GL G IV 7.3.3 Matters to be determined by the division in cases of oral description

Once again, in such cases the following details will have to be determined:
(i)when the oral description took place; 
(ii)what was described orally; and 
(iii)whether the oral description was made available to the public; this will also depend on the type of oral description (conversation, lecture) and on the place at which the description was given (public meeting, factory hall; see also G‑IV, 7.2(iii)).

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EPO Guidelines - G Patentability