Whole grains. According to the query related information about cereal flour, it is known that whole grains are cereal flour according to the trademark law. Grains and cereals belong to the 30th category among the 45 categories of trademarks. Important categories: Class 30 Class 30: Cereal products; flour; cereal flour; legume meal; corn meal; cornmeal; barley meal; cake meal; shelled cereals for human consumption, etc.