... 专利未决 patent pending 专利有效期 term of a patent ； duration of the patent right 专利证书 patent certificate ...
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If the valid duration of the patent right expires or the patent right is declared invalid, the patentee may not conclude a patent exploitation license contract relating to that patent with others.
专利权有效期限届满或者专利权被宣布无效的，专利权人不得就该专利与他人订立专利实施许可合同。
Article 44. In any of the following cases, the patent right shall cease before the expiration of its duration.
第四十四条有下列情形之一的，专利权在期限届满前终止。
How long is the duration of patent right for an invention according to the law?
根据这个法律。发明专利权的期限是多久？
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