26 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Aug 2029. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
4
Ending by 2030
Aug 2029
Next term end
13
Patent families
When these terms end
Held patents by the year their term ends
notable patents
fee due within 90 days
all others
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
Notable: the highest-ranked patents in this portfolio by citations and family size. Fee due within 90 days: a maintenance fee is due within 90 days of when this page was computed and not yet paid.
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Notable
Ends Mar 2040 · High confidence
Also notable
Ends Aug 2029 · High confidence
Also notable
Ends Sep 2034 · High confidence
Method and System for Synthesizing Fuel from Dilute Carbon Dioxide Source
US 11,655,421
The most cited patent in this portfolio, cited by 97 later US patents, top 1% of utility patents granted in 2023 in our data. Protection runs to 2040.
Carbon Dioxide Capture Method and Facility
US 9,095,813
Cited by 50 later US patents, top 10% of utility patents granted in 2015 in our data, and renewed at every maintenance window due so far. Protection runs to 2029.
Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates
US 9,637,393
Cited by 26 later US patents, top 25% of utility patents granted in 2017 in our data, and renewed at every maintenance window due so far. Protection runs to 2034.
Fee deadlines
Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.
- 1 fee due Dec 6, 2026The maintenance fee for Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates (US 11,667,538) comes due Dec 6, 2026. Unpaid by Jun 7, 2027, it lapses early.
- 1 fee due Feb 4, 2027The maintenance fee for Carbon Dioxide Capture Method and Facility (US 9,095,813) comes due Feb 4, 2027. Unpaid by Aug 4, 2027, it lapses early.
- 1 fee due Mar 24, 2027The maintenance fee for Capturing Carbon Dioxide (US 10,421,039) comes due Mar 24, 2027. Unpaid by Sep 24, 2027, it lapses early.
- 1 fee due Jun 30, 2027The maintenance fee for Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates (US 10,519,041) comes due Jun 30, 2027. Unpaid by Jan 3, 2028, it lapses early.
Recent changes
- 2 of the patents on this record were granted since Aug 16, 2026
What they patent
The 5 largest of its 13 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates | 6 in force | to Sep 2034 |
| Capturing Carbon Dioxide | 3 in force | to Jun 2037 |
| Carbon Dioxide Capture Method and Facility | 3 in force | to Sep 2029 |
| Air-To-Syngas Systems and Processes | 2 in force | to Mar 2041 |
| Method and System for Synthesizing Fuel from Dilute Carbon Dioxide Source | 2 in force | to Mar 2040 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 9,095,813 | Carbon Dioxide Capture Method and Facility In force · High confidence | In force | High confidence | |
| US 11,504,667 | Carbon Dioxide Capture Method and Facility In force · Medium confidence | In force | Medium confidence | |
| US 12,151,202 | Carbon Dioxide Capture Method and Facility In force · Medium confidence | In force | Medium confidence | |
| US 8,119,091 | Carbon Dioxide Capture In force · High confidence | In force | High confidence | |
| US 8,871,008 | Target Gas Capture In force · High confidence | In force | High confidence | |
| US 8,728,428 | Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates In force · High confidence | In force | High confidence | |
| US 10,519,041 | Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates In force · High confidence | In force | High confidence | |
| US 11,014,823 | Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates In force · High confidence | In force | High confidence | |
| US 11,667,538 | Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates In force · High confidence | In force | High confidence | |
| US 12,054,399 | Recovering a Caustic Solution via Calcium Carbonate Crystal Aggregates In force · High confidence | In force | High confidence |
Also on record, not counted in the 26: 18 applications pending. List them
Sources and methods
Compiled from USPTO application file histories, grants and recorded assignments, with the company's own names reviewed by hand. How this record was built
Portfolio grouped automatically from ownership conveyances to the names matched to this company, usually every name that begins with its own, so it counts patents an affiliate holds; each list row names the holder of record. Security interests are excluded and ambiguous records are not reviewed by hand.
Fee due within 90 days marks a patent with a maintenance fee due within 90 days of the date this page was computed and not yet recorded paid, so it can end earlier than the bar shows. A fee left unpaid ends the patent at the close of the six month grace period that follows its due date, not on the due date itself. It is not a prediction that the fee will be missed.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.