2.3. Conciseness and number of claims

Whilst R. 43(2) EPC provides for a restriction in the number of independent claims per category, there is no equivalent limit on the number of dependent claims or claims concerning a particular embodiment of an invention (R. 43(3) and (4) EPC). R. 43(5) EPC provides that the number of claims shall be reasonable with regard to the nature of the invention claimed.

Pursuant to Art. 84 EPC claims must not only be clear, but also concise. In a number of cases this has been interpreted as requiring claims to be concise both individually and in their entirety (see e.g. T 79/91, T 246/91). The examination of these requirements depends on the specific facts of the case (see also T 596/97, T 993/07).

A Markush formula is the most concise means of defining a class of chemical compounds in a claim (T 1020/98). The examining division had held that "formulating claims in a style that makes routine tasks in substantive examination unnecessarily difficult" was a contravention of Art. 84 EPC 1973. However, there is no legal basis in the Convention for a request to restrict the content of an independent claim so that substantive examination can be carried out with greater ease and less effort.

Regarding lack of conciseness because of a superfluous claim, see e.g. T 988/02.

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