Maintenance fees coming due
3 maintenance fees come due in the 12 months from Nov 15, 2026, the next on Jan 4, 2027. Unpaid by Jul 6, 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 11,692,515 | Liquid Rocket Engine Tap-Off Power Source In force Fee due Jan 4, 2027 Lapses if unpaid Jul 6, 2027 · High confidence | Firefly Aerospace Inc. | In force | Jan 4, 2027 | Jul 6, 2027 | High confidence | |
| US 11,746,729 | Method or Manufacturing a Liquid Rocket Engine Thruster Body In force Fee due Mar 5, 2027 Lapses if unpaid Sep 7, 2027 · High confidence | Firefly Aerospace Inc. | In force | Mar 5, 2027 | Sep 7, 2027 | High confidence | |
| US 11,846,251 | Liquid Rocket Engine Booster Engine with Combustion Gas Fuel Source In force Fee due Jun 19, 2027 Lapses if unpaid Dec 20, 2027 · High confidence | Firefly Aerospace Inc. | In force | Jun 19, 2027 | Dec 20, 2027 | 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.