"Since the rights granted by a U.S. patent extend only throughout the territory of the United States and have no effect in a foreign country, an inventor who wishes patent protection in other countries must apply for a patent in each of the other countries or in regional patent offices.  Almost every country has its own patent law, and a person desiring a patent in a particular country must make an application for patent in that country, in accordance with the requirements of that country."

(USPTO: General Information Concerning Patents: Treaties and Foreign Patents)

You can find the process for filing for a utility patent application here, and information about fees here.