Where can I find detailed information about unity of invention under the Patent Cooperation Treaty (PCT)?

Detailed information about unity of invention under the Patent Cooperation Treaty (PCT) can be found in MPEP Chapter 1800. Specifically, the following sections provide in-depth discussions:

• MPEP § 1850
• MPEP § 1875
• MPEP § 1893.03(d)

As stated in MPEP 823: “See MPEP 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).”

To learn more:

• Unity of Invention
• PCT
• Patent Cooperation Treaty
• MPEP Chapter 1800