USPC-IPC Correspondence

The USPC and IPC systems were harmonized using the concordance provided by ReedTech at http://patents.reedtech.com/classdata.php. In order to simplify the classification of patents, we compared all IPCs found in the OECD's database to the USPTO classes liked in ReedTech's concordance table and assigned them to the appropriate USPTO label. 2 columns, 183K lines, "|" delimited; the columns are:--USPC: the USPC--IPC: the IPCs that are found in our database that are equivalent to that USPC. If more than one IPC is equivalent, they are separated by a ",".