What marks the effective date of several AIA provisions?

The effective date of several provisions of the America Invents Act (AIA) is September 16, 2012. This date is significant because it marks the enactment of the AIA, which was a comprehensive reform of the U.S. patent system aimed at transitioning the system from a "first to invent" to a "first to file" approach. Many of the key changes established by the AIA, including new procedures for inter partes review and post-grant review, went into effect on this date. Understanding this date is crucial for those involved in patent law and practice, as it represents a pivotal shift in the way patent applications are processed and evaluated in the United States.