 By the mid-1920s, millions of boxes were sold each year.In the early 1960s, the Kansas City, Missouri-based Uhlmann Company, owner of the Standard Milling Company, purchased both the Wheatena corporation and Highspire Flour Mills, which for several years had been supplying the 100% cracked wheat used in the cereal.Uhlmann moved Wheatena manufacturing to Highspire, Pennsylvania in October 1967.