名词
中文翻译：权利的有效期
同义词：
['validity period', 'validity date', 'entitlement period']
例句：
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1. The company's date of entitlement is set for the end of this year.
该公司的权利有效期定于今年年底。
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2.The patent has a date of entitlement that starts from the day it was granted.
专利的有效期从授予之日起算。
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3.The agreement stipulates that the date of entitlement will be determined by mutual agreement.
协议规定，有效期将由双方协商确定。