The Derwent World Patents Index (files WPINDEX/ WPIDS/WPIX) is a comprehensive value-added database of worldwide patents covering all areas of technology. The intellectual value of DWPI is the result of a thorough editorial process of classification, abstracting, and indexing. Original titles and abstracts are rewritten to reveal the actual invention and highlight the main uses and advantages of the technology.

Content and coverage
Patent records in DWPI are compiled from the patents and published applications of 41 global issuing authorities. The file contains about 16 million documents back to 1963 and is updated every 3-4 days.

• high-quality bibliographic information which summarizes all publication details for a particular invention
• enhanced Derwent titles and patent-focused abstracts
• DWPI-specific coding and deep indexing for chemical patents
• full coverage of the International Patent Classification (IPC 8)
• original patent titles, abstracts, and main claim text

The Derwent Value-Add for Chemical Patents
DWPI Chemistry Resource (DCR) provides structure based access to specific chemical compounds back to 1999 for all users of DWPI. Subscribers can also benefit from

• Fragmentation coding providing access to specific and Markush structures back to 1963
• Polymer Indexing available for all polymerrelated patents back to 1966
• Manual Codes used in the chemical, pharmaceutical and agrochemical area to classify significant parts of the invention and its commercial application, back to 1963.

The Derwent Value-Add for Engineering Patents
Manual Codes are used for engineering patents to classify the novel technical aspects of an invention as well as its commercial application, back to 1980

Your Benefit

• more comprehensive retrieval and easier relevance checking from value-added text data
• more reliable technology searching with DWPI deep indexing
• great variety of search options for more focused searches
• efficient patent analysis from highly standardized bibliographic data

A sample record explained
Derwent World Patents Index User Guide
User Documentation on the Derwent World Patents
Details of the patents covered in current updates
Explore Derwent World Patents Index in STN AnaVist
IPC Reform

Articles coming soon in STNews:

• Derwent WPI Country Coverage Enhancement - Taiwan (23 February, 2009)
• Derwent WPI has been enhanced with Japanese Patent Classification Data (22 December, 2008)
• Derwent World Patents Index with more value-add information and machine-translated claims for China and Korea (30 September, 2008)
• Derwent World Patents Index extends coverage of China and Japan (8 July, 2008)