I'm looking for now many patents contains NPL in a certain patent group.
Specifically, using query "PUD>=2004/01/01 and IPC=A61P" I can get the total number of patents in sector "A61P" from 2004/01/01 to present. My question is how many of them 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 but not "don't contain NPL"
This is the basis of my research and very important to me.
Thank you very much!
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