S.L. 597.4 Art. 86Filing of a notice for declaration of invalidity of a trademarkbasedon article 5 of the Act. 

(1) A notice for declaration of invalidity of a trademark based on article 5 of the Act may be filed by any natural or legal person and any group or body set up for the purpose of representing the interests of manufacturers, producers, suppliers of services, traders or consumers, and which, under the terms of the law governing them, have the capacity to sue or be sued in their own name.

(2) When filing a notice for declaration of invalidity of a trademark based on article 5 of the Act, such declaration shall be accompanied by the prescribed fee and shall contain:

(a) a clear indication of the absolute grounds under article 5 of the Act on the basis of which the notice for declaration of invalidity is being filed;

(b) the registration number of the trademark against which the notice for declaration of invalidity is being entered and the name of the owner of the trademark;

(c) the name and address of the applicant filing the notice for declaration of invalidity and of his representative, when a representative is appointed;

(d) a reasoned statement on the grounds, the facts and arguments on which the notice for declaration of invalidity relies, and any supporting evidence which may be available.