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。

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Revising, writing or assisting in writing teaching materials without demanding any financial request during the valid duration of this contract.

在本合同有效期内，修改，编写或协助编写教案且不要求报酬。

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Their tickets will be valid for twice the duration of other drivers and the council said it would work to make pay-and-display machines more accessible.

BBC: Woodbridge Market Hill

Some may want to hold it for the duration, and that is a valid strategy.

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