlorides
 C01G 3/08
·  Nitrates
 C01G 3/10
·  Sulfates
 C01G 3/12
·  Sulfides
 C01G 3/14
·  Complexes with ammonia
P:280 C01G 5/00
Compounds of silver
 C01G 5/02
·  Halides  [3]
P:270 C01G 7/00
Compounds of gold
P:260 C01G 9/00
Compounds of zinc
 C01G 9/02
·  Oxides; Hydroxides  [3]
 C01G 9/03
·  ·  Processes of production using dry methods, e.g. vapour phase processes  [3]
 C01G 9/04
·  Halides
 C01G 9/06
·  Sulfates
 C01G 9/08
·  Sulfides
P:250 C01G 11/00
Compounds of cadmium
 C01G 11/02
·  Sulfides  [3]
P:240 C01G 13/00
Compounds of mercury
 C01G 13/02
·  Oxides
 C01G 13/04
·  Halides
P:230 C01G 15/00
Compounds of gallium, indium, or thallium
P:220 C01G 17/00
Compounds of germanium
 C01G 17/02
·  Germanium dioxide
 C01G 17/04
·  Halides of germanium
P:210 C01G 19/00
Compounds of tin
 C01G 19/02
·  Oxides
 C01G 19/04
·  Halides
 C01G 19/06
·  ·  Stannous chloride
 C01G 19/08
·  ·  Stannic chloride
P:200 C01G 21/00
Compounds of lead
 C01G 21/02
·  Oxides
 C01G 21/04
·  ·  Lead suboxide (Pb2O)
 C01G 21/06
·  ·  Lead monoxide (PbO)
 C01G 21/08
·  ·  Lead dioxide (PbO2)
 C01G 21/10
·  ·  Red lead (Pb3O4)
 C01G 21/12
·  Hydroxides
 C01G 21/14
·  Carbonates
 C01G 21/16
·  Halides
 C01G 21/18
·  Nitrates
 C01G 21/20
·  Sulfates
 C01G 21/21
·  Sulfides  [3]
 C01G 21/22
·  Plumbates; Plumbites
P:190 C01G 23/00
Compounds of titanium
 C01G 23/02
·  Halides of titanium
 C01G 23/04
·  Oxides; Hydroxides  [3]
 C01G 23/047
·  ·  Titanium dioxide  [3]
 C01G 23/053
·  ·  ·  Producing by wet processes, e.g. hydrolysing titanium salts  [3]
 C01G 23/07
·  ·  ·  Producing by vapour phase processes, e.g. halide oxidation  [3]
 C01G 23/08
·  ·  ·  Drying; Calcining  [3]
P:180 C01G 25/00
Compounds of zirconium
 C01G 25/02
·  Oxides
 C01G 25/04
·  Halides
 C01G 25/06
·  Sulfates
P:170 C01G 27/00
Compounds of hafnium
 C01G 27/02
·  Oxides
 C01G 27/04
·  Halides
 C01G 27/06
·  Sulfates
P:160 C01G 28/00
Compounds of arsenic  [3]
 C01G 28/02
·  Arsenates; Arsenites  [3]
P:150 C01G 29/00
Compounds of bismuth
P:140 C01G 30/00
Compounds of antimony  [3]
 C01G 30/02
·  Antimonates; Antimonites  [3]
P:130 C01G 31/00
Compounds of vanadium
 C01G 31/02
·  Oxides  [3]
 C01G 31/04
·  Halides  [3]
P:120 C01G 33/00
Compounds of niobium
P:110 C01G 35/00
Compounds of tantalum
 C01G 35/02
·  Halides  [3]
P:100 C01G 37/00
Compounds of chromium
 C01G 37/02
·  Oxides or hydrates thereof
 C01G 37/027
·  ·  Chromium dioxide  [3]
 C01G 37/033
·  ·  Chromium trioxide; Chromic acid  [3]
 C01G 37/04
·  Chromium halides
 C01G 37/06
·  ·  Chromylhalides
 C01G 37/08
·  Chromium sulfates
 C01G 37/10
·  ·  Chrome alum
 C01G 37/14
·  Chromates; Bichromates
P:90 C01G 39/00
Compounds of molybdenum
 C01G 39/02
·  Oxides; Hydroxides  [3]
 C01G 39/04
·  Halides  [3]
 C01G 39/06
·  Sulfides  [3]
P:80 C01G 41/00
Compounds of tungsten
 C01G 41/02
·  Oxides; Hydroxides  [3]
 C01G 41/04
·  Halides  [3]
P:70 C01G 43/00
Compounds of uranium
 C01G 43/01
·  Oxides; Hydroxides  [3]
 C01G 43/025
·  ·  Uranium dioxide  [3]
 C01G 43/04
·  Halides of uranium
 C01G 43/06
·  ·  Fluorides
 C01G 43/08
·  ·  Chlorides
 C01G 43/10
·  ·  Bromides
 C01G 43/12
·  ·  Iodides
P:60 C01G 45/00
Compounds of manganese
 C01G 45/02
·  Oxides; Hydroxides
 C01G 45/04
·  Carbonyls
 C01G 45/06
·  Halides
 C01G 45/08
·  Nitrates
 C01G 45/10
·  Sulfates
 C01G 45/12
·  Manganates; Permanganates
P:50 C01G 47/00
Compounds of rhenium
P:40 C01G 49/00
Compounds of iron
 C01G 49/02
·  Oxides; Hydroxides
 C01G 49/04
·  ·  Ferrous oxide (FeO)
 C01G 49/06
·  ·  Ferric oxide (Fe2O3)
 C01G 49/08
·  ·  Ferroso-ferric oxide (Fe3O4)
 C01G 49/10
·  Halides
 C01G 49/12
·  Sulfides
 C01G 49/14
·  Sulfates
 C01G 49/16
·  Carbonyls
P:30 C01G 51/00
Compounds of cobalt
 C01G 51/02
·  Carbonyls
 C01G 51/04
·  Oxides; Hydroxides
 C01G 51/06
·  Carbonates
 C01G 51/08
·  Halides
 C01G 51/10
·  Sulfates
 C01G 51/12
·  Complexes with ammonia
P:20 C01G 53/00
Compounds of nickel
 C01G 53/02
·  Carbonyls
 C01G 53/04
·  Oxides; Hydroxides
 C01G 53/06
·  Carbonates
 C01G 53/08
·  Halides
 C01G 53/09
·  ·  Chlorides  [3]
 C01G 53/10
·  Sulfates
 C01G 53/11
·  Sulfides  [3]
 C01G 53/12
·  Complexes with ammonia
P:10 C01G 55/00
Compounds of ruthenium, rhodium, palladium, osmium, iridium, or platinum
P:0 C01G 56/00
Compounds of transuranic elements
P:310 C01G 57/00
Compounds of metals not covered elsewhere in this subclass