GL F V 3.4 Determination of the invention first mentioned in the claims

When lack of unity is established, the sequence of the claimed (groups of) inventions will normally start with the invention first mentioned in the claims ("first invention"); see also B‑VII, 1.1 and 2.3. In other words, as a general rule the division of subject-matter follows the order of appearance of the different inventions in the claims. The content of the dependent claims will be taken into account when determining the first invention. Trivial claims relating exclusively to features that seem unimportant in the light of the invention or that are generally known in the technical field of the invention are disregarded (see B‑III, 3.8 for the search phase).[Rule 64(1); Rule 164(1); ]
However, if the filed claims do not fulfil the requirements of Rule 43(4), i.e. if the dependency of the claims is not correct, the claims will be re-ordered accordingly before assessing the fulfilment of the requirements of unity.

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EPC Implementing Rules

EPO Guidelines - B Search

EPO Guidelines - F The European Patent Application

EPO PCT GL - F (not assigned)