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First to file (FTF) and first to invent (FTI) are legal concepts that define who has the right to the grant of a patent for an invention. Since 16 March 2013, after the USA abandoned its "first to invent/document" system, all countries operate under "first-to-file" patent priority requirement.
There is an important difference between the strict nature of the FTF under the European Patent Office (EPO) and the FITF (First inventor to file) system of the United States Patent and Trademark Office (USPTO). The USPTO FITF system affords early disclosers some "grace" time before they need to file a patent, whereas the EPO does not recognise any grace period, so early disclosure under the FITF provisions is an absolute bar to later EPO patent.