Report:Google Patent Search/Data Coverage/Patent Coverage/Citation Coverage
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For the purpose of this article, the term "citation" refers to a patent citation. To get more information on how we use the term citation, please see the citations article.
Google Patents does contain citation records. Backward citation information is obtained by scanning the data present on patent front pages; in addition, the system allows users to view and investigate the forward US citations for a particular patent. Google Patents constructs this data by taking the scanned citation data printed on the front of the patent documents, and creating forward and backward hyperlinked citation relationships from this information.
For more information, see Viewing Patent Citations.