who makes a self heating can?

Question

either what food companies sell them or what companies make the can.

Answer 1

OnTech Delaware Inc., San Diego

Can construction
The OnTech self-heating container is built from two main parts: the container and the actuating “puck.” The container comprises an inner cone that holds calcium oxide (quicklime), and the outer container body, which holds the beverage product. The puck holds water and is sealed by a foil membrane.

The container is heated when the consumer pushes a button on the bottom of the container, breaking an inner seal that allows water to pass into the heating cone where it mixes with calcium oxide. Once these materials combine, an exothermic reaction occurs and the heating process begins. Approximately six to eight minutes after activating the container, a thermal ink spot indicates when the product is ready for consumption.

The container heats beverages to approximately 145º F for a minimum of 20 minutes and keeps the beverage warm for up to an hour.

http://www.fdp.com/content.php?s=BI/2006/03&p=13

see also: http://www.fdp.com/content.php?s=BI/2004/06&p=14