You would not make a lot of money out of it. Especially because you can copy it easily. Every patent must be laid open and last for just 20 years. Not so much if you have to cover the developing and research costs. In addition, the patent forbids only others to sell it, but everybody is allowed to build his own generator.
In spite of everything, I am sure that in the next one or two decades this tecnology is going to be developed and used. But It would go much faster if free energy concepts are promoted and not suppressed.