无效期的意思就是一个东西存在在有效期之后的时期。比如爱情的无效期就是结婚十年以后。
季票无效期为三个月。
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。
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.
副本与原件一样，只有一份，套印无效。有效期至。
This copy is the same as the original one only for file. Overprinting is invalid. Valid to XX.
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