Is there a patent for the ancient case?

There is no patent for ancient patterns. In ancient times, some patterns may be family emblems or symbols of some powerful people at that time, such as dragons. These patterns can't be used indiscriminately and will be beheaded. Today, these models have long since disappeared. As long as the pattern you see is not registered in the patent office (you can apply for a patent by making some changes to the previous pattern and packaging), you can use it as you want.