Can an examiner reject a patent application after it has been allowed?

Yes, an examiner can reject a patent application after it has been allowed. The MPEP 1308.01 states:

“The examiner may withdraw the application from issue because of:

• An amendment under 37 CFR 1.312;
• A printer rush;
• A mistake on the part of the Office;
• A violation of 37 CFR 1.56 or illegality in the application;
• Unpatentability of one or more claims; or
• For interference.”

  This demonstrates that even after allowance, various circumstances may lead to a rejection or withdrawal from issue.

  To learn more:

  • rejection after allowance
  • examiner authority
  • withdrawal from issue