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]

 C23D
ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS (chemical composition of the enamels C03C)
 C23D 1/00
Melting or fritting the enamels; Apparatus or furnaces therefor
 C23D 1/02
·  Granulating the melt; Drying the granules
 C23D 3/00 - 
C23D 7/00
Coating with the enamels
 C23D 3/00
Chemical treatment of the metal surfaces prior to coating (cleaning or de-greasing of metallic objects C23G)
 C23D 5/00
Coating with enamels or vitreous layers
 C23D 5/02
·  by wet methods
 C23D 5/04
·  by dry methods
 C23D 5/06
·  producing designs or letters
 C23D 5/08
·  Applying enamels non-uniformly over the surface
 C23D 5/10
( transferred to C23C )
 C23D 7/00
Treating the coatings, e.g. drying before burning
 C23D 9/00 - 
C23D 11/00
Firing the enamels
 C23D 9/00
Ovens specially adapted for firing enamels
 C23D 9/02
·  Non-electric muffle furnaces
 C23D 9/04
·  Non-electric tunnel ovens
 C23D 9/06
·  Electric furnaces
 C23D 9/08
·  Supporting devices for burning-bars
 C23D 9/10
·  Loading or unloading devices
 C23D 11/00
Continuous processes; Apparatus therefor
 C23D 13/00 - 
C23D 17/00
After-treatment
 C23D 13/00
After-treatment of the enamelled articles
 C23D 13/02
·  Removing defects by local re-melting of the enamel; Adjusting the shape
 C23D 15/00
Joining enamelled articles to other enamelled articles by processes involving an enamelling step
 C23D 17/00
De-enamelling