London, UK (29 November 2005)

Thomson Scientific and Dialog today announced at Online Information 2005 that the enhanced version of Derwent World Patents Index® (DWPI^SM) will be available on the Dialog online service in quarter one, 2006.

DWPI is a comprehensive database of value-added patent information and is provided by Thomson Scientific. The enhanced DWPI database (Files 350, 351 and 352 on Dialog) will extend the content and functionality of the database and improve the ability of a searcher to find the patent records they need.

"The more robust features and content available in the new DWPI file allows our customers to extract greater value from DWPI," said David Brown, Dialog general manager. "Those familiar with DWPI will continue to find everything they expect from DWPI, plus new information that will allow for greater analysis of the returned patent data."

The file is being re-designed to accommodate the requirements of the International Patent Classification (IPC), Version 8, which enters into force January 1, 2006. As a result of the changes to the IPC classification, all DWPI records affected by the patent office reclassification will be updated on an ongoing basis and IPC fields will be added in the online file, allowing users to easily distinguish between original and re-classified IPC data.

Also, available for the first time will be 750,000 documentation abstracts in a text-searchable format. The enhanced file also will include new family member sub-sections, which include first-level data such as the original patent titles and abstracts, extra bibliographic data such as full names of inventors and associated addresses, patent assignee addresses and patent agent information.

"We are pleased to be working with our Dialog colleagues in making the enhanced version of DWPI available to our shared customers," said Brian Tyler, executive vice president of corporate markets. "Our enhancements will help searchers gain the maximum benefit from the IPC8 reform, and conduct even more effective searches of the extensive patent information in Derwent World Patents Index."

A test file of the enhanced DWPI is being presented at the Online Information 2005 conference from November 29 to December 1, 2005. Conference attendees are invited to the Thomson Scientific and Dialog stand (Stand no. 248) for a sneak preview of the enhanced database.

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About The Thomson Corporation
The Thomson Corporation (www.thomson.com), with 2004 revenues of $8.10 billion, is a global leader in providing integrated information solutions to business and professional customers. Thomson provides value-added information, software tools and applications to more than 20 million users in the fields of law, tax, accounting, financial services, higher education, reference information, corporate e-learning and assessment, scientific research and healthcare. With operational headquarters in Stamford, Conn., Thomson has approximately 38,000 employees and provides services in approximately 130 countries. The Corporation's common shares are listed on the New York and Toronto stock exchanges (NYSE: TOC; TSX: TOC).

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