Hello, would you like to ask when the patent for vegetable crispy roast duck was obtained? The patent for vegetable-flavored roast duck was obtained in 2005. The vegetable-flavored crispy roast duck was invented in 2005 and a national patent was issued. The vegetable-flavored crispy roast duck is based on inheriting traditional crafts and following the "acid-base balance" principle in modern nutrition. , an innovative roast duck developed by .