In T 243/91
it was stated that a functional feature was allowable if that feature provided a clear instruction to a skilled person to reduce it to practice without undue burden. In T 893/90
the feature "being present in amounts and proportions just sufficient to arrest bleeding" was held to be a functional feature which defined a technical result which also constituted a testable criterion to be satisfied by the claimed pharmaceutical composition. Because such testing involved only routine trials, the adopted functional language was allowable. The introduction of a reference to specific amounts and/or proportions of the components would limit the claim and was not necessary. The situation in T 893/90
was distinguished from the one before the board in T 181/96
. Although in the former case the testing might appear prima facie bothersome, it was nothing out of the ordinary for the field of medicine, involving only routine trials. In the case in suit, however, which concerned an apparatus for hydrostatically testing a sealing element of a threaded connection between two connected sections of pipe, there was no general type of pipe connections with generally well-defined ranges of dimensions which were thus generally available for verification of the functional features as such.