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Before the EPO parameters are defined as features which are
based on directly measurable properties or combinations of several
variables in the form of formulae. This might be a claim defined by
the viscosity of a composition, or the particle size of a powder,
for example. Relying on such features to define an invention is
commonplace within the chemical sphere and can be very useful.
However, their utility is not limited to such subject matter and
they could be used to define characteristic features in a broad