Sigma was founded in 1996, possesses 20 national invention patents and multiple intellectual properties. All the patent technology has been industrialized, applied to the company development and got good social benefit. Sigma is the High-Tech Enterprise assessed by the Science and Technology Department of Henan Province and Advanced Unit for Intellectual Property assessed by government. 

The rotary bell-type furnace with bottom heating developed by Sigma cooperating with Shanghai Silicate Institute of Chinese Academy Sciences is assessed as Science and Technology Results by the expert panel in 2007. Meanwhile, provided more than ten high-temperature furnaces to the Shanghai Silicate Institute, which are worth more than 2 million Yuan RMB. And this project has been visited by Chinese lea