Any inventor who wants patent protection in other countries must apply for a patent in each of the other countries. Each country has its own patent law and inventors must file their application in accordance with the requirements of that country. In many foreign countries, publication of the invention before applying will bar the right to a patent. Many countries also require maintenance fees and require that the patented invention must be manufactured in that country after a certain time period. It is necessary in the case of inventions made in the U.S. to get a license from the Director of the United States Patent and Trademarks Office before applying for a foreign patent.