Regulations under the PCT
The international application shall not contain:
(iii) statements disparaging the products or processes of any particular person other than the applicant, or the merits or validity of applications or patents of any such person (mere comparisons with the prior art shall not be considered disparaging per se);
The receiving Office, the International Searching Authority, the Authority specified for supplementary search and the International Bureau may note lack of compliance with the prescriptions of Rule 9.1 and may suggest to the applicant that he voluntarily correct his international application accordingly, in which case the receiving Office, the competent International Searching Authority, the competent Authority specified for supplementary search and the International Bureau, as applicable, shall be informed of the suggestion.
9.3 Reference to Article 21(6)