Reminder: It is the responsibility of the patentee to ensure maintenance fees and any applicable surcharges are paid timely to prevent expiration of the patent. If the maintenance fee is not paid within the first six months in the year in which it can be paid, a Maintenance Fee Reminder notice is sent from the USPTO to the fee address or correspondence address on record.
If the maintenance fee and any applicable surcharge are not paid by the end of the 4th, 8th, or 12th years after the date of issue, the patent rights lapse and a Notice of Patent Expiration is sent from the USPTO to the fee address or correspondence address on record.
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