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U.S. President Obama signs the AIA into law on 16 September, 2011

The final package of the Leahy-Smith America Invents Act (H.R.1249, pdf) will enter into force on 16 March 2013 (for a list of amendments and their effective dates, see here). By this date, the most significant amendments of the new Act will enter into force, namely the transformation from the traditional first-to-invent regime to the new first-inventor-to-file regime.

Besides reducing the USPTO’s backlog of approx. 680.000 patent applications and improving patent quality, the main objective of the America Invents Act is to harmonise the US patent system better with international patent law standards and by that facilitate second filings of US applicants in foreign jurisdictions.

This is indeed a brilliant idea, not only for US applicants but also for European applicants and practitioners, as it will align the US system closer with the European patent system. However, event for those legal instruments that are clearly adapted to the European point of view, important differences remain. Some of those tiny differences that may have a huge impacts on practice are outlined below: 

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