Patent ID: 7240720

Claim:
A pliable two phase single wall heat transfer device for use in contacting and drawing heat away from a substance, said heat transfer device comprising (a) a plurality of matrix units each including (i) an outer wall circumscribing and enclosing an inner space; (ii) a first heat-exchange composition in said inner space and comprising a first liquid which undergoes a change of state from the liquid phase to the solid phase at a selected temperature of transformation; (iii) a plurality of spaced apart hollow fluid tight containers connected to a portion of said wall, extending from said wall into said inner space and in fluid communication with each other, each of said hollow containers including a pliable thin-walled top portion having a wall with a substantially uniform thickness of less than about two millimeters thick, a thin-walled side having a substantially uniform thickness of less than about two millimeters thick and interconnecting said top portion and said floor and extending away from said floor at an angle in the range of seventy-five to one-hundred and five degrees, an outer height in the range of one-quarter of an inch to one inch, an outer width in the range of one-quarter of an inch to one inch such that the ratio of said height to said width is in the range of 5:1 to 1:5 and each of said hollow container has dimensional parity, an inner fluid containing space having a inner height and an inner width and having dimensional parity, an outer surface area contacting said first liquid, and a base having a surface area, said hollow containers collectively having a total base surface area equivalent to the sum of the surface areas of all of said hollow containers, said hollow containers spaced apart a distance in the range of one-quarter to three-quarters of an inch, 55% to 100% of said outer surface area of each of said hollow containers contacting said first liquid, said floor portion having a total surface area intermediate said hollow containers, the ratio of said total surface area to said total base surface area being in the range of 1:3.5 to 10:1; and, (iv) a second heat-exchange composition in each of said hollow containers comprising a liquid which undergoes a change of state from the liquid phase to the solid phase at a selected temperature of transformation; and, (b) a fastening system for interconnecting said matrix units along at least a pair of separate spaced apart lines of weakening to enable said heat transfer device to be mounted over the shoulders and around the neck of an individual.