CPC Combination Sets are now completely available in Derwent World Patents Index
CPC combination sets are groups of CPC symbols linking multiple features of an invention. Patent examiners assign these combination sets in special technical fields to classify different aspects of the main inventive feature. Since July 2017, CPC combination sets have been made available for DWPI updates, while backfile data have been included in the course of 2018. This powerful CPC feature can now be used for more than 1 million DWPI records (2019/02).