What ways can an individual attack the enforceability of a patent that relies on the benefit of an earlier filed Patent Cooperation Treaty application (“PCT”)? This article highlights the top five PCT issues that an attorney should look for to successfully defend a client against infringement. The strategies discussed include: (1) searching for new matter; (2) searching for errors in inventorship; (3) examining an international filing date; (4) checking for withdrawal of an international application; and (5) examining estoppel arguments in international applications.
Richard Lazarus, Patent Cooperation Treaty – Implementation v. U.S. Law, 5 J. Marshall Rev. Intell. Prop. L. 641 (2006)