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System Data

File Name: CAplus (the file is available through the search system STN)

Company Name: Chemical Abstracts Service (CAS)

Length of Service: The Chemical Abstracts Service has been indexing chemistry-related publications since 1907; the Registry service was placed online (CAS ONLINE) in an early version in 1980.

Target User: Professional searcher in the chemical arts needing to perform a targeted search in chemical literature, possibly by structure searching via the CAS REGISTRY file and crossing results over into this specially indexed file.

Subscription type: Both flat fee subscriptions and pay-as-you-go pricing are available; however, the availability of flat fee subscriptions is limited to certain user groups.

Associated Data Analysis Tool: STN Anavist, STN Viewer



CAplus is a collection of records produced by the Chemical Abstracts Service (CAS). Like the Derwent World Patents Index, these records actually consist of re-written abstracts and special indexing content created by a staff of experts.

CAplus uses its own set of rules to organize patent documents into patent families. For more information on the patent families in CAplus, see the Patent Families glossary article.

Major Recent Updates

August 2013

CAS continues to expand its coverage with Brazilian, Romanian, Swiss and Malaysian patents. From the press release:

"Effective July 2013, CAS expanded its kind code coverage of chemistry and chemistry-relevant Brazilian, Swiss and Romanian patents. In addition, the backfile of Malaysian kind code A patents (granted patents and utility models) has been expanded to include 2009." Database news for July/August 2013

June 2013

In June 2013, CAS roles were "streamlined to increase clarity and search efficiency." CAS roles are indexing terms on CAPlus records that indicate the precise use of substances as disclosed in the patent or non-patent literature item which has been indexed. Database News for June 2013

June 2012

In June of 2012, CAplus was enhanced to contain Digital Object Identifiers (DOIs) for non-patent literature records, making the search for these articles for sale by their publishers on the web more straightforward. Database news for June 2012.

May 2012

In May 2012, the Eurasian Patent Organization became the 63rd patenting authority to be indexed in CAplus. Database News for May 2012

December 2011

In December of 2011, Malaysia became the 62nd authority to be indexed into CAplus, and examiner citations for Japanese patents were added into CAplus. Database News for December 2011

July 2010

In July 2010, CAS announced that it will begin indexing Costa Rican (CR) patent documents. In addition, this update will expand the kinds of Argentinian (AR) patent documents that are treated with CAS indexing.

Costa Rican coverage will include published applications and utility models.

Coverage of Argentinian documents will include the following kind codes:

  • A1 (patent applications)
  • A2 (divisional patent application)
  • A3 (additional patent application)
  • A4 (independent utility model application)
  • A6 (additional utility model application)

Read more at the "Database News for July 2010" update from CAS.

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