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Derwent Citation Country Coverage

Derwent Innovations Index provides ongoing coverage of patent and literature citations referenced by the Patent Office Examiners for source patents from the following patenting authorities:

  • European (EP)
  • Patent Cooperation Treaty ("World", WO)
  • US (US)
  • Germany (DE)
  • British (GB)
  • Japanese (JP)

Details of coverage to date and ongoing are summarized below. Inventor citations are covered ongoing for a limited number of EP and WO patents.

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Did You Know ...

The scope of citation coverage varies over time. This is due to differences in source data used for the backfile loads and ongoing coverage. In addition, the production system was re-engineered in 1997 for electronic data capture of Examiner citations from the six major patenting authorities (US, EP, WO, DE, GB, JP) only.

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Country

1994-1996

1997 to date

Additional coverage

Notes

Germany

Examiner and inventor patent and literature citations (including some utility models)

Examiner patent and literature citations (including utility models)

Weekly coverage

European

Examiner and inventor patent and literature citations

Examiner patent and literature citations.
Inventor patent and literature citations are available for approximately 10% of applications.

Source data for EP citations is loaded every 4-6 weeks.

Note that this does not specify the patent publication stage of the citing EP patent and so all are recorded as kind "A".

EP-A Examiner patent citations also included back to 1978

Weekly updates for EP-B2 examiner citations have also been added since mid-1997. As a result, there may be some duplication with citations recorded for the bulk data loaded every 4-6 weeks.

British

GB-A Examiner and inventor patent and literature citations

GB-A Examiner patent and literature citations

Weekly coverage

GB-B Examiner patent and literature citations also included from the beginning of 1997

Japanese

JP-B2 Examiner patent citations

Transliteration of literature citations was only provided during 1994.

JP-B2 Examiner patent citations

Weekly coverage

Limited to chemical patents covered in Derwent World Patents Index®

US

Examiner and inventor patent and literature citations

Examiner patent and literature citations

Weekly coverage

Examiner citations also included back to 1974

WO (PCT)

Examiner and inventor patent and literature citations

Examiner patent and literature citations.
No transliteration of literature citations for Russian, Chinese and Japanese literature citations

Source data for WO citations is loaded every 4-6 weeks.

Note that this does not specify the patent publication stage of the citing WO patent and so all are recorded as kind "A".

Examiner patent citations also included back to 1978

Australia,
Austria,
Belgium,
Canada,
France,
Netherlands,
New Zealand,
South Africa,
Sweden,
Switzerland

Examiner and inventor patent and literature citations