Depending on the company's own scientific research force, Shandong Huashengqiang Mobile Refrigeration Technology Co., Ltd. applied for seven patents for utility models of bus air-conditioning and one patent for invention of the second generation electric air conditioning to the State Patent Office in 2014. Currently the seven patents for utility models have been approved and granted patent rights, and successfully got patent certificates. One patent for invention is being processed, and now it has entered the real trial stage.