Contents

Database Description

Derwent World Patents Index^® (DWPI^SM), produced by Thomson Scientific, provides access to information from more than 30 million patent documents, giving details of over 14.8 million inventions. Each update, approximately 20,000 documents from 41 patent-issuing authorities are added to DWPI. The patent-issuing authorities are listed in the Sources section on page 2.

Each record in the database describes a single "patent family" containing data from the first publication of an invention, known as the "basic patent", as well as any further published patents relating to that invention, known as "equivalents". The records contain bibliographic data, Thomson Scientific-assigned titles, abstracts, general indexing and in-depth chemical and polymer indexing. Additionally, electrical and engineering drawings are present in records dating back to 1988, and chemical structure drawings are present in records dating back to 1992.

Starting in 1999, additional abstracts and indexing features are provided. The alerting abstract (formerly "basic abstract") is organized into paragraphs with informative, searchable paragraph headings. The alerting abstract also contains a Novelty paragraph describing the non-obvious improvements over previous technology. A Technology Focus abstract contains separate paragraphs providing different technological viewpoints of the invention. The Extension Abstract and Documentation Abstract can only be found in File 350 and provide detailed summaries that bridge the gap between the concise abstract summary and the full text patent document.

The records in DWPI have been further enhanced with original publication data such as full author name and address, document title, abstract, claims, legal representative. The amount of this original publication data present in each record varies by publishing authority, patent kind, and time, as shown in the Sources section.

File 351 and File 352 are identical in coverage but are split by geographical access. File 351 is available to users worldwide except in Japan. File 352 is available to Japanese users only. File 350, Derwent World Patents Index Extension (DWPIX) provides additional search capabilities for Thomson Scientific Subscribers.

Please see also the Bluesheets for File 331, Derwent World Patents Index First View^SM, which provides fast alerting access to new patent documents, before the complete DWPI record is released; File 355, Chemistry Resource (DCR), which provides graphical chemical structure searching with a link back to the DWPI records that include the structures; and File 342, Patents Citation Index (PCI), which details examiner and author patent citations for patents from the 6 largest patent-issuing authorities.

Subject Coverage

DWPI covers pharmaceutical patents from 1963, agricultural patents from 1965, polymer & plastics patents from 1966, all chemical patents from 1970, and all patentable technology from 1974. Beginning 2006 selected original publication data by authority is included. The table in the Sources section provides a list of the authorities covered in the database and the original publication data included for that authority.

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