To correct an error in a recorded assignment document at the USPTO, you have two main options: Cover sheet corrections: For errors in the cover sheet data only, you can submit a corrective document identifying the reel and frame number where the assignment is recorded and explaining the correction. Errors in the assignment document: For errors in the actual assignment document, you need to record a corrective document. This can be either a new assignment or other document correcting the original assignment. As stated in MPEP 323: "The 'Correction' box on the Recordation Form Cover Sheet should be checked to indicate that the new submission is to correct an assignment already recorded." For more information on assignment correction, visit: assignment correction. For more information on cover sheet, visit: cover sheet. For more information on USPTO, visit: USPTO.