C
SECTION C — CHEMISTRY AND METALLURGY
 C

Note(s)

Definitions for Section C:

  • 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
 C25
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR (electrodialysis, electro-osmosis, separation of liquids by electricity B01D; electrolytic machining B23P; electroless, i. e. chemical, plating C23C; anodic or cathodic protection C23F; electrolytic production of single crystals C30B; electrochemical methods of analysis G01N; electrochemical measuring, indicating or recording devices G01R; electrolytic circuit elements, e.g. capacitors, H01G; electrochemical current or voltage generators H01M)  [2]
 C25

Note(s)

  1. Inventions dealing with electrolytic or electrophoretic processes and apparatus or operational features are classified (a) under the groups for the compounds or articles produced, and (b) under the groups provided for the apparatus or operational features. [2]
  2. The electrolytic or eletrophoretic purification of liquids is classified in the classes appropriate to the nature of the liquid, e.g. A01K 63/00, C02F 1/46, C25B 15/08, C25D 21/16, C25F 7/02[2]
 C25C
PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR  [2]
 C25C 1/00
Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence)  [2]
 C25C 1/02
·  of light metals  [2]
 C25C 1/04
·  ·  in mercury cathode cells  [2]
 C25C 1/06
·  of iron group metals or refractory metals  [2]
 C25C 1/08
·  ·  of nickel or cobalt  [2]
 C25C 1/10
·  ·  of chromium or manganese  [2]
 C25C 1/12
·  of copper  [2]
 C25C 1/14
·  of tin  [2]
 C25C 1/16
·  of zinc, cadmium or mercury  [2]
 C25C 1/18
·  of lead  [2]
 C25C 1/20
·  of noble metals  [2]
 C25C 1/22
·  of metals not provided for in groups C25C 1/02-C25C 1/20  [2]
 C25C 1/24
·  Alloys obtained by cathodic reduction of all their ions  [2]
 C25C 3/00
Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence)  [2]
 C25C 3/02
·  of alkali or alkaline earth metals  [2]
 C25C 3/04
·  of magnesium  [2]
 C25C 3/06
·  of aluminium  [2]
 C25C 3/08
·  ·  Cell construction, e.g. bottoms, walls  [2]
 C25C 3/10
·  ·  ·  External supporting frames or structures  [2]
 C25C 3/12
·  ·  ·  Anodes  [2]
 C25C 3/14
·  ·  Devices for feeding or crust breaking  [2]
 C25C 3/16
·  ·  Electric current supply devices, e.g. bus bars  [2]
 C25C 3/18
·  ·  Electrolytes  [2]
 C25C 3/20
·  ·  Automatic control or regulation of cells (controlling or regulating per se G05)  [2]
 C25C 3/22
·  ·  Collecting emitted gases  [2]
 C25C 3/24
·  ·  Refining  [2]
 C25C 3/26
·  of titanium, zirconium, hafnium, tantalum or vanadium  [2]
 C25C 3/28
·  ·  of titanium  [2]
 C25C 3/30
·  of manganese  [2]
 C25C 3/32
·  of chromium  [2]
 C25C 3/34
·  of metals not provided for in groups C25C 3/02-C25C 3/32  [2]
 C25C 3/36
·  Alloys obtained by cathodic reduction of all their ions  [2]
 C25C 5/00
Electrolytic production, recovery or refining of metal powders or porous metal masses  [2]
 C25C 5/02
·  from solutions  [2]
 C25C 5/04
·  from melts  [2]
 C25C 7/00
Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells (for the production of aluminium C25C 3/06-C25C 3/22)  [2]
 C25C 7/02
·  Electrodes (consumable anodes for the refining of metals C25C 1/00-C25C 5/00); Connections thereof  [2]
 C25C 7/04
·  Diaphragms; Spacing elements  [2]
 C25C 7/06
·  Operating or servicing  [2]
 C25C 7/08
·  ·  Separating of deposited metals from the cathode  [2]