Report:Delphion/Data Coverage/Patent Coverage/Citation Coverage
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|DWPI on Delphion is no longer available, as of March 31, 2012. DWPI data is available on the Thomson Innovation platform.|
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.
Delphion’s citation coverage extends to both patent and non-patent citations. Regarding patent data, the system displays both backward citations found on the patent itself, and forward citations (created when a new document cites an older patent). As an added benefit, some non-patent citations are linked to their ISI Web of Science abstracts through Delphion, at no additional charge. For more information about non-patent citations on patent documents, see the ISI Web of Science section under the Non-Patent Coverage section of this article.
One disadvantage to Delphion’s citation search feature is the limitations of the patent citation coverage. Delphion only contains citation data from US search reports. Some foreign patents in the system will show the US documents that cite them; this occurs because a citation relationship has been established through the linking of the two documents, based on the citation data of the US patent. Although Delphion offers access to Derwent records, it is unlikely that data from the Derwent citation files is offered as part of the full-text search and display functions for data collected from the patent offices.
Echoing the format of citation data as it appears on US patents, Delphion places an emphasis on dividing US citation data from foreign data. On the record view screen, citations are divided into these two groups, rather than into forward and backward citation groups.