If one "Googles" "steam dishwasher", the patent for the above unit and a few others can be found. Someone has a patent for a newer version of a steam dishwasher said to be an improvement over the Thermador system, and giving better results. IIRC it used some sort of steam injection system, rather than simply "boiling" water on a surface to create steam.
Wouldn't it be cool if somehow a mini-steam boiler, like those used for steam generator irons could be fitted into a dishwasher? Then powerful, hot and dry (over 50psi) steam could be injected or aimed at dishes. That should melt away all but the most stubborn muck! *LOL*