6.5 Definition in terms of function 

Even where only one example of the feature has been given in the description, a claim may broadly define a feature in terms of its function, i.e. as a functional feature, if it is clear to the skilled person that other means could be used for the same function (see also F‑IV, 2.1 and F-IV, 4.10). For example, "terminal position detecting means" in a claim might be supported by a single example comprising a limit switch, it being evident to the skilled person that e.g. a photoelectric cell or a strain gauge could be used instead. In general, however, if the entire contents of the application are such as to convey the impression that a function is to be carried out in a particular way, with no intimation that alternative means are envisaged, and a claim is formulated in such a way as to embrace other or all means of performing the function, then an objection should be raised. Furthermore, it may not be sufficient for the description to merely state in vague terms that other means may be adopted if it is not reasonably clear what they might be or how they might be used.