By eHow Legal Editor
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When you patent an invention in one country, it's critical to understand that the patent holds for only that country. To make your U.S. patent valid in Canada, you must apply separately to Canada to obtain a Canadian patent. Thanks to the treaty known as the Paris Convention for the Protection of Industrial Property, you have a head start for patent protection in Canada, which allows for a 12-month preprotection of sorts, known as "convention priority." Read on to learn more.