The Patent Law Treaty (PLT) is a treaty signed on 1 June 2000 in Geneva, Switzerland, by 53 States and the European Patent Organisation (an intergovernmental organization). It entered into force on April 28, 2005. It aims at harmonizing and streamlining formal procedures such as the requirements to obtain a filing date for a patent application, the form and content of a patent application, and representation. The treaty "does not establish a uniform procedure for all parties to the PLT but leaves parties free to require fewer or more user-friendly requirements than those provided in the PLT."[1] As of February 2023, the PLT had 43 contracting states.[2]