Invention patent: 2-4 months for initial trial, 0/.5 to 2.5 years for public trial, and 20 years for protection after trial.
Patent of utility model: the formal examination lasts for 4-6 months, and the protection will be 10 year after the examination.
Appearance patent: formal examination for 3-4 months, protection after examination 10 year.
Summary: The invention patent examination is strict, but the protection period is long and the protection scope is wide. Utility model and appearance patent are only formal examination, so the protection period is only 10 years, and the scope of protection is not as wide as that of invention. What needs to be added is that the patent must pay an annual fee. If the annual fee is not paid, the patent will have no rights and will not provide protection.
Remarks: Patents have to pay an annual fee every year. The patent is valid after paying the annual fee, and it will not be protected without paying the annual fee. The annual fee increases with time. In some fields, patents also have different policies, such as patent mortgage, patent risk fund protection, government patent subsidies and so on.
References: /wxzl/ Bao Gong/2009-02/05/content _1505227.htm? Article 42 of the patent law