Hi pbhjpbhj, thanks for the feedback. I think at the moment company name disambiguation, especially with patents is an unsolved problem. There are easier tasks such as cleaning typos and company name changes, but then as you mentioned - mergers, splits etc. Which companies with exactly the same name but in different countries are the same? And in most cases ownership changes of the patents are not even tracked. Thats why we decided to do some preprocessing, but did not try to solve this problem by now.