What constitutes “unintentional delay” in paying maintenance fees?

“Unintentional delay” in paying maintenance fees is a crucial concept for reinstating expired patents. According to MPEP 2590: “A person seeking reinstatement of an expired patent should not make a statement that the delay in payment of the maintenance fee was unintentional unless the entire delay was unintentional, including the period from discovery that the…

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How can I file a petition for delayed payment of maintenance fees?

To file a petition for delayed payment of maintenance fees, follow these steps according to MPEP 2590: Use form PTO/SB/66, available on the USPTO forms website. Mark the front page of the communication “Attention: Office of Petitions”. Address the petition to:Mail Stop PetitionCommissioner for PatentsP.O. Box 1450Alexandria, Virginia 22313-1450 Include the required maintenance fee, petition…

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