What subject does MPEP 1400 cover?

MPEP 1400 specifically addresses the processes involved in the correction of issued patents. This section is critical for understanding the mechanisms available to rectify errors in patents post-issuance, including typographical mistakes, incorrect drawings, and other deficiencies that may affect the clarity or enforceability of the patent. The rule also outlines the procedures and requirements necessary for filing a correction and the circumstances under which such corrections are permissible.

This focus on corrections highlights the importance of maintaining the accuracy and reliability of patent documents, ensuring that patent rights are clear and enforceable. While the other options relate to significant aspects of patent practice—such as patent applications, patent grants, and appeals—they do not specifically pertain to the processes for correcting issued patents, which is the central theme of MPEP 1400. Understanding this section is essential for practitioners who may need to navigate the complexities of post-issuance patent corrections and their implications for patent rights.