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失效专利失效专利是指已经失去了法律效力的专利,成为了公有技术,任何人都可以免费使用。虽然在法律上是失效了,但是这项发明并没有失效,依然是
Expired Patent Expired Patent refers to the patent that has lost its legal validity and becomes a public technology that anyone can use for free. Although legally invalid, the invention has not expired and remains