Pretty certain it's based on the negatively charged principle vs. other systems that positively pressurize to deliver the nutrient solution to each module. The solution is displaced by negative as opposed to positive flow.
......But with that said it shouldn't be possible to patent anything that could be helpful to someone in need. But I must say that most people with a problem with those who patent ideas are haters...including me. LOL
BTW...where them pics at JK?