In reaction to such a request from the International Searching Authority (ISA), the applicant may pay all or some of the requested additional search fees, and the International Searching Authority (ISA) then establishes the international search for all or some of the inventions or groups of inventions, respectively. The applicant may also decide not to pay any of the additional search fees, and, in such case, the ISA does not carry out a search for the inventions or groups of inventions for which no search fees have been paid. The international search report (ISR) is then established only for the first claimed invention.