Which scenarios would require filing a new application data sheet for updates?

Filing a new application data sheet is necessary in situations where there are significant changes related to the inventorship of a patent application or claims of priority. The application data sheet serves to provide important bibliographic data, and changes to inventorship can affect who is legally entitled to the patent and their rights. Similarly, changes regarding priority claims, such as the priority date or the application from which priority is claimed, are crucial for determining the patent's scope and validity.

On the other hand, changes related to an applicant's address do not typically require a new application data sheet since address updates can often be handled more informally or through a simple information update without altering the legal substance of the application. This distinction highlights why it is essential to identify when new data sheets are necessary, specifically in cases that influence the rights associated with the patent, like inventorship and priority claims.