I am currently looking at a document and I am not too clear about the specific operations in the document. The contents of the document are as follows：
We search for the reassigned U.S patents to the identified 10 PAEs and three DPAs from the USPTO patent reassignment database (http://assignement.uspto.gov). We limit the sample to the patents that were
published from 1995 to 2009 and transacted from 2008 to 2014. We collect the detailed information of patents from Worldwide Patent Statistical Database (PATSTAT) 2013 published by European Patent
The list of companies with 10 DPAs and 3 PAEs has been given in the article.
Please help me，thanks you so much！
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