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Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K 26/00; desurfacing by applying flames B23K 7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C 1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25.
NOTE
-
protective layers or coating compositions or methods of applying them; these are classified in the appropriate places, e.g. B05, B44, C09D, C23C.

mechanical devices or constructional features of particular articles for inhibiting incrustation; these are classified in the appropriate places, e.g. in pipes or pipe fittings F16L 58/00.

articles characterised by being made of materials selected for their properties of resistance to corrosion or incrustation; these are classified in the appropriate places, e.g. turbine blades F01D 5/28.

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Etching metallic material by chemical means (manufacture of printing surfaces B41C; manufacture of printed circuits H05K)
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C23F 1/02
.
Local etching
C23F 1/04
. .
Chemical milling
C23F 1/06
.
Sharpening files
C23F 1/08
.
Apparatus, e.g. for photomechanical printing surfaces (photo- mechanical reproduction G03F)
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C23F 1/10
.
Etching compositions (C23F 1/44 takes precedence)
C23F 1/12
. .
Gaseous compositions
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C23F 1/14
. .
Aqueous compositions
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C23F 1/16
. . .
Acidic compositions (C23F 1/42 takes precedence)
C23F 1/18
. . . .
for etching copper or alloys thereof
C23F 1/20
. . . .
for etching aluminium or alloys thereof
C23F 1/22
. . . .
for etching magnesium or alloys thereof
C23F 1/26
. . . .
for etching refractory metals
C23F 1/28
. . . .
for etching iron group metals
C23F 1/30
. . . .
for etching other metallic material
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C23F 1/32
. . .
Alkaline compositions (C23F 1/42 takes precedence)
C23F 1/34
. . . .
for etching copper or alloys thereof
C23F 1/36
. . . .
for etching aluminium or alloys thereof
C23F 1/38
. . . .
for etching refractory metals
C23F 1/40
. . . .
for etching other metallic material
C23F 1/42
. . .
containing a dispersed water-immiscible liquid
C23F 1/44
.
Compositions for etching metallic material from a metallic material substrate of different composition
C23F 1/46
.
Regeneration of etching compositions
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Brightening metals by chemical means
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C23F 3/02
.
Light metals
C23F 3/03
. .
with acidic solutions
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C23F 3/04
.
Heavy metals
C23F 3/06
. .
with acidic solutions
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Processes for removing metallic material from surfaces, not provided for in group C23F 1/00 or C23F 3/00
C23F 4/02
.
by evaporation
C23F 4/04
.
by physical dissolution
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Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent (adding inhibitors to mineral oil, fuels, or lubricants C10; adding inhibitors to pickling solutions C23G)
C23F 11/02
.
in air or gases by adding vapour phase inhibitors
C23F 11/04
.
in markedly acid liquids
C23F 11/06
.
in markedly alkaline liquids
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C23F 11/08
.
in other liquids
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C23F 11/10
. .
using organic inhibitors
NOTE
-
A compound is classified in the last appropriate place.

Esters or anhydrides of organic acids are classified as the relevant acid unless otherwise indicated. Salts of a compound with an inorganic compound are classified as that compound unless specifically provided for.

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C23F 11/12
. . .
Oxygen-containing compounds
C23F 11/122
. . . .
Alcohols; Aldehydes; Ketones
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C23F 11/124
. . . .
Carboxylic acids
C23F 11/126
. . . . .
Aliphatic acids
C23F 11/128
. . . .
Esters of carboxylic acids
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C23F 11/14
. . .
Nitrogen containing compounds
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C23F 11/141
. . . .
Amines; Quaternary ammonium compounds
C23F 11/142
. . . . .
Hydroxy amines
C23F 11/143
. . . . .
Salts of amines
C23F 11/144
. . . .
Aminocarboxylic acids
C23F 11/145
. . . .
Amides; N-substituded amides
C23F 11/146
. . . .
containing a multiple nitrogen-to-carbon bond
C23F 11/147
. . . .
containing a nitrogen-to-oxygen bond
C23F 11/148
. . . .
containing a nitrogen-to-nitrogen bond
C23F 11/149
. . . .
Heterocyclic compounds containing nitrogen as hetero atom
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C23F 11/16
. . .
Sulfur containing compounds
C23F 11/161
. . . .
Mercaptans
C23F 11/162
. . . .
Thioaldehydes; Thioketones
C23F 11/163
. . . .
Sulfonic acids
C23F 11/164
. . . .
containing a -SO2-N group
C23F 11/165
. . . .
Heterocyclic compounds containing sulfur as hetero atom
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C23F 11/167
. . .
Phosphorus-containing compounds
C23F 11/1673
. . . .
Esters of phosphoric or thiophosphoric acids
C23F 11/1676
. . . .
Phosphonic acids
C23F 11/173
. . .
Macromolecular compounds
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C23F 11/18
. .
using inorganic inhibitors
C23F 11/181
. . .
Nitrogen containing compounds
C23F 11/182
. . .
Sulfur, boron or silicon containing compounds
C23F 11/184
. . .
Phosphorous, arsenic, antimony or bismuth containing compound
C23F 11/185
. . .
Refractory metal-containing compounds
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C23F 11/187
. . .
Mixtures of inorganic inhibitors
C23F 11/188
. . . .
containing phosphates
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Inhibiting corrosion of metals by anodic or cathodic protection
C23F 13/005
.
{
Anodic protection
}
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C23F 13/02
.
cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
C23F 13/04
. .
Controlling or regulating desired parameters
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C23F 13/06
. .
Constructional parts, or assemblies of cathodic-protection apparatus
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C23F 13/08
. . .
Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
C23F 13/10
. . . .
Electrodes characterised by the structure (C23F 13/16 takes precedence)
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C23F 13/12
. . . .
Electrodes characterised by the material (C23F 13/16 takes precedence)
C23F 13/14
. . . . .
Material for sacrificial anodes
C23F 13/16
. . . .
Electrodes characterised by the combination of the structure and the material
C23F 13/18
. . . .
Means for supporting electrodes
C23F 13/20
. . . .
Conducting electric current to electrodes
C23F 13/22
. . . .
Monitoring arrangements therefor
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Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes (adding scale preventives or removers to water C02F 5/00)
{
inhibiting incrustation in polymerisation reactors C23F 15/005
}
C23F 14/02
.
by chemical means
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Other methods of preventing corrosion or incrustation
C23F 15/005
.
{
Inhibiting incrustation
}
Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25(C23C 28/00 takes precedence)
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C23F 2201/00
Type of materials to be protected by cathodic protection
C23F 2201/02
.
Concrete, e.g. reinforced
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C23F 2213/00
Aspects of inhibiting corrosion of metals by anodic or cathodic protection
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C23F 2213/10
.
Controlling or regulating parameters
C23F 2213/11
. .
for structures subject to stray currents
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C23F 2213/20
.
Constructional parts or assemblies of the anodic or cathodic protection apparatus
C23F 2213/21
. .
combining at least two types of anodic or cathodic protection
C23F 2213/22
. .
characterized by the ionic conductor, e.g. humectant, hydratant or backfill
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C23F 2213/30
.
Anodic or cathodic protection specially adapted for a specific object
C23F 2213/31
. .
Immersed structures, e.g. submarine structures
C23F 2213/32
. .
Pipes
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013