A Patent grants the right to exclude others from making, using, offering for sale or selling the invention throughout the United States or importing the invention into the United States. If you want protection in other countries, you have to file in other countries. You can file a PCT application, which allows you to file in one country and then pick countries that you would also like rights in. This delays some of the costs; however, you will still have to prosecute the patent in those countries if you want protection. You can pick and chose countries (ie pick the ones that would most likely infringe) but if you want protection, you need to actual get the protection.
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