Maintenance fees coming due
2 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 10,450,209 | Stable Salt-Free Polyaluminum Chlorosulfates In force Fee due Apr 22, 2027 Lapses if unpaid Oct 22, 2027 · High confidence | Usalco, LLC | In force | Apr 22, 2027 | Oct 22, 2027 | High confidence | |
| US 11,840,457 | System and Method for Production of Aluminum Chloride Derivatives In force Fee due Jun 12, 2027 Lapses if unpaid Dec 13, 2027 · High confidence | Usalco, LLC | In force | Jun 12, 2027 | Dec 13, 2027 | High confidence |
2 of 2 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.