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.
索赔需在有效期内提出，原告有权申请仲裁，过期无效。
All claims, presented after the given date, will not be accepted and the claimant will have right to apply for arbitration.
本证明书效期三个月，非供诉讼、兵役使用，未经诊断医师签章及未加盖处印，均属无效。
This certificate is valid for three months and not used for litigation and military service. It is invalid without the seal of hospital and signature of physician.
许可证必须有效期，转移许可证是无效的，除非该工作已经开始。
Permits must have an expiration time. Permits will not be valid for shifts other than the one in which the work started.
所有疗程有效期，由签发日起计十二个月止，逾期无效。
All treatments are valid for use within a 12 month period and expire thereafter.
所有疗程有效期，由签发日起计十二个月止，逾期无效。
All treatments are valid for use within a 12 month period and expire thereafter.
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