A more thorough explanation:

The Application Division is a department within the U.S. Patent and Trademark Office that handles the process of accepting patent applications. This includes assigning serial numbers, checking for completeness and formalities, placing them in file wrappers, and assigning them to appropriate art groups based on the class and subclass of technology.

For example, if someone invents a new type of smartphone, they would submit a patent application to the Application Division. The division would then review the application to ensure it meets all the necessary requirements and assign it a serial number. The application would then be placed in a file wrapper and assigned to the appropriate art group based on the technology involved.

Another example could be a new type of medical device. The inventor would submit a patent application to the Application Division, which would then review the application and assign it a serial number. The application would then be placed in a file wrapper and assigned to the appropriate art group based on the technology involved.

These examples illustrate how the Application Division is responsible for managing the patent application process and ensuring that all applications are properly reviewed and assigned to the appropriate art groups.