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January 2020

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DWPI Primary Accession Numbers from 2015

27. November 2014

With the increasing number of Basic patent applications published each year and the ongoing enhancements being made to DWPI coverage, there is a need to accommodate volumes of more than 2.5 million Basic patents per year from 2015.

Rather than increase the length of the primary accession number, Thomson Reuters will extend the use of letters in the accession number from DWPI Update 201501.

The format will be as follows:

YYYY-ANNNNA

Where YYYY = 4 digit year
A = 1 letter or digit
N = 1 digit

The first accession of 2015 will be 2015-000001. The number series will then increment up to 2015-000009, then to 2015-00000A and so on. Thomson Reuters will continue not to use the letters I or O as they can be confused with 1 or 0.