The following shall not be registered or if registered shall be liable to be declared invalid:
-
signs which cannot constitute a trade mark;
-
trade marks which are devoid of any distinctive character;
-
trade marks which consist exclusively of signs or indications which may serve, in trade, to designate the kind, quality, quantity, intended purpose, value, geographical origin, or the time of production of the goods or of rendering of the service, or other characteristics of the goods or service;