C
SECTION C — CHEMISTRY; METALLURGY
 C

Note(s)

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

The following notes are meant to assist in the use of this part of the classification scheme; they must not be read as modifying in any way the elaborations.

  1. 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 of it; 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
 C10
PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
 C10H
PRODUCTION OF ACETYLENE BY WET METHODS (purification of acetylene C07C 11/24)  [5]
 C10H 1/00
Acetylene gas generators with dropwise, gravity, non-automatic water feed (valves, cocks, per se, F16K)
 C10H 1/02
·  Valves
 C10H 1/04
·  ·  Screw valves
 C10H 1/06
·  ·  Cocks
 C10H 1/08
·  Other means for controlling the water feed
 C10H 1/10
·  Water feed from above through a central or lateral pipe
 C10H 1/12
·  Water feed from above through porous materials
 C10H 3/00
Acetylene gas generators with automatic water feed regulation by means independent of the gas-holder
 C10H 3/02
·  with membranes
 C10H 3/04
·  with floats
 C10H 3/06
·  with pistons
 C10H 5/00
Acetylene gas generators with automatic water feed regulation by the gas-holder
 C10H 5/02
·  with overflow for the water
 C10H 5/04
·  by drop-by-drop water valves connected with the gas-holder
 C10H 5/06
·  ·  by drop-by-drop water cocks connected with the gas-holder
 C10H 5/08
·  with gas-holder-connected water valves or cocks according to the submersion system
 C10H 7/00
Acetylene gas generators with water feed by Kipp's principle
 C10H 7/02
·  with water feed from below
 C10H 7/04
·  with water feed from above
 C10H 9/00
Acetylene gas generators according to Dobereiner's principle with fixed carbide bell
 C10H 9/02
·  with water feed from below through porous materials (by capillary feed)
 C10H 9/04
·  with gas cock actuated by the gas-holder
 C10H 9/06
·  with the depth of the gas outlet pipe regulated by the gas-holder
 C10H 9/08
·  with movable gas-holder
 C10H 9/10
·  by wetting the carbide only at the bottom
 C10H 11/00
Acetylene gas generators with submersion of the carbide in water
 C10H 11/02
·  inside the gas-holder
 C10H 11/04
·  with sealing and reaction water separated from each other
 C10H 13/00
Acetylene gas generators with combined dipping and drop-by-drop system
 C10H 15/00
Acetylene gas generators with carbide feed, with or without regulation by the gas pressure
 C10H 15/02
·  with non-automatic carbide feed
 C10H 15/04
·  ·  Closure means at the filling-hopper
 C10H 15/06
·  with automatic carbide feed by valves
 C10H 15/08
·  ·  by flap or slide valves
 C10H 15/10
·  ·  by float valves
 C10H 15/12
·  ·  by measuring valves, including pocket-wheels
 C10H 15/14
·  with feed worm or feed conveyers
 C10H 15/16
·  with feed drums
 C10H 15/18
·  with movable feed disc and fixed carbide-receptacle
 C10H 15/20
·  with carbide feed by cartridges or other packets
 C10H 15/22
·  with carbide feed of pulverous carbide from receptacles or through the gas-holder
 C10H 15/24
·  with carbide feed by pistons
 C10H 17/00
High-pressure acetylene gas generators
 C10H 19/00
Other acetylene gas generators
 C10H 19/02
·  Rotary carbide receptacles
 C10H 21/00
Details of acetylene generators; Accessory equipment for, or features of, the wet production of acetylene
 C10H 21/02
·  Packages of carbide for use in generators, e.g. cartridges
 C10H 21/04
·  ·  Placing packages in the generator
 C10H 21/06
·  ·  ·  Opening devices for packages in the generator
 C10H 21/08
·  Safety devices for acetylene generators
 C10H 21/10
·  Carbide compositions
 C10H 21/12
·  Gas-tight sealing means, e.g. liquid seals in generators
 C10H 21/14
·  Ventilation means; Cooling devices
 C10H 21/16
·  Removing sludge from generators
 C10H 23/00
( transferred to C07C 11/24 )