First, in general, 20 years. Second, take the priority procedure. In 2 1 year, the priority can be put forward within the 1 year of application, so the actual validity period of the invention patent is 2 1 year. Note that after the priority is obtained, the protection period of the later application is calculated from the date of filing, which is still 20 years in jurisprudence. However, due to the delay of 1 year, it actually got 26438 years.
Legal objectivity:
Unless otherwise agreed, the right to apply for a patent belongs to the invention-creation jointly completed by two or more units or individuals, or the invention-creation entrusted by other units or individuals. After the application is approved, the applicant unit or individual shall be the patentee.