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