?期满
... Withdrawals, Refusals,etc.：撤回、驳回等 Expiries：期满 Lapses(non payment of fees)：专利失效(未缴交续期费) ...
缓存周期
Pfizer says that patent expiries are only one reason why it is cutting manufacturing.
FORBES: Lipitor Factory Is One Pfizer Casualty
Growth in pain drug Lyrica, however, will partly offset the revenue loss due to patent expiries.
FORBES: Pfizer Q4 Earnings Preview: Pain From Patent Expirations To Continue
Investors expecting the price of the underlying to continue to pull back snapped up put options across multiple expiries.
FORBES: AOL Left Out In The Cold As U.S. Stocks Relish Reprieve
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