this is another patent for a welding device, filed by Dennis Klein,
http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=6,689,259
it doesnt explain the hho gas though
i was wondering, could hydrogen potentially have a negative charge?
it would still have a noble gas orbitals.
i also read somewhere that H3O ions have been detected in common water in quanties in the order of parts per trillion. i would expect these ions to have quite a lot of excess energy.
i think the reaction of hho is self sustaining, but requires a catalyst to reach high temperatures, i'm probably wrong.
however, consevation of energy would say, this is faked.
just because theres a patent doesnt mean it works, i've seen patents for gravity produced by static electricity in high voltage capacitors.
as for a cold nossle, a flame from a propane aerosol doesnt light back to the nossle, the flame front has a maximum speed which is exceeded by the propane jet at the nossle, so the nossle stays cold.