https://www.epo.org/en/node/how-can-i-search-country

How can I search for the country of the applicant or inventor?

In classic Espacenet it was possible to search for the applicant or inventor country with square brackets, e.g. pa = [de]. In new Espacenet this function is only possible via the filter function, where you can include or exclude individual applicant or inventor countries. The advantage of this approach is that you get a statistical evaluation of the applicant and inventor countries in the result set, without having to query each country individually.