Patent and Priority Numbers

Derwent has developed its own formats for these fields. You are now able to search the numbers using either STN or Derwent format  

The formats for the individual numbers can be found in the appendix to the manual World Patents Index on STN. Here we have chosen the STN format. 

STN has installed some supersearch fields. By entering a code, searching is started simultaneously in several fields. They are also applicable in the database CA. 

During a query in field APPS the fields for Patent Application and Priority are simultaneously explored. A restriction to PATS includes the fields Patent Number and Cited Patents. By entering PCS searches the fields Patent Country and Designated States are initiated (Sect. 7.4.7). 

Derwent not only contains the basic patent, like Chemical Abstracts do, but in addition patent families from the countries covered by Derwent (Fig. 131). Chemical Abstracts Service also contains patent families with the limitation that they are only accessable in the printed version (Sect. 2.1.3.6) but not in the database. Other databases offering information concerning patent families are INPADOC and EDOC (Questel). 

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