Arel's patent

1. Arel, Jing Liu, Zhang Yinping and Di Hongfa. An electric heater, utility model, patent number: ZL 2003 2 0 129 737.0.

Zhang Yinping, Ariel, Lin Kunping, Xu Xu. A phase change material, invention patent, application number: 03 13724 1.4, publication number: CN 1460702A.

13. Zhang Yinping, Arel, Di Hongfa, Jing Liu. A regenerative electric water heater, a utility model, patent number: ZL 2003 2 0 129736.6.