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问题	专利权的终止原因是什么
释义	法律分析：专利权的终止原因：(1)没有按照规定交纳年费2)专利权人以书面声明放弃专利权3)专利权期满，专利权即行终止。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。第四十七条宣告无效的专利权视为自始即不存在。
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