STNews - November/December 2010


ReaxysFile available on STN   

The chemical database ReaxysFile includes substances and reactions with the data and references shown together in one record. For details about minor changes of field qualifiers please enter HELP CHANGE at an arrow prompt when in the ReaxysFile. For information on the content enter HELP CONTENT.

Selected STN databases removed on December 31, 2010

The following databases will be removed from STN on December 31, 2010:




















These changes are necessary due to a variety of technical, fiscal, and producer-driven factors. STN will redirect resources to highly requested enhancements for key databases and development of the new STN platform announced earlier this year, which will provide a substantially enhanced customer experience in the future.

If you need assistance in locating alternative sources for content currently accessed through these databases, please contact CAS Customer Center or your local STN representative.

Higher system limits increase the power of STN substance-based searching

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


REGISTRY iteration and answer limits




Online searches

2 million

6 million

Batch searches

3 million

8 million


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


MARPAT crossover limits






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.

Search an additional 46,850 records with MEDLINE backfile extension to 1946


Now you can search an additional 46,850 bibliographic records recently added to the MEDLINE backfile, extending its coverage to 1946.

NOTE: None of these backfile records supplied by the National Library of Medicine (entry date /ED of 20101000) included abstracts. You may encounter a small number of existing publication-year 1946 MEDLINE records that do contain abstracts, but those records were not part of this enhancement.

New PNK field allows more precise crossover among STN patent databases

To provide more precise patent publication number crossovers, STN has introduced the PNK (Patent Number/Kind Code) field for use when transferring patent publication numbers between databases. PNK field crossovers can be used to transfer publication numbers of published applications and granted patents. A new PNK.B (Patent Number/Kind Code of the Basic Patent) field also has been implemented in CASM/CAplusSM and is expected to be implemented soon in the Derwent World Patents Index (DWPISM) and in the INPAFAMDB/INPADOCDB family of databases.

PNK has also been added to these databases:




PNK is available for SEARCH, DISPLAY, SELECT, and ANALYZE. (In the DWPI and INPADOCDB/INPAFAMDB databases, however, PNK displays will be the same as PN displays.)

The PNK field is necessary because some patent-granting authorities use the same numbering schemes for both patent applications and granted patents, or for both patents and utility models. This causes searching difficulties for customers crossing over patent publication numbers, particularly when Japanese, Chinese, and Taiwanese patents were involved.

When you need to transfer patent publication numbers from one database to another, the PNK field will enable you to transfer them precisely. Just use TRANSFER PNK rather than TRANSFER PN to achieve better quality results.  




When you transfer Chinese granted patent number CN 1222622 on biotechnology from HCAplus to DWPI without its kind code C, you will retrieve a Chinese application with the same number, but with a totally irrelevant subject--door locks.





But when you transfer using the new PNK field that includes the kind code, you will maintain precision in your retrievals.

Value-added indexing improves access to World Traditional Medicine Patents in CAplus


Now you can locate answers to your research questions more quickly and easily when you search the archive of 50,000 unique World Traditional Medicine (WTM) patents offered by CAplus. Newly added index terms, including CAS Registry Numbers and roles, provide many additional points of access that you can use to rapidly zero in on the information you need.

The CAplus WTM patent collection is a body of novel scientific literature especially intriguing to pharmaceutical and consumer products industries worldwide. (See article entitled 50,000 World Traditional Medicine (WTM) patents now available in CAplus published in the March-April 2010 Archive of STN Database News at /support/stngen/stnews/dbnews/marapr10.html#world.)

Previously, the only indexing available for these WTM patents consisted of keyword terms in the ST (Supplementary Terms) field. The ST field typically contains the Latin names of plants and animals used in creating the preparations and remedies documented in these patents.

The recent addition of this enhanced indexing gives you many more avenues to follow when exploring the unusual content of the WTM patent collection.

To identify WTM patents enhanced with value-added indexing, look for the terms nosection" and/or "nonindexed" in the custom display field File Segment (FS).     

An example of a WTM patent with enhanced indexing is provided below:


  • index terms (IT field)
  • 57-88-5 (the CAS Registry Number for cholesterol)
  • RL: BSU (Biological study, unclassified) role

STN News - What's New on STN

    March/April 2017 | Latest Release of New STN
    Enhances Search History and Expands Database

    January/February 2017 | 2017 Version of MEDLINE
    is Now Available    
    November/December 2016 | PatentPak Content is 
    Rapidly Expanding!

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