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Dernière mise à jour: 15.9.2015
Patent databases contain a wealth of information about technology, and with 90 million patent documents the EPO's Espacenet worldwide database is one of the largest collections of technical information in the world. To make searching easier, patent applications are classified by technical area.
Here we look at current issues in patent classification, including the tagging schemes developed by the EPO to identify technologies that span multiple technical fields.