Derwent World Patents Index and DWPIM - more frequent updates from April 2019

DWPI and the Derwent Markush Resource, DWPIM, will move to twice-weekly updating from update 2019/23, available around 2nd April 2019. This means that in 2019, DWPI (files WPIX, WPIDS, WPINDEX) and DWPIM will increase from the previous 83 updates per year up to 99 updates, and from 2020 onwards there will be 104 updates per year. The change will allow more timely delivery of new and updated records, and will allow DWPI and DWPIM to keep pace with increasing global patent volumes.

Results from STN alerts set to run at every update will be delivered on the new twice-weekly schedule. However, alerts set to run weekly or monthly will not be affected by this change.