provided by
provided by FIZ Karlsruhe

New on STN

November 2019

PatentPak(R) now available in USPATFULL/USPAT2 on STNext(R)

November 2019

CAS FORMULATIONS (TM) Enhanced on STNext

November 2019

German Patent Full-Text Database DEFULL enhanced

This website uses cookies. Matomo is used for the usage analysis. By continuing to use the website, you agree to this. If you object to the usage analysis or would like to learn more about cookies, please click on the privacy policy. Close

New Indicator Identifies Multiple Basic Patent Records Containing Equivalent Chemical Indexing in CA/CAplus

22. December 2009

Effective December 20, you can identify the multiple basic records in the CA and CAplus databases that have equivalent chemical indexing.

These duplicate records occur as a result of CAS’ efforts to provide maximum coverage of substance information disclosed in patents. On July 1, 2008, CAS began adding as basic patents both Patent Cooperation Treaty (PCT) applications and their original national equivalents (those with the oldest priority from the U.S., Germany, United Kingdom,France, Canada, and/or the EPO). This policy was  further expanded to include applications from Japan and Russia on January 1, 2009.

An estimated 13,000 patent records added to the CA/CAplus family of databases since 2008 have equivalent chemical indexing because there is no difference in CAS Registry Numbers indexed in the PCT application(s) and their original national application(s).  
 
To enable you to identify records that contain equivalent chemical indexing, an indicator has been added to the Source (SO) field. The indicator consists of a phrase of searchable text containing the following words: Chemical Indexing Equivalent to, up to two related document number(s), and  the patent country code for the patent with the equivalent chemical indexing.

A sample record appears below. Note the additional information in the SO field.

L1 ANSWER 1 OF 1  CAPLUS  COPYRIGHT 2009 ACS on STN
AN 2009:1252786  CAPLUS
DN 151:451634
TI Process for cleaning articles
PA Dow Global Technologies Inc., USA
SO Eur.Pat.Appl.,10pp.;Chemical Indexing Equivalent to 151:451638 (WO)
   CODEN: EPXXDW
DT Patent
LA English
FAN.CNT 2
      PATENT NO.       KIND   DATE        APPLICATION NO.   DATE
PI    EP 2108464       A1     20091014    EP 2008-103465    20080409
      WO 2009126369    A1     20091015    WO 2009-US34346   20090218
PRAI EP 2008-103465      A      20080409     
RE.CNT  3     THERE ARE 3 CITED REFERENCES AVAILABLE FOR THIS RECORD
              ALL CITATIONS AVAILABLE IN THE RE FORMAT

CAS is working to develop more robust solutions for identifying records that contain equivalent chemical indexing. Until then, the following interim strategies can be used:

To retain PCT applications (and remove national basics) in an L-number answer set, use the following strategy:

    S L# not (chemical indexing equivalent/so not wo/pc.b)

To remove PCT applications (and retain national basics) from an L-number answer set, use the following strategy:

    S L# not (chemical indexing equivalent/so and wo/pc.b)

You can also use the FSORT command to reduce each patent family in your answerset to a single representative, but keep in mind that FSORT may also remove Continuations-In-Part (CIPs) and Divisionals.