Patent-Pilot utilizes the full list of patent appications that were filed at the World Intellectual Property Office (WIPO) under the Patent Cooperation Treaty (PCT). These are more than 2 million patent applications.

The attorneys and law firms have been harmonized and aggregated to a law firm or company. Only lawyers, who have represented at least 5 PCT applications since 1978, have been included in the list. Patent lawyers who are employed by a company rather than a law firm, were removed. This results in more than 5,000 law firms and more than 18,000 associated patent attorneys in 67 countries on all continents.