What is the Patent Law Treaty (PLT) and how does it affect U.S. patent applications?

The Patent Law Treaty (PLT) is an international agreement aimed at harmonizing and streamlining formal procedures in patent applications. Its implementation in the U.S. through the Patent Law Treaties Implementation Act (PLTIA) introduced several changes to U.S. patent law, including:

• Restoration of priority rights in certain cases
• Changes to formal requirements for patent applications
• Provisions for international design applications

The MPEP notes: “The Patent Law Treaties Implementation Act of 2012 (PLTIA) amended the patent laws to implement the provisions of the Patent Law Treaty (PLT) in title II; corresponding revisions to title 37 of the Code of Federal Regulations also became effective on December 18, 2013. Notable changes to the law and rules included the restoration of the right of priority to a foreign application or the benefit of a provisional application in a subsequent application filed within two months of the expiration of the twelve-month period (six-month period for design applications) for filing such a subsequent application.”