Today in 2011, US Patent 7882975 B2 was issued, an invention of Jason M. Kelly, assigned to Miller Coors, LLC, for his “Double Walled Beverage Container and Method of Making Same.” Here’s the Abstract:

A double walled container is provided for insulating a beverage. An outer insulating shell or container is secured to the inner container that holds the beverage. A gap exists between the outer container and inner container and the air in the gap acts as an insulating barrier. The inner container is preferably a standard aluminum container. The outer container is preferably made from aluminum or a plastic polymer.