The Derwent Patents Citation Index is a unique collection of patent and literature citations from 32 patent authorities with superior data quality. Backward and forward patent citations are being enriched with Derwent value-added content, like Derwent patent assignee codes, which is extremely useful for comprehensive citation analysis. An elaborated set of citation counts supports users to identify inventions of high technological relevance. Powerful display options ensure the most efficient analysis of citation search results. Citation information is made available on two different levels of detail: each Derwent family record is associated with a de-duplicated set of citations, while individual publications are linked to the full citation information.