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

  
METALLURGY
 C23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL (decorating textiles by metallising D06Q 1/04); CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (for specific applications, see the relevant places, e.g. for manufacturing resistors H01C 17/06); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL (treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D, C25F)  [2]
 C23

Note(s)

In this class, the following expression is used with the meaning incicated: [4]

  • "metallic material" covers[4]
    1. metals; [4]
    2. alloys, including: [4]
      1. alloys containing at least 50% by weight of one or more of borides, carbides, nitrides, oxides or silicides and binding metal; [4]
      2. non-ferrous alloys containing at least 5% by weight but less than 50% by weight of borides, carbides, nitrides, oxides or silicides of refractory metals, whether added as such or formed in situ[4]

 C23G
CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS (polishing compositions C09G; detergents in general C11D)
 C23G 1/00
Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02)
 C23G 1/02
·  with acid solutions
 C23G 1/04
·  ·  using inhibitors
 C23G 1/06
·  ·  ·  organic inhibitors
 C23G 1/08
·  ·  Iron or steel
 C23G 1/10
·  ·  Other heavy metals
 C23G 1/12
·  ·  Light metals
 C23G 1/14
·  with alkaline solutions
 C23G 1/16
·  ·  using inhibitors
 C23G 1/18
·  ·  ·  Organic inhibitors
 C23G 1/19
·  ·  Iron or steel  [4]
 C23G 1/20
·  ·  Other heavy metals
 C23G 1/22
·  ·  Light metals
 C23G 1/24
·  with neutral solutions
 C23G 1/26
·  ·  using inhibitors
 C23G 1/28
·  with molten salts
 C23G 1/30
·  ·  using inhibitors
 C23G 1/32
·  ·  Heavy metals
 C23G 1/34
·  ·  Light metals
 C23G 1/36
·  Regeneration of waste pickling liquors
 C23G 3/00
Apparatus for cleaning or pickling metallic material (with organic solvents C23G 5/04)
 C23G 3/02
·  for cleaning wires, strips, filaments continuously
 C23G 3/04
·  for cleaning pipes
 C23G 5/00
Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
 C23G 5/02 - 
C23G 5/06

Note(s)

In groups C23G 5/02-C23G 5/06, in the absence of an indication to the contrary, an invention is classified in the last appropriate place. [4]

 C23G 5/02
·  using organic solvents
 C23G 5/024
·  ·  containing hydrocarbons  [4]
 C23G 5/028
·  ·  containing halogenated hydrocarbons  [4]
 C23G 5/032
·  ·  containing oxygen-containing compounds  [4]
 C23G 5/036
·  ·  ·  having also nitrogen  [4]
 C23G 5/04
·  ·  Apparatus
 C23G 5/06
·  using emulsions  [4]