Following the launch of the CPC International project on 24/25 August 2019, Espacenet now displays CPCI data. This means that the authorities that have assigned CPC classification symbols are now displayed next to each classification symbol (see screenshot below).
CPC symbols will continue to be propagated at family level, which means that every member of the simple patent family will display the same CPCI symbols in the bibliographic data view.
Use of the field identifier "cpc" in Smart search or the search field "CPC" in Advanced search will still search all documents that have been assigned the CPC symbol in question, independently of the assigning authorities.
Espacenet, however, now offers the possibility of searching for documents where CPC symbols have been assigned by specific authorities. Here are some examples of queries you can use for this purpose:
cpc=(C08F220/26 prox/unit=sentence EP)
cpc=(C08F220/38 prox/unit=sentence (US, EP))
cpc=(C08F220/26/low prox/unit=sentence (US, KR, EP))
cpcc=(C07C37/08 prox/unit=sentence (CN, EP, US))
cpcc=(C08F218/08 prox/unit=sentence (C08F220/06, US, EP))
You may recall that when the "cpc" field identifier is used, "/low" can be added at the end of the classification symbol to include all children (i.e. sub-classification levels) in the search. /low is only needed at subgroup levels, e.g. C08F220/26/low. Up to the main group level, e.g. C08, C08F or C08F 220, the data is auto-posted, which means that all sub-levels are automatically searched at the same time. When searching for combination sets (the "cpcc" field identifier), use of "/low" is not supported.