37 CFR §41.33

1. (a)Amendments filed after the date of filing an appeal pursuant to § 41.31(a)(1) through (a)(3) and prior to the date a brief is filed pursuant to § 41.37 may be admitted as provided in § 1.116 of this title.
2. (b)Amendments filed on or after the date of filing a brief pursuant to § 41.37 may be admitted:
   1. (1)To cancel claims, where such cancellation does not affect the scope of any other pending claim in the proceeding, or
   2. (2)To rewrite dependent claims into independent form.
3. (c)All other amendments filed after the date of filing an appeal pursuant to § 41.31(a)(1) through (a)(3) will not be admitted except as permitted by §§ 41.39(b)(1), 41.50(a)(2)(i), and 41.50(b)(1).
4. (d)
   1. (1)An affidavit or other Evidence filed after the date of filing an appeal pursuant to § 41.31(a)(1) through (a)(3) and prior to the date of filing a brief pursuant to § 41.37 may be admitted if the examiner determines that the affidavit or other Evidence overcomes all rejections under appeal and that a showing of good and sufficient reasons why the affidavit or other Evidence is necessary and was not earlier presented has been made.
   2. (2)All other affidavits or other Evidence filed after the date of filing an appeal pursuant to § 41.31(a)(1) through (a)(3) will not be admitted except as permitted by §§ 41.39(b)(1), 41.50(a)(2)(i), and 41.50(b)(1).