How many years is the duration of the invention patent?

According to relevant laws and regulations, the validity period of an invention patent is 20 years. Pay the annual patent fee every year to keep the patent valid. If the patentee fails to pay the annual fee or the amount paid is insufficient after the year when the patent right is granted, the patentee shall pay the annual fee within six months from the date when the annual fee should be paid at the latest, and pay the late fee at the same time. Legal basis: Article 42 of the Patent Law of People's Republic of China (PRC) has a term of 20 years, and the term of utility model patent and design patent is 10 years, counting from the date of filing.