I am guessing that Ruyan uses the same or similar cartridge design if there was a "juice" injector, say if the force of suction on the butt, pushed a piston forward, it is possible that modification in conjunction with a redesigned atomizer, could justify it's own patent. I don't know if Ruyan's patent claims are to the entire e-cigarette as a delivery system or if a significant change to the internal components would be enough.