A container cap for vise with a self-heating tin container having a chemical compound on one end for releasing heat upon mixing with a liquid catalyzer. The container cap has an annular groove on the bottom around the border into which a peripheral flange on a self-heating tin container is inserted for...http://www.google.com.au/patents/US5255812?utm_source=gb-gplus-sharePatent US5255812 - Container cap
