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
 C30
CRYSTAL GROWTH (separation by crystallisation in general B01D 9/00)  [3]
 C30B
SINGLE-CRYSTAL GROWTH (by using ultra-high pressure, e.g. for the formation of diamonds B01J 3/06); UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIALS OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIALS; AFTER-TREATMENT OF SINGLE CRYSTALS (for producing semiconductor devices or parts thereof H01L); DOPING PROCESSES FOR CRYSTALS IN GENERAL (for producing semiconductor devices or parts thereof H01L); REFINING BY ZONE-MELTING OF MATERIALS IN GENERAL (zone-refining of metals or alloys C22B); APPARATUS THEREFOR  [3]
 C30B

Note(s)

  1. In this subclass, the following expression is used with the meaning indicated:
    • "single crystal" includes also twin crystals and a predominantly single crystal product. [3]
  2. In this subclass:
    • inventions dealing with the preparation of single crystals of particular materials or shapes are classified in the group for the process as well as in group C30B 29/00[3]
    • an apparatus specially adapted for a specific process is classified in the appropriate group for the process. Apparatus to be used in more than one kind of process is classified in group C30B 35/00[3]