MPEP 601.04
National Stage Requirements of the United States as a Designated Office
Ninth Edition of the MPEP, Revision 10.2019, Last Revised in June 2020
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601.04 National Stage Requirements of the United States as a Designated Office [R-08.2012]
See MPEP Chapter 1800, especially MPEP § 1893.01 for requirements for entry into the national stage before the Designated Office or Elected Office under the Patent Cooperation Treaty (PCT).