I'm working with a file which is a crosswalk between author IDs and inventor ids, from 2009 - the file is called "authorlink_uspto.tsv" which can be found here: https://databank.illinois.edu/datasets/IDB-4370459
The format of the inventor_id there is like this: e.g. 1922874
I tried using "persistent_inventor_disambig.tsv" file with the crosswalk between different disambiguations of inventors, but it looks like the earliest version of the inventor_id is 2017, which is in a slightly different format: e.g. 4341225-2
Is there a version of inventor_ids back in 2009? Do you know how I can find inventor_ids back in 2009?
Thank you very much in advance, with much appreciation