Non-Patent Literature reference numbers (XP)

NPL reference numbers are numbers assigned to non-patent literature (XP) documents.

In Espacenet, only XP documents which have been classified and/or cited in the search report produced at the EPO are available.

The XP number format is: XP followed by a serial number (variable, maximum nine digits).

Examples: XP1, XP000123456.

It is not possible either to retrieve an XP document with the name of the author or to limit a search to XP documents only.

XP documents can be retrieved by entering the corresponding number in the Smart search mask.

For more information on Espacenet, see the following pages: