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 and the International Searching Authority 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. If the lack of compliance was noted by the receiving Office, that Office shall inform the competent International Searching Authority and the International Bureau; if the lack of compliance was noted by the International Searching Authority, that Authority shall inform the receiving Office and the International Bureau.
9.3 Reference to Article 21(6)