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问题	发明专利权的期限是多久
释义	法律分析：发明专利权的期限是二十年。自申请日起开始计算，依照相关法律规定，获得发明专利的专利权人需要在被授予专利权的当年开始缴纳年费，不按规定缴纳的，其专利权在期限届满前会被终止。专利权人应当自被授予专利权的当年，开始缴纳年费。专利权人以书面声明放弃其专利权的，专利权在期限届满前终止的，由国务院专利行政部门登记和公告。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，实用新型专利权的期限为十年，外观设计专利权的期限为十五年，均自申请日起计算。
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