How did this get a patent? This is just an linear piston pump [1][2]. You can literally buy fish tank air pumps that use this exact mechanism [3]. The only th

How did this get a patent? This is just an linear piston pump [1][2]. You can literally buy fish tank air pumps that use this exact mechanism [3]. The only thing mildly novel here is that they're driving it both directions via magnets & more complex drive electronics. Most of the commercial versions just use a steel piston, and single-direction actuation because they can then run the electromagnet directly off mains AC to get the cycling action. 1: https://www.techmagpm.com/en/linear-piston/ https://www.techmagpm.com/en/linear-piston/ 2: https://www.nitto-kohki.eu/en/operating-principles-en/linear-piston-pumps.html https://www.nitto-kohki.eu/en/operating-principles-en/linear... 3: https://www.jehmco.com/html/central_air_pumps.html https://www.jehmco.com/html/central_air_pumps.html