directory: /uspto_assignees_xml_parser
file: USPTO_Assignee_Download.pl
The XML files are available at https://bulkdata.uspto.gov/data2/patent/assignment/
The down-loader script used to download XML files is essentially same, with minor changes, as the one used for downloading USPTO patent-data.
That is, the current version of down-loader script downloads all files from the base URL (see above): https://bulkdata.uspto.gov/data2/patent/assignment/
=== Parsing the XML files ===