Coors ware was made by the Coors Porcelain Company of Golden, Colorado, a company founded with the help of the Coors Brewing Company. Its founder, John Herold, started the Herold China and Pottery Company in 1910 on the site of a glassworks owned by Adolph Coors, the founder of the Coors brewery. The company began making art pottery using clay from nearby mines. Adolph Coors Company bought Herold China and Pottery Company in 1915. Chemical porcelains were made beginning in 1915. The company name was changed in 1920, when Herold left. Several lines of dinnerware were made in the 1920s and 1930s. Marks on dinnerware and cookware made by Coors include Rosebud, Glencoe Thermo-Porcelain, Colorado, and other names. Coors stopped making nonessential wares at the start of World War II. During World War II, Coors made porcelain-like nose cones for rockets for the U.S. military. After the war, the pottery made ovenware, teapots, vases, and a general line of pottery, but no dinnerware---except for special orders. In 1986 Coors Porcelain became Coors Ceramics. In 2000, Coors Ceramics changed its name to CoorsTek. The company is still in business making industrial porcelain. For more information, explore our identification guides for dinnerware patterns, porcelain, and advertising.