Henan. According to Qichacha, Yang Zhanggui is a brand trademark registered by Henan Zhanggui Food Co., Ltd. at the Trademark Office on March 20, 2006. Henan Zhanggui Food Co., Ltd. was established in June 2004 with a registered capital of 20 million yuan. It is a large-scale grain deep processing enterprise integrating food research and development, production and sales.