Do I need to apply to others to use their patents (the protection period has passed)?

The patentee adopted the strategy of using the patent right. After the protection period of 10 years, the utility model has entered the public domain. You can use the expired utility model patent technology without going through him or paying for it. In this case, he will never imitate the appearance of the patented product obtained through the utility model patent, otherwise it will easily constitute infringement of the appearance patent. There is a great difference between applying for a patent for utility model and applying for a patent for the appearance of the same product. 9 1 The main purpose of applying for utility model patent is to obtain the bright spot in the product, that is, the invention point (which has substantial characteristics and progress compared with traditional products), 0 1 The main purpose of applying for appearance patent is to characterize the appearance of the product and protect its appearance.