I'm using Global patent index (GPI) and stuck on a "query". How to find number of patents containing NPL (non-patent-literature) in a sector?
Specifically, sector: A61P. Time: 2004/01/01 to present. In this patent group, some patents cited other patents while others cited NPL. So what the query should be to figure out how many of these patents contain NPL?
I tried the query: "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"
Thank you very much! Somebody help me!
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