303.02(b)    Permitted Paper Filings: USPTO "Mail Room Date" Label Showing Receipt

The USPTO places a label indicating the date of receipt on every application, part of an application, amendment, letter, or other permitted paper filing (see TMEP §301.02).  The label is referred to as the "Mail Room Date" label, and it establishes the date of receipt (i.e., the filing date) of the paper-filed document.  The documents are then scanned and added to the relevant application or registration record, and the prosecution history is updated accordingly.