IPC CORRECTIONS
IPC Corrections Made By Derwent
As part of Derwent's rigorous editorial process, IPCs assigned by the Patent Offices are checked and corrected (or added) where necessary. In addition to informing the Patent Offices of these errors, we have consolidated all the previous lists into a single searchable database.
If you wish to check for corrected IPCs, please enter the patent number in the field below.
Examples patent number formats: US6166924, US2001/0018406, WO01/00350, WO98/42642, or enter a two letter country code e.g. WO or US to retrieve all patent numbers for those countries.
You can access full listings of International Patent Classifications at the World Intellectual Property Organization website.