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问题	发明专利保护期有多长时间
释义	发明的专利保护期限为二十年，实用新型专利和外观设计专利的保护期限为十年，均从申请之日起计算。有下列情形之一的，专利权在期限届满前终止：缴纳年费没有按照规定；专利权人放弃其专利权以书面声明的形式。由国务院专利行政部门登记和公告专利权在期限届满前终止。【法律依据】《专利法》第四十二条，发明专利权的期限为二十年，实用新型专利权和外观设计专利权的期限为十年，均自申请日起计算。
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