CPC subclass reclassification

Three datasets are included, each corresponding to a different moment of CPC reclassification: 2013/2016, 2016/2019, 2019/2023. Each dataset includes the number of docdb patent families (with at least one US member and size greater than 1) of each subclass before reclassification (n), the number of classifications added (rp), and the number of classifications deleted (rn) for each earliest filing year between 1985 and 2019.