A patent has a different term in different place.  Hong Kong short-term patents can be renewed for up to 8 years from the fourth year after the date of filing.  Standard patents are renewable annually and are valid for up to 20 years.  In China, invention patent is valid for 20 years.  Chinese utility model patents and design patents are valid for 10 years, and they may apply for renewal procedures before the expiration of the validity of the patent.