Looks like patentsview is missing the definitions for some of the CPC codes. For example, the code of B32B is missing a definition in the CPC group bulk data file, but a definition exists for this group in the official xml scheme. I count 30 missing groups out of the 656 groups.
I don't see anything obvious in the xml or in the parsing code (relevant snippet shown below) that would indicate where the problem is coming from. Sorry.
https://github.com/CSSIP-AIR/PatentsView-DB/blob/30ae3cbc3e7a02c46ef64fd8fd2c2ac9bfceb250/Scripts/Raw_Data_Parsers/uspto_parsers/cpc_class_tables.py#L32-L43
Looks like patentsview is missing the definitions for some of the CPC codes. For example, the code of B32B is missing a definition in the CPC group bulk data file, but a definition exists for this group in the official xml scheme. I count 30 missing groups out of the 656 groups.
I don't see anything obvious in the xml or in the parsing code (relevant snippet shown below) that would indicate where the problem is coming from. Sorry.
https://github.com/CSSIP-AIR/PatentsView-DB/blob/30ae3cbc3e7a02c46ef64fd8fd2c2ac9bfceb250/Scripts/Raw_Data_Parsers/uspto_parsers/cpc_class_tables.py#L32-L43