What are the different types of national applications in U.S. patent law?

According to MPEP 201.01, there are three main types of national applications in U.S. patent law:

• Original applications: These include both provisional and nonprovisional applications.
• Reissue applications: Filed to correct an error in an already issued patent.
• Reexamination applications: Used to request a review of an existing patent.

The MPEP states: National applications include original (nonprovisional and provisional), reissue, and reexamination applications. Each type serves a specific purpose in the patent application process.

For more information on reissue applications, visit: reissue applications.