(a) In General.—If it appears that an applicant is entitled to a patent under the law, a written notice of allowance of the application shall be given or mailed to the applicant. The notice shall specify a sum, constituting the issue fee and any required publication fee, which shall be paid within 3 months thereafter.

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(b) Effect of Payment.—Upon payment of this sum the patent may issue, but if payment is not timely made, the application shall be regarded as abandoned.