US Patent 8424985 Refrigerator with a door-in-door

A refrigerator includes a cabinet configured to define an exterior boundary of the refrigerator. The refrigerator also includes a first storage chamber configured to store food stuffs and a first door configured to open and close the first storage chamber. The refrigerator further includes a second storage chamber defined at a side of the first door, and configured to enable access to food stuffs while the first door remains closed and a second door located in a predetermined portion of the first door, and configured to open and close the second storage chamber, wherein a rotation direction of the second door is identical to a rotation direction of the first door.