Which of the following is a necessary document to apply for PPH?

To apply for the Patent Prosecution Highway (PPH), a petition or request for PPH is essential. This document formally initiates the PPH process, indicating the applicant's desire to expedite examination based on an earlier favorable decision on the same application or a corresponding application in a foreign jurisdiction.

The PPH allows patent applicants to fast-track the examination of their patent application in a participating country, leveraging the examination results from another participating patent office. The request must meet specific criteria established by the relevant patent offices, and it outlines the basis for the expedited examination, thereby enabling a smoother and swifter prosecution process.

Other options provided do not fulfill the requirements necessary for the PPH application. A fee schedule is not typically necessary for the core request, although some jurisdictions may require fees associated with filing. A copy of previous submissions may be useful to the examiner but does not serve as a required document for the PPH request itself. Similarly, a declaration of inventorship, while important in patent applications, is not a prerequisite specifically for the PPH process.