EPO - Discussion forums

Just a simple question: I'm looking for now many patents contains NPL in a certain patent group.

Specifically,
There is a group of patents:
time span: 2004/01/01 to present
sector: IPC=A61P

There are many patents in this group, and some cited NPL (non-patent-literature) but others don't. What's the query for the number of patents containing NPL in this group?

using query "PUD>=2004/01/01 and IPC=A61P" I can get the total number of patents. The number of searching result is offered. So of which, how many patent contains NPL?

I tried "PUD>=2004/01/01 and IPC=A61P and not (CNPL=*)" but it doesn't work. I guess "not (CNPL=*)" stands for missing information of NPL in a patent but not "this patent doesn't contain NPL".

Please somebody help me!

First of all, we apologise for answering so late to your post which we overlooked. For future questions about GPI, please use the GPI forum http://forums.epo.org/global-patent-index-gpi/

PUD>=2004/01/01 and IPC=A61P and CNPL=*
retrieves all publications containing at least 1 NPL citation whatever the origin of the citation (from the applicant, search report, third parties, etc. - see also more detailed search criteria such as CNSR "NPL citations in search reports", etc.)

NPL citations can be included in you result list for further download (current download limit = 1.500)

A query using "ANDNOT" or "AND NOT" may help to assess the quality of bibliographic data, e.g.
PUC=AT AND PUD=2014 ANDNOT IPC=* would retrieve publications lacking IPC data.