What forms are used for Customer Number practice?

The USPTO provides several forms for Customer Number practice:

• PTO/SB/125 – Request for Customer Number
• PTO/SB/124 – Request for Customer Number Data Change
• PTO/AIA/122 or PTO/SB/122 – Change of Correspondence Address, Application
• PTO/AIA/123 or PTO/SB/123 – Change of Correspondence Address, Patent

According to MPEP 403: “The following forms are suggested for use with the Customer Number practice: (A) the ‘Request for Customer Number’ (PTO/SB/125) to request a Customer Number; (B) the ‘Request for Customer Number Data Change’ (PTO/SB/124) to request a change in the data (address or list of practitioners) associated with an existing Customer Number; (C) the ‘Change of Correspondence Address, Application’ (PTO/AIA/122 for applications filed on or after September 16, 2012, or PTO/SB/122 for applications filed before September 16, 2012) to change the correspondence address of an individual application to the address associated with a Customer Number; and (D) the ‘Change of Correspondence Address, Patent’ (PTO/AIA/123 for applications filed on or after September 16, 2012, or PTO//SB/123 for applications filed before September 16, 2012) to change the correspondence address of an individual patent to the address associated with a Customer Number.”