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问题	专利期限有多长时间
释义	法律分析：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。专利权期限是指专利权的法定期满终止时间。从专利权授权公告之日起，如无因其它事由造成专利权终止的，则该专利权到专利权期限届满之日终止。法律依据：《中华人民共和国专利法》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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