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Using the citing and cited accession number count and patent number count fields in DPCI

About DPCI

The Patents Citation Index, DPCI, is a unique database of examiner citations, both to patents and journal literature, appearing in patents from six major patenting authorities.

DPCI makes citation searching convenient and cost-effective. DPCI enhances prior art searching, competitive analysis, litigation, and the challenging of examiners' decisions and provides easy crossover to patent drawings and abstracts found in the Derwent World Patents Index (files WPINDEX/WPIDS/WPIX).

Cited and Citing Accession Number and Patent Number Count fields

Two fields, Citing Accession Number Count (OSC.G) and Cited Accession Number Count (OSC.D), offer a tool to supplement the corresponding Citing Patent Number Count (PNC.G) and Cited Patent Number Count fields (PNC.D).

These fields allow you to search and analyze the numerical count of cited or citing Derwent WPI records (patent families), as opposed to individual citing or cited patents. OSC.G will often be lower than the corresponding PNC.G, because OSC.G counts only common citations from equivalent patents in the same Derwent WPI patent family once. Analysis of OSC.G offers a new, more meaningful, dimension to identifying the most highly cited patents in a search answer set.

Search example

To use these new tools, follow this general strategy.