Patent ID: 7819273
Filing Date: 2010-10-26
Classification: F17C,Y10T

Abstract:
1. A liquid tank, comprising: an interior wall defining a space for containing a liquid, the interior wall comprising a first layer and a second layer opposing the first layer, a wrinkled portion, a non-wrinkled portion, and a coupler, the coupler having first and second surfaces spaced a predetermined distance from each other, wherein the first layer is configured to contact the liquid, and wherein the first layer of the wrinkled portion is coupled to the first surface and the second layer of the wrinkled portion is coupled to the second surface such that the first and second layers of the wrinkled portion are separated by the predetermined distance; an exterior wall; and an intermediate wall interposed between the interior wall and the exterior wall; wherein the non-wrinkled portion further comprises a spacer contacting both the first and second layers, and wherein the spacer is substantially hard such that the spacer substantially maintains a distance between the first and second layers of the non-wrinkled portion; and wherein the wrinkled portion comprises a first wrinkle in the first layer and a second wrinkle in the second layer, wherein the first and second wrinkles are opposing each other.