- duration of patent
- period of a patent
- term of a patent
- 专利: patent
- 有效期: term of validity; period of ...
- 有效期已满的专利: expired patent; lapsed patent
- 有效期: term of validity; period of validity 延长合同的有效期 prolong the contract's period of validity; 这个胶卷已过了有效期。 this film has passed its expiry date
- 有效性，有效期: validity
关注微信公众号：chachacidian，回复:专利有效期，即可在微信中查询翻译
