 The most frequent bases are likelihood of confusion with an existing registered mark and genericness or descriptiveness of the mark for which registration is sought.Rarely, a mark will be rejected as "immoral or scandalous", usually if it contains sexually suggestive terms, or vulgarities, for example the rejection of a logo with a defecating dog in "Greyhound Corp. v. Both Worlds, Inc.", 6 U.S.P.Q.2d 1635.When an Office action is issued, the applicant has six months to respond to the Examiner.