With significant changes to law governing how the U.S. grants patents taking effect next month, Porter Wright recommends that all clients consider filing any contemplated patent applications by March 15. This includes filing non-provisional patent applications, and in some cases Patent Cooperation Treaty (PCT) patent applications, that are based upon any provisional or non-U.S. patent application filed since March 2012. Though there are some exceptions to this advice, waiting until after March 15 may be problematic.
In brief: For patent applications having any claim with an effective filing date after March 15, it will no longer be possible to overcome prior art by showing an earlier date of invention. Thus, the prior art for purposes of patentability will include: 1) third-party public disclosures of any kind, anywhere in the world, prior to your effective filing date; and 2) issued U.S. patents and published U.S. or PCT patent applications that were effectively filed before your effective filing date. In addition to not being able to "swear behind" a prior art reference by proving an earlier date of invention, the prior art date for patents and published patent applications may be as much as 18 months earlier than under current law because of foreign priority claims.
It is also important to note that inventors will not lose the benefit of any earlier provisional or non-U.S. patent application should they wait until after March 15 to file. Any claims that are adequately supported in the earlier filing will be entitled to that earlier filing date for purposes of patentability. However, if even one claim in the post-March 15 application is new (i.e., includes subject matter not disclosed in your earlier application) the new first-to-file rules will apply to all claims — and there will be no way to alter this scenario through actions such as deleting claims containing the new subject matter.
A Porter Wright Law Alert describes these patent law changes in greater detail.