Maintenance fees coming due
3 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Apr 22, 2027. Unpaid by Oct 22, 2027, that one lapses early.
A maintenance fee does not end a patent on its due date. It falls due at 3.5, 7.5
and 11.5 years from grant, and the patent lapses only if the fee is still unpaid at the end of the
six month grace period that follows.
| Patent | Title | Holder | Status | Fee due | Lapses if unpaid | Expires | Confidence |
|---|---|---|---|---|---|---|---|
| US 10,451,373 | Firearm Barrel In force Fee due Apr 22, 2027 Lapses if unpaid Oct 22, 2027 · Medium confidence | Zev Technologies, LLC | In force | Apr 22, 2027 | Oct 22, 2027 | Medium confidence | |
| US 9,239,208 | Integrated Leveler and Rail Platform Assembly for a Firearm In force Fee due Jul 19, 2027 Lapses if unpaid Jan 19, 2028 · High confidence | Zev Technologies, LLC | In force | Jul 19, 2027 | Jan 19, 2028 | High confidence | |
| US 9,335,117 | Lock Up System for a Handguard In force Fee due Nov 10, 2027 Lapses if unpaid May 10, 2028 · High confidence | Zev Technologies, LLC | In force | Nov 10, 2027 | May 10, 2028 | High confidence |
3 of 3 patents shown. Soonest fee due date first, then patent number.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.