For PCT applications, as a rule, an international search is carried out for all international applications. There are instances, however, where the International Searching Authority (ISA) will not be able to carry out a search. For example, where the international application relates to subject matter which the ISA is not required to search or if the description, claims or drawings are not sufficiently clear for it to carry out a meaningful search. In such cases, the ISA will issue a declaration that no international search report will be issued.
