I´m new in research in patent classificacions and need to get the CCL: Current US Classification, CPC: Current CPC Classification, CPCL:Current CPC Classification Class and ICL: International Classification. of various patent numbers i used to get them from see the forest, but found out that they had a lot of errors, furthermore I can´t find the bulk database for that information, the anwers that i looked up in this page are good but the links no longer work. Can anyone give me a way to solve this problem ?
The Lens provides classification codes as fields. You can download the results of a search to various formats including CSV and JSON files. I just tested it and got the following column headers related to classifications:
CPC Classifications,IPCR Classifications,US Classifications
There is also an API for bulk queries although that, I believe is not free.