我要在这里向同学们介绍「阻挡专利（blocking patent）这一词。原则上，所有发明的专利保护都有阻挡性，因为要有「阻挡权才可以收费。
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◎ 如果发现关键专利技术，形成所谓「阻碍性专利(blocking patent)，则我方 企业之因应策略有几种：一、寻求专利权人之授权，二、无法取得授权时， 考虑另行开发可替代性之技术（可回避专利权范围...
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blocking-off patent 阻碍性专利
However numerous patent disputes, and a blocking attempt by the radio Corporation of America, who thought it would destroy AM radio, halted its advancement.
但是很多对于专利的争议，以及美国的收音机公司对此的阻挠(他们认为调频收音机的发明会毁了调频广播)使之前的进步趋于停滞。
youdao
Sony did file a patent for used-games blocking technology, but apparently that had nothing to do with the Playstation 4.
FORBES: Don't Worry, PS4 Will Play Used Games
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