Derwent Patent Citation Index
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The coverage information from the Dialog Bluesheet for this file includes the following relevant excerpts (Patents Citation Index (342), accessed on November 20, 2009):
The PCI record provides a view of retrospective technology for an invention (cited patents and literature references) and its impact on subsequent technology (citing patents). Citations referenced by examiners or inventors in patent documents are called "cited" patents or literature references in the PCI record and correspond to the search reports that accompany patent publications. When a citation references older inventions/patents, it is also added to the family record as a "citing" patent.
Examiner citations are provided for family members added to the file from the following patent-issuing authorities: Belgium (BE), European Patent Office (EP), France (FR), Germany (DE), Japan (JP), Netherlands (NL), Spain (ES), United Kingdom (GB), United States (US), and WIPO/PCT (WO).
Inventor citations are also included for the time period, May 1994 - May 1997. For this same time period, examiner citations from Austria, Australia, Canada, Netherlands, New Zealand, South Africa, Sweden, and Switzerland are also included.