Patents restrict what others can do, but the lack of a patent in one country (or jurisdiction, e.g., Europe) cannot give rights to someone in another country. Thus, using your example, the fact OLED products can be legally manufactured in Japan and Korea would not enable those products to be brought into the U.S. if they are covered by a valid U.S. patent.
Answered on Dec 07th, 2011 at 3:53 PM