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
 C25
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR (electrodialysis, electro-osmosis, separation of liquids by electricity B01D; working of metal by the action of a high concentration of electric current B23H; surface treatment of metallic material or coating involving at least one process provided for in class C23 and at least one process covered by this class C23C 28/00, C23F 17/00; anodic or cathodic protection C23F; single-crystal growth 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)  [4]
 C25

Note(s)

  1. Inventions dealing with electrolytic or electrophoretic processes or apparatus or operational features are classified
    1. in the groups for the compounds or articles produced, and [2]
    2. in the groups which cover the apparatus or operational features. [2]
  2. The electrolytic or electrophoretic purification of materials is classified according to the nature of the liquid in the relevant places, e.g. A01K 63/00, C02F 1/46, C25B 15/08, C25D 21/16, C25F 7/02[2]
 C25D
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING (manufacturing printed circuits by metal deposition H05K 3/18); APPARATUS THEREFOR  [2]
 C25D 1/00
Electroforming  [2]
 C25D 1/02
·  Tubes; Rings; Hollow bodies  [2]
 C25D 1/04
·  Wires; Strips; Foils  [2]
 C25D 1/06
·  Wholly-metallic mirrors  [2]
 C25D 1/08
·  Perforated or foraminous objects, e.g. sieves (C25D 1/10 takes precedence)  [2]
 C25D 1/10
·  Moulds; Masks; Masterforms  [2]
 C25D 1/12
·  by electrophoresis  [2]
 C25D 1/14
·  ·  of inorganic material  [2]
 C25D 1/16
·  ·  ·  Metals  [2]
 C25D 1/18
·  ·  of organic material  [2]
 C25D 1/20
·  Separation of the formed objects from the electrodes  [2]
 C25D 1/22
·  ·  Separating compounds  [2]
 C25D 3/00
Electroplating; Baths therefor  [2]
 C25D 3/02
·  from solutions (C25D 5/24-C25D 5/32 take precedence)  [2]
 C25D 3/04
·  ·  of chromium  [2]
 C25D 3/06
·  ·  ·  from solutions of trivalent chromium  [2]
 C25D 3/08
·  ·  ·  Deposition of black chromium  [2]
 C25D 3/10
·  ·  ·  characterised by the organic bath constituents used  [2]
 C25D 3/12
·  ·  of nickel or cobalt  [2]
 C25D 3/14
·  ·  ·  from baths containing acetylenic or heterocyclic compounds  [2]
 C25D 3/16
·  ·  ·  ·  Acetylenic compounds  [2]
 C25D 3/18
·  ·  ·  ·  Heterocyclic compounds  [2]
 C25D 3/20
·  ·  of iron  [2]
 C25D 3/22
·  ·  of zinc  [2]
 C25D 3/24
·  ·  ·  from cyanide baths  [2]
 C25D 3/26
·  ·  of cadmium  [2]
 C25D 3/28
·  ·  ·  from cyanide baths  [2]
 C25D 3/30
·  ·  of tin  [2]
 C25D 3/32
·  ·  ·  characterised by the organic bath constituents used  [2]
 C25D 3/34
·  ·  of lead  [2]
 C25D 3/36
·  ·  ·  characterised by the organic bath constituents used  [2]
 C25D 3/38
·  ·  of copper  [2]
 C25D 3/40
·  ·  ·  from cyanide baths  [2]
 C25D 3/42
·  ·  of light metals  [2]
 C25D 3/44
·  ·  ·  Aluminium  [2]
 C25D 3/46
·  ·  of silver  [2]
 C25D 3/48
·  ·  of gold  [2]
 C25D 3/50
·  ·  of platinum group metals  [2]
 C25D 3/52
·  ·  ·  characterised by the organic bath constituents used  [2]
 C25D 3/54
·  ·  of metals not provided for in groups C25D 3/04-C25D 3/50  [2]
 C25D 3/56
·  ·  of alloys  [2]
 C25D 3/58
·  ·  ·  containing more than 50% by weight of copper  [2]
 C25D 3/60
·  ·  ·  containing more than 50% by weight of tin  [2]
 C25D 3/62
·  ·  ·  containing more than 50% by weight of gold  [2]
 C25D 3/64
·  ·  ·  containing more than 50% by weight of silver  [2]
 C25D 3/66
·  from melts  [2]
 C25D 5/00
Electroplating characterised by the process; Pretreatment or after-treatment of workpieces  [2]
 C25D 5/02
·  Electroplating of selected surface areas  [2]
 C25D 5/04
·  Electroplating with moving electrodes  [2]
 C25D 5/06
·  ·  Brush or pad plating  [2]
 C25D 5/08
·  Electroplating with moving electrolyte, e.g. jet electroplating  [2]
 C25D 5/10
·  Electroplating with more than one layer of the same or of different metals (for bearings C25D 7/10)  [2]
 C25D 5/12
·  ·  at least one layer being of nickel or chromium  [2]
 C25D 5/14
·  ·  ·  two or more layers being of nickel or chromium, e.g. duplex or triplex layers  [2]
 C25D 5/16
·  Electroplating with layers of varying thickness  [2]
 C25D 5/18
·  Electroplating using modulated, pulsed or reversing current  [2]
 C25D 5/20
·  Electroplating using ultrasonics  [2]
 C25D 5/22
·  Electroplating combined with mechanical treatment during the deposition  [2]
 C25D 5/24
·  Electroplating of metal surfaces to which a coating cannot readily be applied (C25D 5/34 takes precedence)  [2]
 C25D 5/26
·  ·  of iron or steel surfaces  [2]
 C25D 5/28
·  ·  of surfaces of refractory metals  [2]
 C25D 5/30
·  ·  of surfaces of light metals  [2]
 C25D 5/32
·  ·  of surfaces of actinides  [2]
 C25D 5/34
·  Pretreatment of metallic surfaces to be electroplated  [2]
 C25D 5/36
·  ·  of iron or steel  [2]
 C25D 5/38
·  ·  of refractory metals or nickel  [2]
 C25D 5/40
·  ·  ·  Nickel; Chromium  [2]
 C25D 5/42
·  ·  of light metals  [2]
 C25D 5/44
·  ·  ·  Aluminium  [2]
 C25D 5/46
·  ·  of actinides  [2]
 C25D 5/48
·  After-treatment of electroplated surfaces  [2]
 C25D 5/50
·  ·  by heat-treatment  [2]
 C25D 5/52
·  ·  by brightening or burnishing  [2]
 C25D 5/54
·  Electroplating of non-metallic surfaces (C25D 7/12 takes precedence)  [2]
 C25D 5/56
·  ·  of plastics  [2]
 C25D 7/00
Electroplating characterised by the article coated  [2]
 C25D 7/02
·  Slide fasteners  [2]
 C25D 7/04
·  Tubes; Rings; Hollow bodies  [2]
 C25D 7/06
·  Wires; Strips; Foils  [2]
 C25D 7/08
·  Mirrors; Reflectors  [2]
 C25D 7/10
·  Bearings  [2]
 C25D 7/12
·  Semiconductors  [2]
 C25D 9/00
Electrolytic coating other than with metals (C25D 11/00, C25D 15/00 take precedence; eletrophoretic coating C25D 13/00)  [2]
 C25D 9/02
·  with organic materials  [2]
 C25D 9/04
·  with inorganic materials  [2]
 C25D 9/06
·  ·  by anodic processes  [2]
 C25D 9/08
·  ·  by cathodic processes  [2]
 C25D 9/10
·  ·  ·  on iron or steel  [2]
 C25D 9/12
·  ·  ·  on light metals  [2]
 C25D 11/00
Electrolytic coating by surface reaction, i.e. forming conversion layers  [2]
 C25D 11/02
·  Anodisation  [2]
 C25D 11/04
·  ·  of aluminium or alloys based thereon  [2]
 C25D 11/06
·  ·  ·  characterised by the electrolytes used  [2]
 C25D 11/08
·  ·  ·  ·  containing inorganic acids  [2]
 C25D 11/10
·  ·  ·  ·  containing organic acids  [2]
 C25D 11/12
·  ·  ·  Anodising more than once, e.g. in different baths  [2]
 C25D 11/14
·  ·  ·  Producing integrally coloured layers  [2]
 C25D 11/16
·  ·  ·  Pretreatment  [2]
 C25D 11/18
·  ·  ·  After-treatment, e.g. pore-sealing (lacquering B44D)  [2]
 C25D 11/20
·  ·  ·  ·  Electrolytic after-treatment  [2]
 C25D 11/22
·  ·  ·  ·  ·  for colouring layers  [2]
 C25D 11/24
·  ·  ·  ·  Chemical after-treatment  [2]
 C25D 11/26
·  ·  of refractory metals or alloys based thereon  [2]
 C25D 11/28
·  ·  of actinides or alloys based thereon  [2]
 C25D 11/30
·  ·  of magnesium or alloys based thereon  [2]
 C25D 11/32
·  ·  of semiconducting materials  [2]
 C25D 11/34
·  ·  of metals or alloys not provided for in groups C25D 11/04-C25D 11/32  [2]
 C25D 11/36
·  Phosphatising  [2]
 C25D 11/38
·  Chromatising  [2]
 C25D 13/00
Electrophoretic coating (C25D 15/00 takes precedence; apparatus for continuously conveying articles into baths B65G, e.g. B65G 49/00; compositions for electrophoretic coating C09D 5/44)  [2]
 C25D 13/02
·  with inorganic material  [2]
 C25D 13/04
·  with organic material  [2]
 C25D 13/06
·  ·  polymers  [2]
 C25D 13/08
·  ·  ·  by polymerisation in situ of monomeric materials  [2]
 C25D 13/10
·  characterised by the additives used  [2]
 C25D 13/12
·  characterised by the article coated  [2]
 C25D 13/14
·  ·  Tubes; Rings; Hollow bodies  [2]
 C25D 13/16
·  ·  Wires; Strips; Foils  [2]
 C25D 13/18
·  using modulated, pulsed or reversing current  [2]
 C25D 13/20
·  Pretreatment  [2]
 C25D 13/22
·  Servicing or operating  [2]
 C25D 13/24
·  ·  Regeneration of process liquids  [2]
 C25D 15/00
Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires  [2]
 C25D 15/02
·  Combined electrolytic and electrophoretic processes  [2]
 C25D 17/00
Constructional parts, or assemblies thereof, of cells for electrolytic coating (apparatus for continuously conveying articles into baths B65G, e.g. B65G 49/00; electric devices, see the relevant places, e.g. H01B, H02G)  [2]
 C25D 17/02
·  Tanks; Installations therefor  [2]
 C25D 17/04
·  ·  External supporting frames or structures  [2]
 C25D 17/06
·  Suspending or supporting devices for articles to be coated  [2]
 C25D 17/08
·  ·  Racks  [2]
 C25D 17/10
·  Electrodes  [2]
 C25D 17/12
·  ·  Shape or form (C25D 17/14 takes precedence)  [2]
 C25D 17/14
·  ·  for pad-plating  [2]
 C25D 17/16
·  Apparatus for electrolytic coating of small objects in bulk  [2]
 C25D 17/18
·  ·  having closed containers  [2]
 C25D 17/20
·  ·  ·  Horizontal barrels  [2]
 C25D 17/22
·  ·  having open containers  [2]
 C25D 17/24
·  ·  ·  Oblique barrels  [2]
 C25D 17/26
·  ·  ·  Oscillating baskets  [2]
 C25D 17/28
·  ·  with means for moving the objects individually through the apparatus during the treatment  [2]
 C25D 19/00
Electrolytic coating plants  [2]
 C25D 21/00
Processes for servicing or operating cells for electrolytic coating  [2]
 C25D 21/02
·  Heating or cooling  [2]
 C25D 21/04
·  Removal of gases or vapours  [2]
 C25D 21/06
·  Filtering  [2]
 C25D 21/08
·  Rinsing  [2]
 C25D 21/10
·  Agitating of electrolytes; Moving of racks  [2]
 C25D 21/11
·  Use of protective surface layers on electrolytic baths  [3]
 C25D 21/12
·  Process control or regulation (controlling or regulating in general G05)  [2]
 C25D 21/14
·  ·  Controlled addition of electrolyte components  [2]
 C25D 21/16
·  Regeneration of process solutions  [2]
 C25D 21/18
·  ·  of electrolytes (C25D 21/22 takes precedence)  [2]
 C25D 21/20
·  ·  of rinse-solutions (C25D 21/22 takes precedence)  [2]
 C25D 21/22
·  ·  by ion-exchange  [2]