GL H IV 4.2 In examination proceedings

The question of allowability of amendments is legally a question of whether the application as so amended is allowable. An amended application must of course satisfy all the requirements of the EPC including, in particular, inventive step and the other matters listed in B‑XI, 3.6 (see also C‑III, 2). Also, however, especially when the claims have been substantially limited, the examining division should bear in mind that the following questions may require special consideration at the amendment stage.
(i)Unity of invention 
Do the amended claims still satisfy the requirements of Art. 82? If the search report seems to reveal lack of novelty or inventive step in the concept common to all the claims, but the amended claims do not necessitate further search, the examining division should consider carefully whether an objection of lack of unity is justified at this stage of the proceedings (see F‑V, 8). If, however, the claims lack a common inventive concept and a further search is necessary, objection should be raised.
(ii)Agreement of description and claims 
If the claims have been amended, will the description require corresponding amendment to remove serious inconsistency between them? For example, is every embodiment of the invention described still within the scope of one or more claims? (see F‑IV, 4.3). Conversely, are all of the amended claims supported by the description? (see F‑IV, 6). Also, if the categories of claims have been altered, will the title require corresponding amendment (see H‑V, 8)?

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EPC Articles

EPO Guidelines - B Search

EPO Guidelines - C Procedureal Aspects of Substantive Examination

EPO Guidelines - F The European Patent Application

EPO Guidelines - H Amendments and Corrections

EPO PCT GL - H Amendments and Corrections