"No claim is made to the exclusive right to use [enter descriptive/generic term(s)] apart from the mark as shown."
HEPA TECH
"The mark has become distinctive of the goods/services through the applicant's substantially exclusive and continuous use in commerce for at least the five years immediately before the date of this statement." Or, "The mark has become distinctive of the goods/services as evidenced by the ownership of U.S. Registration No(s)..