Yes, I was using ESPACENET and got limited results. Though I like to have bibliographic data similar to ESPACENET result without limitation. What I like to do is to co-classification study for CPC class of Y02B 20/72. Following is my query to search PATSTAT database: SELECT DISTINCT t1.appln_id, t1....

Hi there, I try to extract all the patent in CPC subclass of Y02B 20/72 and download the bibliographic data. I have no problem getting the result though one thing I could not figure out is that how to get all the CPC associated with the patent. In my result table, I have the CPC code that I searched...