Patent ID: 7476369

Claim:
In a steam on demand generator comprising a cup assembly, a heating device for heating the cup assembly and an interior thereof, a water injection device for supplying water to the cup assembly, a steam outlet, and a temperature sensor positioned within the cup assembly, wherein water is supplied in quantities so that the interior of the cup assembly remains essentially dry during steam generation, the improvement comprising the cup assembly including a closed bottom thin-walled stainless steel cup formed by a stainless steel thin side wall and a bottom wall connected to the side wall and a stainless steel cap, the side wall, bottom wall, and cap forming the interior, and a hollow cone spray nozzle arranged in the stainless steel cap for supplying water onto an inside surface of the stainless steel thin side wall of the cup, wherein the heating device is brazed to an outside surface of the stainless steel thin side wall of the cup and an end portion of the temperature sensor is brazed to the inside surface of the stainless steel thin side wall of the cup.