Ping Zeng's patent

1. Piezoelectric inertial stepping driver with positive pressure change on contact surface China National Intellectual Property Administration, August 2007.152. China National Intellectual Property Administration, Piezoelectric Inertial Stepping Driver, August 2007.153. China National Intellectual Property Administration, Biased Cantilever Piezoelectric Inertial Impact Precision Actuator, May 2, 20081.4. China National Intellectual Property Administration, piezoelectric single-degree-of-freedom precision rotary actuator, March 22, 2006 5. Single vibrator dual-cavity valveless piezoelectric pump, China National Intellectual Property Administration, September 20, 2006. Piezoelectric vibrator active valve piezoelectric pump, China National Intellectual Property Administration, May 7, 2008. Piezoelectric pump with single cavity and two vibrators, China National Intellectual Property Administration, 2006.