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New on STN

February 2020

New legal event data from Croatia, Italy, and Poland in INPADOCDB and INPAFAMDB

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

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CAS Registry Number Crossover Limits Increased to 500,000 in Key STN Databases

06. April 2010

Increase your STN search power by taking advantage of the expanded
crossover limits for CAS Registry Numbers. Now you can crossover up
to 500,000 CAS Registry Numbers at one time from CAS REGISTRY to six
key STN databases instead of the previous limit of 300,000. The new
limit applies to the following databases:


  • CA/ CAplus
  • USPAT2

There is a charge to crossover each CAS Registry Number into non-CAS
databases. Enter HELP COST in the CAS REGISTRY or ZREGISTRY
databases for details.

For additional information about these databases, refer to the page.