What are the two methods to revive an abandoned patent application?

The correct choice highlights the two methods for reviving an abandoned patent application: unintentional and unavoidable revival.

Unintentional revival pertains to circumstances where the abandonment was due to a failure to respond to an Office Action or other communication, and the applicant did not intend to abandon the application. The United States Patent and Trademark Office (USPTO) allows for the revival of such applications if the applicant can demonstrate that the abandonment was unintentional.

Unavoidable revival, on the other hand, refers to situations where the applicant can prove that the abandonment was not only unintentional but also due to circumstances beyond their control, such as severe illness or an unavoidable delay. This category provides the applicant with an avenue for reviving the application when they can substantiate their claims of unavoidable circumstances.

Reviving an abandoned patent application is essential for applicants who wish to maintain their intellectual property rights and continue with the prosecution of their application.

The other choices do not accurately reflect the established terminology and processes set forth in the MPEP for reviving abandoned patent applications, hence they are not correct.