Refrigerating package
916,263. Refrigerating. KWIK-KOLD OF AMERICA Inc. Feb. 15, 1960, No. 5339/60. Class 29. An endothermic-action refrigerating package consists of a partially-evacuated, transparent, outer, plastic envelope 20 containing a refrigerating chemical 24, a water-soluble dye, and an inner water-containing plastic envelope 22 which is weaker than envelope 20 so that it can be ruptured by pressure without rupturing the outer envelope. The partial vacuum is produced by inserting the chemical, dye and envelope 22 in envelope 20, squeezing the air out of the upper part of the envelope 20 as shown in Fig. 3 and then applying a heat seal 30 to the upper end of the latter.