What form should I use to petition for acceptance of a late maintenance fee payment?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-30 10 Rules 5 Related FAQs This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice. If you need to petition for acceptance of a late maintenance fee payment, you should use Form PTO/SB/66. According to MPEP 2595 : “Form PTO/SB/66 (“Petition to Accept Unintentionally Delayed Payment of Maintenance Fee in an Expired Patent ( 37 CFR 1.378(b) )”) may be used to file a petition under 37 CFR 1.378(b).” This form is specifically designed for situations where a patent has expired due to unintentional failure to pay a maintenance fee. It allows patent holders to request reinstatement of their patent rights under 37 CFR 1.378(b) . Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Petition for Unintentionally Delayed Maintenance Fee Payment in Expired Patent MPEP 2595 Permitted Petition to Accept Unintentionally Delayed Maintenance Fee Must Include Specific Fees and Statement MPEP 2590 Required Petition for Unintentionally Delayed Maintenance Fee MPEP 2590 Late Payment of Maintenance Fee Permitted After Grace Period If Unintentional MPEP 2590 Permitted Petition for Unintentional Delay of Maintenance Fee Payment MPEP 2590 Required Request for Customer Number Permitted MPEP 2595 Permitted Petition for Unintentional Maintenance Fee Delay MPEP 2590 Petition to Process Unintentionally Delayed Maintenance Fee Payment MPEP 2590 Unintentional Delay in Maintenance Fee Payment MPEP 2590 Permitted Petition to Reinstate Expired Patent with Late Fee Payment MPEP 2590 Permitted Other Related FAQs 5 FAQs Collapse Are the forms mentioned in MPEP 2595 mandatory for maintenance fee submissions? What is a fee address and how do I establish one for maintenance fee purposes? What forms are recommended for submitting maintenance fees? How can I request a customer number for pate...