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Ipglossary.com is a practical glossary for managers, executives and technologists as well as lawyers working in IP in an international environment. The glossary provides practical explanations of key legal and business terms in a large number of technology related fields including intellectual property, licensing, venture capital, corporate and securities law, antitrust and competition law, and of course terms relevant to technology, in general. Read more
A patent held by a third party that blocks commercial exploitation of a first patent, i.e., an essential patent vis-à-vis the invention in the first patent. The usual solution is for both patent-holders to agree to a cross license, often royalty-free. Frequently, when a company is faced with the risk that a competitor will secure a pioneer patent (because it has, for instance, seen the published application) it will seek to obtain blocking patents on essential improvements.