Paper products giant Kimberly-Clark must answer claims that it attempted to monopolize the markets for disposable baby diapers and training pants now that a federal judge has refused to dismiss allegations that it maintained a dominant market share by fraudulently procuring patents and waging “sham” patent lawsuits.

In his 12-page opinion in Kimberly-Clark Worldwide Inc. v. First Quality Baby Products , U.S. District Judge William W. Caldwell found that the antitrust claims lodged against Kimberly-Clark alleged a valid theory of anti-competitive conduct.