How long does it take to apply for a patent for invention?

Time to apply for invention patent: According to the provisions of China's patent law, there are three kinds of inventions that can be patented: inventions, utility models and designs, of which invention patents are the most important. So how long is the application time for the invention patent? How long does it take to apply for an invention patent? It takes about two and a half years for an invention patent to be applied for and authorized. After obtaining the patent right, the annual fee must be paid according to the regulations. The term of protection of an invention patent is 20 years, counting from the date of application. The invention patent cannot be renewed. Materials to be prepared when applying for an invention patent: 1. Claim: The description of the claimed invention refers to the substantive technical features of the invention. 2. Description: Summarize the invention (within 300 words). 3. Description: Description of the technical field to which the present invention belongs; Explain the background related to the invention; Explain the purpose of the present invention; The technical scheme of the invention is explained in detail; Explain the effect and advantages of this technical scheme; Relevant experiments and data prove its effect and advantages.