Help!--Global patent index (GPI) query problem!
Posted: Fri Jun 20, 2014 5:06 pm
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!
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!