customer number

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Intellectual Property

(previously referred to as "payor number") - a number assigned by the Office that is used to simplify the submission of an address change, to appoint a practitioner, or to designate the fee address for a patent. Customer numbers are primarily used by attorneys and law firms, and must be requested using the "Request for Customer Number" form (PTO/SB/125).

-- see 37 CFR § 1.33(a), 1.76 and MPEP 403 for more

USPTO — United States Patent and Trademark Office Glossary