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ElementINIDDescription
classification-cpc52
Cooperative Patent Classification. Format is according to WIPO ST. 8. For more information on CPC, see Cooperative Patent Classification in IFI CLAIMS Direct. The full list of CPC codes can be found on the CPC website or the USPTO website.

When available, F and L symbols may indicate first and later classifications as in the following example: 

Code Block
languagexml
<classification-cpc mxw-id="PCL-1583949427" load-source="docdb" scheme="CPC">G01F1/6965 20130101 FI20130101BHEP </classification-cpc> 
<classification-cpc mxw-id="PCL-1583981588" load-source="docdb" scheme="CPC">G01F1/72 20130101 LI20130101BHEP </classification-cpc>

The different elements of CPC codes are described in the following table:

ElementPosition in WIPO/ST.8 DescriptionValues
classification symbol1sectionA…H and Y
2,3class01…99
4subclassA…Z
5 to 8main group1…9999 right-aligned
9separator/
10 to 15subgroup00…999999
scheme date20 to 27version indicatorYYYYMMDD
classification value30inventive (equivalent to ECLA)
additional (equivalent to ICO or EPO keywords)

I
A

action date31 to 38date indicating when the code was assignedYYYYMMDD
classification status39original
reclassified		B
R
data source40human
machine
generated		H
M
G
generating office41,42country code, only present for CPCNOstandard 2-character code based on WIPO ST.3
combination-sets

Group of CPC symbols that have one base class and one or more subsequent ranked symbols that are linked together to convey special classification information.

C-Sets classification is a special classification technique, providing a mechanism for searching combined features that are otherwise not easy to find by single symbols, resulting in more precise and efficient retrieval of technical information from CPC. 

A C-Set brings together symbols from different groups within the same subclass or from different subclasses, in a certain order. 

  • The first symbol is designated as the base symbol, and has the Rank 1 in the database. 
  • The second symbol is designated as the subsequent symbol, and has the Rank 2 in the database. 
  • Any further symbol, if present, is also designated as a subsequent symbol, and has the Rank 3 or higher in the database. 
  • At the end of the C-Set is the information value

Example of C-sets presentation in patent documents and in the CPC database:

C05C9/005,C05D9/02,C05G3/0058,INV
BaseSubsequentSubsequentInformation Value
Rank 1Rank 2Rank 3

Source: Guide to CPC (EPO and USPTO)

See https://www.cooperativepatentclassification.org/Training for more information.

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