Food warming by exothermic reaction

Claim 1

A food warmer for a food containing package, said warmer comprising a first container for heat generating elements, a second container for said package and a closure for said second container, said first container comprising a base and sidewall structure forming a fuel chamber having an open side, said heat generating elements comprising a first sealed sack of fracturable film material containing normally dry particles which have an exothermic reaction in the presence of moisture and a second sealed sack of fracturable film material containing water, said sacks being packed adjacent each other in said fuel chamber, said second container comprising a wall structure forming a work chamber having a first opening for reception of the package and a second opening in substantial alignment with the open side of the fuel chamber, complementary progressive engaging means respectively on said first and second containers and piercing means on said second container of length sufficient to progress from a position clear of said sacks when said engaging means is in an initial stage of engagement to a position wherein both said sacks are pierced whereby to enable generation and confinement of hot vapor in the work chamber when the work chamber is closed.