37 CFR § 2.77 - Amendments between notice of allowance and statement of use.
(a) The only amendments that may be entered in an application between the issuance of the notice of allowance and the submission of a statement of use are:
(1) The deletion of specified goods or services, or the entire description of the nature of the collective membership organization, from the identification;
(2) The deletion of a basis in a multiple-basis application; and
(3) A change of attorney or change of address.
(b) Other amendments may be entered during this period only with the express permission of the Director, after consideration on petition under § 2.146. If the Director determines that the amendment requires review by the examining attorney, the petition will be denied and the amendment may be resubmitted with the statement of use in order for the applicant to preserve its right to review.