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Cooperative Patent Classification (CPC) Search and Display Capabilities Now Available in CASM/CAplusSM Family of Databases and USPAT Databases on STN®

January  17th,   2013

The new CPC classification system was launched on January 1, 2013. The European Patent Office (EPO) and the U.S. Patent and Trademark Office (USPTO) will jointly maintain the new patent classification system. The CPC replaces the European patent classifications, ECLA and ICO, and will eventually replace the U.S. National Patent Classification, USPC (also referred to as USNCL). Usage of the U.S. classification system will continue until 2015.

On January 12, 2013, STN added CPC search and display capabilities and a CPC thesaurus to the CA/CAplus family of databases and the USPATFULL/USPAT2 databases. CPC capabilities are already available in the INPADOCDB/INPAFAMDB databases on STN.

Plans for additional CPC implementation include the Derwent World Patents Index® (DWPISM), a number of full-text patent databases and USPATOLD.

ECLA, ICO and USPC searching capabilities remain available in relevant STN databases.

For more detailed information regarding implementation of CPC functionality, see the specific database banner message.

New CPC search fields include:


Search and select a CPC code


Search using CPC code metadata including:
- CPC codes applied for inventive aspects in a patent

- CPC codes initially assigned to the patent vs. during a reclassification

- Patent authority that assigned the CPC code

CPC code custom displays are available in STN databases offering CPC information. New display capabilities, in addition to the CPC display field, include:


CPC codes and the available metadata per CPC code


Deduplicated list of CPC codes for the patent family*


HIT display of the CPC code searched*




*CA/CAplus family of databases and USPAT databases only

CPC thesaurus structure is similar to the IPC and ECLA patent classification thesauri on STN. Monthly thesaurus updates will begin in 2Q2013.

Use of CPCs in SDIs. Please note that not all patents will have CPC classifications immediately available upon patent publication. CPC codes will be available soon after publication for:

  • All European patent (EP) and U.S. patent documents (USPTO)
  • PCT-publications with the EPO as searching authority
  • All patent documents classified by the national patent offices

For comprehensive SDIs, include the closest corresponding IPC code for each CPC code in a strategy.

More information is available by entering HELP CPC in the database of interest. Get more information on CPC Search and Display Fields

Training is scheduled for February 26, 2013 in an e-Seminar The Cooperative Patent Classification System on STN. Please register for this event here.

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