37 CFR §1.314

If applicant timely pays the issue fee, the Office will issue the patent in regular course unless the application is withdrawn from issue (§ 1.313) or the Office defers issuance of the patent. To request that the Office defer issuance of a patent, applicant must file a petition under this section including the fee set forth in § 1.17(h) and a showing of good and sufficient reasons why it is necessary to defer issuance of the patent.