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indexSearching the Derwent Primary Accession Number FieldSearches the Derwent Primary Accession Number field within a patent record. Enter one or more Primary Accession Numbers connected with the OR Boolean search operator. You can enter a complete Primary Accession Number or a partial Primary Accession Number using wildcards. indexAbout Derwent Primary Accession NumbersThe Primary Accession Number (PAN) is a unique identification number assigned by Derwent to each document. It consists of the following:
To search for a patent using the PAN, enter the four-digit year, a hyphen, and then the six-digit serial number. |
indexSearch Examples
indexSearch TipWhen using wildcards in a PAN search query, always truncate after the 9th number. For example: 1999-52791* returns several results. On the other hand: 1999-5279* returns no results. |