Patent ID: 7677681

Claim:
A refrigerator, comprising: an outer casing that defines an external appearance of the refrigerator; an inner casing having an open upper face, wherein the inner casing is installed within the outer casing so as to define a storage space therein, wherein the inner casing comprises: a casing upper portion having open top and bottom faces and four closed lateral side faces; and a separate casing lower portion having an open top face, a closed bottom face, and four closed lateral side faces, wherein an outer peripheral portion of the open top face of the casing lower portion is coupled to a corresponding outer peripheral portion of the open bottom face of the casing upper portion so as to form the storage space within the inner casing, and wherein a material of the casing lower portion has a lower thermal conductivity than a material of the casing upper portion; and a door that selectively opens and closes the open upper face of the inner casing.