302.02 Multiple Copies of Documents Should Not Be Filed
37 C.F.R. §2.193(g)(2)
Parties should not file duplicate copies of correspondence in a single application, registration, or proceeding file, unless the Office requires the filing of duplicate copies. The Office may dispose of duplicate copies of correspondence.
As a general rule, only one copy of each document should be filed, unless more than one copy is specifically required by statute or rule, or a USPTO employee specifically requests more than one copy.
When filing a document electronically or by fax, a party should notsend a follow-up copy unless the USPTO specifically requests a follow-up copy. 37 C.F.R. §2.193(g)(2). Submission of duplicate documents can delay processing. See In re Allegiance Staffing, 115 USPQ2d 1319, 1323 (TTAB 2015)(discouraging the submission of duplicate filings because "it merely adds to the bulk of the file and makes it more difficult to review the submissions").