The Rival Company from Sedalia, Missouri, bought Naxon in 1970, acquiring Naxon’s 1940 patent for the bean simmer cooker. Rival asked inventor Robert Glen Martin, from Boonville, Missouri, to develop Naxon’s bean cooker into a large scale production model which could cook an entire family meal, going further than just cooking a bean meal. Martin also designed and produced the mass-making machines for Rival’s manufacturing line of the Crock-Pot. The cooker was then reintroduced under the name "Crock-Pot" in 1971. In 1974, Rival introduced removable stoneware inserts, making the appliance easier to clean. The Crock-Pot brand now belongs to Newell Brands.