A supplementary European search report is required 

According to decisions taken by the Administrative Council, a supplementary European search report including a search opinion pursuant to Rule 62 is drawn up (and the search fees reduced in cases (i) to (iii)) in respect of an international application for which:

the Australian Patent Office, the State Intellectual Property Office of the People's Republic of China (SIPO), the Japan Patent Office, the Korean Intellectual Property Office, the Federal Service for Intellectual Property, Patents and Trademarks (Russian Federation) or the United States Patent and Trademark Office (USPTO) was the International Searching Authority (OJ EPO 2005, 548, OJ EPO 2012, 212; OJ EPO 2012, 219, and OJ EPO 2016, A20);
the Austrian Patent Office, the Finnish Patent and Registration Office, the Spanish Patent and Trademark Office, the Swedish Patent and Registration Office, the Visegrad Patent Institute, the Nordic Patent Institute or the Turkish Patent and Trademark Office was the International Searching Authority and where the international application was filed from 1 July 2005 up to and including 31 March 2020 (see OJ EPO 2005, 422, OJ EPO 2016, A20, and OJ EPO 2017, A57);
a supplementary international search report was drawn up by one of the European International Searching Authorities referred to in (ii) (OJ EPO 2010, 316, OJ EPO 2011, 616, and OJ EPO 2016, A20);
an international search report was drawn up by an International Searching Authority other than one of those mentioned in points (i) to (iii) and other than the EPO. 

For the applications mentioned under (i) to (iv), the supplementary European search is carried out in all the search documentation of the EPO. It is left to the search division's judgment whether a limitation as to the search documents is chosen. No precise limits can at present be set to these supplementary European searches since the documentation and search practices of these International Searching Authorities have not been fully harmonised in respect of the EPO.

As a general rule, the EPO should avoid any superfluous work and duplication of work and should rely on the efficiency and quality of the international searches to the largest extent possible. The EPO as designated Office requests the International Searching Authority or the Supplementary International Searching Authority to supply, together with the international search report, copies of the documents cited therein (Art. 20(3) PCT, see also Rule 44.3(a) PCT or Rule 45bis.7(c) PCT). When documents are cited that are not in one of the official languages of the EPO and the search division needs a translation into one of these languages, it should provide this itself (e.g. a patent family member in an official language of the EPO or, alternatively, an abstract of the document in an official language of the EPO, see B‑VI, 6.2), unless it is able to obtain it from any other source, e.g. the applicant or the International Searching Authority.

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