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Classification CPC - we only need the main one
CPC is a classification scheme set up by the USPTO and the European Patent Office (EPO). The first classification codes rolled out on November 9, 2012.[http://www.cooperativepatentclassification.org/cpcSchemeAndDefinitions.html] Full implementation of the CPC classification system occurred on January 2015, at the same time of version 4.5 of the USPTO patent bulk data.[http://www.uspto.gov/sites/default/files/about/advisory/ppac/120927-09a-international_cpc.pdf]
*Section, Class, Subclass
