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New on STN

January 2020

Changes to Derwent WPI Update numbering and the total number of annual DWPI updates

December 2019

Derwent World Patents Index: Manual Code revision 2020

December 2019

New Korean Patent Full-Text Database KRFULL released

STN User Meetings

Munich, 20.05.2020

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Higher System Limits Increase the Power of STN Substance-Based Searching

14. December 2010

Substance searchers on STN now have vastly enhanced searching power due to a recent increase in search limits in the CAS databases. The increased limits provide greater flexibility and efficiency in the substance-search processes.

The iteration and answer limits for CAS REGISTRY structure searching are increasing from

  • 2 million to 6 million for online searches
  • 3 million to 8 million for batch searches

The current accession number crossover limit from MARPAT to and from the CA/CAplus databases is doubling from 50,000 to 100,000.

The increase in system limits will permit broader REGISTRY structure searches to run to completion, increasing search power and efficiency. Enhanced crossover limits allow increased flexibility as searchers move between key STN data sources.

For additional information, visit http://www.stn-international.de/sum_sheets.html page.