63 patents currently held

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

10 more records may belong here and await a decision; they are not counted.

The next term ends in Nov 2028. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Nov 2028

Next term end

Patent families

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

202620272028202920302031 2032 2033 2034 2035 2036 203720382039 204020412042204320442045

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

Sorbent Compositions Having Amorphous Halogen Species for the Sequestration of Contaminants US 11,219,878

Cited by 21 later US patents, top 5% of utility patents granted in 2022 in our data. Protection runs to 2035.

Ends Aug 2035 · High confidence Also notable

Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes US 9,884,286

Cited by 35 later US patents, top 10% of utility patents granted in 2018 in our data, and renewed at every maintenance window due so far. Protection runs to 2031.

Ends Feb 2031 · High confidence Also notable

Additives for Mercury Oxidation in Coal-Fired Power Plants US 8,124,036

Cited by 48 later US patents, top 25% of utility patents granted in 2012 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2028.

Ends Nov 2028 · High confidence

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 4, 2026
The maintenance fee for Sorbent Compositions for Use in a Wet Scrubber Unit (US 10,307,706) comes due Dec 4, 2026. Unpaid by Jun 4, 2027, it lapses early.
2 fees due Jan 16 to 23, 2027 · next Jan 16
2 fees due Mar 5 to 24, 2027 · next Mar 5
4 fees due Apr 1 to 29, 2027 · next Apr 1
2 fees due May 5 to 21, 2027 · next May 5
1 fee due Jun 29, 2027
The maintenance fee for Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes (US 9,221,013) comes due Jun 29, 2027. Unpaid by Dec 29, 2027, it lapses early.
1 fee due Jul 19, 2027
The maintenance fee for Process to Reduce Emissions of Nitrogen Oxides and Mercury from Coal-Fired Boilers (US 9,238,782) comes due Jul 19, 2027. Unpaid by Jan 19, 2028, it lapses early.
1 fee due Sep 17, 2027
The maintenance fee for Method to Reduce Mercury, Acid Gas, and Particulate Emissions (US 10,589,292) comes due Sep 17, 2027. Unpaid by Mar 17, 2028, it lapses early.
1 fee due Oct 12, 2027
The maintenance fee for Method to Reduce Mercury, Acid Gas, and Particulate Emissions (US 9,308,493) comes due Oct 12, 2027. Unpaid by Apr 12, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

2 terms have ended since Aug 16, 2026

What they patent

The 5 largest of its 16 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Multi-Functional Composition of Matter for Rapid Removal of Mercury from a Flue Gas	23 in force	to Mar 2040
Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes	15 in force	to Feb 2032
Control of Wet Scrubber Oxidation Inhibitor and Byproduct Recovery	6 in force	to Apr 2033
Sorbent Compositions Having Pneumatic Conveyance Capabilities	3 in force	to Sep 2034
Process to Reduce Emissions of Nitrogen Oxides and Mercury from Coal-Fired Boilers	3 in force	to May 2032

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 8,124,036	Additives for Mercury Oxidation in Coal-Fired Power Plants held by Arq Solutions (Es), Inc. In force Term ends Nov 20, 2028 · High confidence	In force	Term ends Nov 20, 2028	High confidence
US 8,372,362	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 8,496,894	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 9,221,013	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 9,352,275	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 9,884,286	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 10,427,096	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 10,843,130	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 11,213,787	Method and System for Controlling Mercury Emissions from Coal-Fired Thermal Processes held by Arq Solutions (Es), Inc. In force Term ends Feb 4, 2031 · High confidence	In force	Term ends Feb 4, 2031	High confidence
US 9,149,759	Air Treatment Process for Dilute Phase Injection of Dry Alkaline Materials held by Arq Solutions (Es), Inc. In force Term ends Mar 10, 2031 · High confidence	In force	Term ends Mar 10, 2031	High confidence

10 of 63 patents shown.

Pro members see all 63.

Pro members: see all 63 patents

Also on record, not counted in the 63: 22 patents ended · 3 applications pending · 3 applications abandoned. 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.

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