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DWPI: Latest Manual Code Revision goes live

31. January 2014

The Derwent World Patents Index® (DWPISM) manual coding system annual revision for 2014 is now complete and is being used by the editorial teams to code records appearing in the database from DWPI Update 201401 onward. The editorial team consistently applies DWPI manual codes to new inventions across all 50 authorities covered in the database. Since the coding highlights the novel technical aspects of the invention as well as the application(s), it is extremely useful to improve the precision and recall of searches and the subsequent analysis of result sets.

As with previous revisions, the coding has been updated to:

  • Reflect changes in technology
  • Take into account suggestions for improvements
  • Enhance code descriptions and scope notes to improve the consistency of code application by the editorial teams and understanding of what each code covers.
  • 634 changes have been made to DWPI codes, including 190 New codes and updating of existing Titles, Scope notes and/or Search terms.
  • Notable changes include;
    • Major revision of S02-A and X13-F/G to remove duplication of codes covering common aspects within each of those existing sections
    • Expansion of X23 section.
    • Introduction of several new W04-M01 codes.
    • Introduction of several new Q51 codes in response to customer feedback
    • Editing of code titles in B, C and E classes to include full names of metals in addition to two-character abbreviations, to assist customers using the Manual Code lookup tool.
    • Introduction of codes B14-A02B0 and C14-A02B0 for Calcivirus / Norovirus in response to customer feedback.

The Coding Manuals and reference guides on the Thomson Reuters website have all been updated to include the changes. These resources are available at:

Additionally, users can provide suggestions for future manual code revisions by sending them to scientific.mcrdwpi(at)thomsonreuters(dot)com.