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Guide for applicants, Part 2: PCT procedure before the EPO (Euro-PCT Guide)

 
 
Cascading non-unity
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If in response to an invitation by the EPO as ISA additional search fees are paid and the additional search(es) performed reveal(s) a further lack of unity ("a posteriori"), no further invitation to pay additional search fees is issued and the international search is limited to the first invention of each further invention for which an additional fee was paid. If a cascading lack of unity of invention is likely to arise, the invitation to pay additional search fees will contain a warning.