Maintenance fees coming due
4 maintenance fees come due in the 12 months from Nov 15, 2026, the next on May 28, 2027. Unpaid by Nov 29, 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 11,828,418 | Flex Plate Mount for High Pressure Tank In force Fee due May 28, 2027 Lapses if unpaid Nov 29, 2027 · Medium confidence | Quantum Fuel Systems LLC | In force | May 28, 2027 | Nov 29, 2027 | Medium confidence | |
| US 9,205,373 | Breather Layer for Exhausting Permeate from Pressure Vessels In force Fee due Jun 8, 2027 Lapses if unpaid Dec 8, 2027 · High confidence | Quantum Fuel Systems LLC | In force | Jun 8, 2027 | Dec 8, 2027 | High confidence | |
| US 9,234,625 | Concentric Shells for Compressed Gas Storage In force Fee due Jul 12, 2027 Lapses if unpaid Jan 12, 2028 · High confidence | Quantum Fuel Systems LLC | In force | Jul 12, 2027 | Jan 12, 2028 | High confidence | |
| US 10,533,673 | Composite Vessel Fire Protection System In force Fee due Jul 14, 2027 Lapses if unpaid Jan 14, 2028 · Medium confidence | Quantum Fuel Systems LLC | In force | Jul 14, 2027 | Jan 14, 2028 | Medium confidence |
4 of 4 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.