GL F V 3.2.4 Common dependent claims

While an independent claim is always part of the common matter among its dependent claims, the opposite is not true: a claim dependent on several independent claims is never part of the common matter between these independent claims.
For example, an application contains three independent claims, A, B and C, and several claims combining the content of the independent claims, i.e.

GL F V 3.2.3 Dependent claims

A dependent claim and the higher-ranking claim on which it depends cannot be grouped into two different groups of inventions (see F‑V, 2.1).
If, however, the higher-ranking claim appears not to be patentable, then the question of whether there is still an inventive link between all the claims dependent on that higher-ranking claim needs to be carefully considered.
In

GL F V 3.2 Grouping of inventions

As a general rule, after the initial identification of subject-matter lacking unity, the claims and alternatives contained in claims are assigned to the identified groups of inventions. This step comprises the assessment of which of the remaining claims or alternatives in claims could potentially relate to the same technical problem. By doing so, groups of inventions are identified wherein each group of inventions relates to unitary subject-matter in view of the prior art at hand.

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