Patents Citation Index (PCI) provides patent citation information from 17 sources including the European Patent Office and the World Intellectual Property Organisation. Coverage has changed over time as detailed below. Applications for PCI include novelty searching, gathering documentation to support patent applications, and monitoring for patent infringements by yourself or a competitor.

	Examiner Citations	Inventor Citations
Belgium (BE)	May 1994 - May 1997; March 2007 to date*	May 1994 - May 1997
Germany (DE)	May 1994 to date	May 1994 - May 1997
European (EP)	1978 to date	May 1994 - May 1997
France (FR)	May 1994 - May 1997; March 2007 to date*	May 1994 - May 1997
Japan (JP)	May 1994 to date	May 1994 - May 1997
Netherlands (NL)	May 1994 - May 1997; March 2007 to date*	May 1994 - May 1997
PCT (WO)	1978 to date	May 1994 - May 1997
Spain (ES)	March 2007 to date*	-----
United Kingdom (GB)	May 1994 to date	May 1994 - May 1997
United States (US)	1973 to date	May 1994 - May 1997

* March 17th was the date of the first DocDB issue processed from where these records were sourced

The following countries are covered for inventor and examiner citations from May 1994 - May 1997 only:

Austria (AT)		New Zealand (NZ)
Canada (CA)		Australia (AU)
Switzerland (CH)		South Africa (ZA)
Sweden (SE)

Each record in PCI contains the following:

Titles and patent family information from Derwent World Patents Index (DWPI)

Cited patent and journal references

Citing patent references