I looked at the patents and some stuff on the internet but it seems incoherent. I like the concept but if there is no way to apply it then it's a guessing game at best.
What did you expect from a patent? Aren't they designed with the intention of hiding just enough of the truth, but not too much of the truth, to hide the inner workings yet stand up in court to defend the inventor's or assignee's rights to protection from theft?
So, we'll never know what Fogal intended to do with his invention. All we can do is guess.
But more importantly than authenticating what Fogal did or did not do, is discovering that distortion of the fundamental frequency could lead to a positive feedback not requiring any additional source of power from outside of the system. The distortion, alone, is sufficient to provide the energy for parametrically pumping the harmonics into a frenzy of escalation dragging everything else (fundamental and reactive) along with it.
This is largely inefficient since a huge distortion ends up dwarfing the real power of the system. But, hey, this overall magnification is for free! Though it risks shorting to the nearest ground and definitely fries the system if not regulated (which is not impossible).