Section 4935. Patent fees may be paid to the Commissioner of Patents, or to the Treasurer, or any of the assistant treasurers of the United States, or to any of the designated depositories, national banks, or receivers of public money, designated by the Secretary of the Treasury for that purpose; and such officer shall give the depositor a receipt or certificate of deposit therefor. All money received at the Patent-Office, or from any source whatever, shall be paid into the treasury as received, without any deduction whatever.

Refunding

Section 4936. The Treasurer of the United States is authorized to pay back any sum or sums of money to any person who has, through mistake, paid the same into the treasury, or to any receiver or depository, to the credit of the treasury, as for fees accruing at the Patent-Office, upon a certificate thereof being made to the Treasurer by the Commissioner of Patents.