A deluge of patent applications were filed at the United Stated Patent and Trademark Office on the day before central provisions of the new America Invents Act (AIA) went into effect on March 16, 2013. This rush to file indicates many inventors wish to preserve their patent status under the pre-AIA provisions.
The first-to-file provisions apply to any patent application that contains OR CONTAINED AT ANY TIME a claim having an effective filing date on or after March 16, 2013, and also apply to any patent application claiming priority of another application/patent that contains OR CONTAINED AT ANY TIME such a claim. America Invents Act § 3(n)(1) (emphasis added).