Saint Kitts and Nevis became the 128th Contracting State of the Patent Cooperation Treaty (PCT) when it deposited its instrument of accession at WIPO on July 27, 2005. The Treaty will enter into force for Saint Kitts and Nevis on October 27, 2005.

The accession by Saint Kitts and Nevis means that in any international application filed on or after October 27, 2005, Saint Kitts and Nevis (country code: KN) will automatically be designated, and, as Saint Kitts and Nevis will be bound by Chapter II of the Treaty, will automatically be elected in any demand for international preliminary examination filed in respect of an international application filed on or after October 27, 2005.

Also, as of that date, nationals and residents of Saint Kitts and Nevis will themselves be able to file PCT applications.