First to file and first to invent
| Patent law | 
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| Overviews | 
| Procedural concepts | 
| Patentability requirements and related concepts | 
| Other legal requirements | 
| By region / country | 
| By specific subject matter | 
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First to file and first to invent are legal concepts that define who has the right to the grant of a patent for an invention. Since March 16, 2013, after the United States abandoned its "first to invent/document" system, all countries have operated under the "first-to-file" patent priority requirement.