Pyrex Know those fairly indestructible kitchenware sets that used to be laden with ugly green flowers in the 1970s but have become clear must-haves for modern homes? It's been made here since 1915 and produced in Charleroi, Pa., since the 1940s. Though original parent company Corning has since relinquished it, current masters World Kitchen are based just outside of Chicago. It's estimated that 80% of American homes have at least one Pyrex product in their kitchens. Nearly as many homes have thanked the heavens for it after a quick soak helped their Pyrex cookware recover from an overcooked casserole or lasagna.