Shandong Hualu Hengsheng Chemical Co., Ltd. announced in a filing with the Shanghai Stock Exchange that they recently lost a patent infringement lawsuit and the Guangdong Higher People’s Court awarded 80 million RMB (~$11.4 million USD) to the plaintiff Sichuan Jinxiang Serui Chemical Co., Ltd. An injunction was also awarded. The patents at suit, ZL201110108644.9 and ZL201010216437.0, cover methods of manufacturing melamine and equipment in the use of manufacturing melamine. China is the world’s largest manufacturer of melamine, which is often used in cookware, eating utensils and flooring.
The two patents are related to melamine production by pressurized gas phase quenching. As the patents explain in the background, conventional melamine manufacturing methods suffer from low production efficiency per unit volume; high power consumption; instability over time of a cold gas blower used in the manufacturing process; and high cost of recycling or utilizing byproducts from the manufacturing process. These problems are overcome via the patented gas-phase quenching methods and systems.
Claim 1 of ZL201110108644.9 reads as follows: