The Patent Law Treaty (PLT) is a patent law multilateral treaty concluded on 1 June 2000 in Geneva, Switzerland, by 53 States and the European Patent Organisation (an intergovernmental organization). It aims at harmonizing 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.

As of August 2019, the PLT had 42 contracting states, while 59 states and the European Patent Organisation have signed the treaty.

(wikipedia.org)

• Patent Law Treaty