Manual of Patent Examining Procedure - MPEP

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800 Restriction in Applications Filed Under 35 U.S.C. 111; Double Patenting

823 Unity of Invention Under the Patent Cooperation Treaty

See Chapter 1800 , in particular MPEP § 1850, §  1875, and § 1893.03(d), for a detailed discussion of unity of invention under the Patent Cooperation Treaty (PCT).