What is the main subject covered in MPEP 400?

The main subject covered in MPEP 400 is related to Power of Attorney. This section delves into the procedures and requirements for granting authority to individuals or entities to act on behalf of the patent applicant, which includes filing applications, responding to office actions, and other related duties. Understanding the nuances of Power of Attorney is crucial for patent practitioners as it establishes who has the authority to represent the applicant before the United States Patent and Trademark Office (USPTO), ensuring that communications and legal obligations are properly managed.

The significance of this material often extends to aspects such as the formalities required for executing a Power of Attorney, the implications of granting it, and how it affects the representation of the applicant throughout the patent application process. Familiarity with this topic is essential for those involved in patent prosecution, as it lays the groundwork for effective interactions with the patent office.