As of August 30, 2015, no live official trademarks were found on USPTO.gov for the exact term
Ethanethiol (a.k.a. "stench gas") is a real word, referring to a type of gas valued by the mining industry, which pumps it through mining tunnels to warn miners of impending danger or an outright emergency.
More than that, we do not know, but we have priced it CHEAP.
In any case, we would think that ethanethiol would have some utility in the mining industry.