GL F IV 1 General

The application must contain "one or more claims".[Art. 78(1)(c); ]
These must:[Art. 84; ]
(i)"define the matter for which protection is sought"; 
(ii)"be clear and concise"; and 
(iii)"be supported by the description". 
Since the extent of the protection conferred by a European patent or application is determined by the claims (interpreted with the help of the description and the drawings), clarity of the claims is of the utmost importance (see also F‑IV, 4).[Art. 69(1); ]

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EPC Articles

EPO Guidelines - F The European Patent Application