Every claim comprises:
1° A preamble mentioning the designation of the subject matter of the invention and the technical features which are necessary for the definition of the claimed elements but which, combined together, form part of the state of the art;
2° A characterising part, preceded by an expression of the type “characterised by”, setting out the technical features which, in conjunction with the features provided for in 1°, are those for which protection is sought.
However, a different procedure may be used if justified by the nature of the invention.