Cooling Pack With Low Internal Air Volume

Abstract

An embodiment of is cooling pack 110 having at least two components that cause an endothermic reaction when mixed together. At least one of the at least two components being in liquid form 410 and contained in, or separated from, the other at least one component 430 by a frangible membrane 150. The at least two components ( 410, 430 ) contained within a vacuum sealed common envelope 120. Other embodiments are described and shown.

1 . A cooling pack comprising:
 a. at least two components that cause an endothermic reaction when mixed together;   b. at least one of the at least two components being in liquid than and separated from the other at least one component by a frangible membrane;   c. the at least two components contained within is common envelope;   d. the common envelope being vacuum sealed.   
     
     
         2 . The cooling pack of  claim 1  wherein the common envelope substantially contains no free air. 
     
     
         3 . The cooling pack of  claim 2  wherein the liquid form component contained in, or separated from, the other at least one component by a frangible membrane forms a liquid packet and the liquid packet substantially contains no free air. 
     
     
         4 . The cooling pack of  claim 1  wherein the at least one component in liquid form and contained in, or separated from, the other at least one component by the frangible membrane is fixedly positioned within the common envelope. 
     
     
         5 . The cooling pack of  claim 4  wherein the external surface of the cooling pack includes labeling to indicate the internal position of the at least one component in liquid form. 
     
     
         6 . The cooling pack of  claim 4  wherein the fixed position of the at least one component in liquid form is provided by internal fixation to the common envelope 
     
     
         7 . The cooling pack of  claim 4  wherein the at least one component in liquid form is fixedly positioned within the common envelope by the vacuum sealing of the common envelope. 
     
     
         8 . A method for manufacturing a cooling pack comprising the steps of:
 a. providing a plurality of components that cause an endothermic reaction when mixed together;   b. providing at least one of the plurality of components in liquid form;   c. separating the at least one liquid form component from the remaining plurality of components by a frangible membrane;   d. packaging the plurality of components within a common envelope;   e. vacuum sealing the common envelope.   
     
     
         9 . The method of  claim 8  wherein the step of vacuum sealing substantially removes free air from the common envelope. 
     
     
         10 . The method of  claim 8  wherein the step of separating the at least one liquid form component from the remaining plurality of components by a frangible membrane includes enclosing the liquid form component with a minimum of free air. 
     
     
         11 . The method of  claim 8  wherein the step of separating the at least one liquid form component from the remaining plurality of components by a frangible membrane includes positioning the at least one liquid form component in a predetermined location within the common envelope prior to sealing the common envelope. 
     
     
         12 . The method of  claim 11  including the step of marking the external surface of the common envelope to indicate the internal position of the at least one liquid form component. 
     
     
         13 . The method of  claim 11  wherein the step of positioning the at least one liquid form component in a predetermined location is accomplished by internally affixing the frangible membrane to the common envelope. 
     
     
         14 . The method of  claim 11  wherein the step of positioning the at least one liquid form component in a predetermined location is accomplished by vacuum sealing the at least one liquid form component, separated by the frangible membrane from the remaining plurality of components, in a predetermined position within the common envelope. 
     
     
         15 . A cooling pack comprising:
 a. at least two components that cause an endothermic reaction when mixed together;   b. at least one of the two components being in solid form;   c. at least one of the two components being in liquid form;   d. the liquid form component separated from the other components by a frangible membrane;   e. the frangible membrane with the liquid component fixedly positioned within a common envelope;   f. the external surface of the common envelope marked to identify the position of the liquid form component;   g. the common envelope vacuum sealed to eliminate the free air.