DWPI Coverage Tables
The content in DWPITM is updated regularly and records are kept of all updates made. In the DWPI coverage table below the latest publication date is provided for each kind of patent included in that update. This does not necessarily include all documents for that publication date: some may have been included in earlier updates, and some may appear in future updates. The number of patent records for each publication kind is the total of new, edited, amended and corrected records included in the update.
DWPI Update Dates
Dates of data loaded into STN from 1994 to present
DWPI Deleted Records
Records can be deleted from DWPI if the patent is withdrawn by the patent office, or if it has been moved into another DWPI family. A list of deleted records is available through the link below.
Other update news
2015 Revision To DWPI Non-Structural Fragmentation Codes
Chinese dual filings are now linked within DWPI families