Maintenance fees coming due
4 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Dec 6, 2026. Unpaid by Jun 7, 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 11,667,538 | Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates In force Fee due Dec 6, 2026 Lapses if unpaid Jun 7, 2027 · High confidence | Carbon Engineering ULC | In force | Dec 6, 2026 | Jun 7, 2027 | High confidence | |
| US 9,095,813 | Carbon Dioxide Capture Method and Facility In force Fee due Feb 4, 2027 Lapses if unpaid Aug 4, 2027 · High confidence | Carbon Engineering ULC | In force | Feb 4, 2027 | Aug 4, 2027 | High confidence | |
| US 10,421,039 | Capturing Carbon Dioxide In force Fee due Mar 24, 2027 Lapses if unpaid Sep 24, 2027 · High confidence | Carbon Engineering ULC | In force | Mar 24, 2027 | Sep 24, 2027 | High confidence | |
| US 10,519,041 | Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates In force Fee due Jun 30, 2027 Lapses if unpaid Jan 3, 2028 · High confidence | Carbon Engineering ULC | In force | Jun 30, 2027 | Jan 3, 2028 | High 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.