Term ended Jan 28, 2022 · High confidence

Computed 20-year base term

USPTO later recorded it as expired for non-payment on Jun 1, 2026.

Held by Ada-Es, Inc.

Filed Nov 5, 2014 as application 14/533,765 · Granted Apr 24, 2018

Base term plus 216 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Term ended Jan 28, 2022

2001 2026

Clock starts
Jun 26, 2001

Term ended
Jan 28, 2022

Granted
Apr 24, 2018

base term patent term adjustment after the term ends fee events 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

216

Days of term adjustment

Read from the USPTO patent term adjustment record, not recalculated here.

No effect

Terminal disclaimer

Resolved from the filed document, referencing US 8,919,266, to Jan 28, 2022. The term already ends on or before that date, so the cap shortened nothing.

1 of 1

Maintenance fees paid

One maintenance fee can end this term early, the one due 3.5 years from grant; the next one's grace period runs past the term end. This counts it if the record shows it paid.

Family applications on record here

Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

This patent's term runs 216 days past its 20-year base term on prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. Confidence: High. from the record

How we calculated this date

One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.

Step	Input	Date after this step	Confidence
Base term, 20 years from filing	Clock starts Jun 26, 2001, when application 09/893,079, the earliest non-provisional in its chain, was filed (this one was filed Nov 5, 2014)	Jun 26, 2021	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+216 days, USPTO patent term adjustment record	Jan 28, 2022	High confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 8,919,266)	resolves to Jan 28, 2022, no earlier than this term, so no change	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	1 of 1 maintenance fees paid	term ended	High confidence
USPTO status record	Recorded as expired for non-payment on Jun 1, 2026, after the term ended	no change	High confidence
Computed term end	The steps above, in order	Jan 28, 2022	High confidence

This family

US 6,729,248	Term ended Nov 2021	Nov 2021
US 6,773,471	Term ended Jun 2021	Jun 2021
US 7,332,002	Term ended Jun 2021	Jun 2021
US 8,919,266	Term ended Nov 2025	Nov 2025
US 8,124,036	In force Nov 2028	Nov 2028
US 8,439,989	Term ended Feb 2022	Feb 2022
US 8,293,196	Term ended Oct 2026	Oct 2026
US 9,951,287	this patent Jan 2022	Jan 2022

8 of 9 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.

Assignments

Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.

Recorded	Assignor	Assignee	Conveyance
May 22, 2015 Reel 35701, frame 211	Johnson, Stephen Allen; Wurster, John; Comer, John Philip	Ada Environmental Solutions, LLC	Assignment of Assignor's Interest
May 22, 2015 Reel 35701, frame 277	Ada Environmental Solutions LLC; Ada-Es, Inc.	Ada-Es, Inc.	Merger and Change of Name
Oct 26, 2015 Reel 36878, frame 72	Ada-Es, Inc.	Wilmington Trust, National Association, as Collateral Agent	Security Interest
Dec 7, 2018 Reel 47742, frame 652	Ada-Es, Inc.	The Bank of New York Mellon, as Administrative Agent	Notice of Grant of Security Interest in Patents
Jan 14, 2019 Reel 47991, frame 693	Wilmington Trust, National Association	Ada-Es, Inc.	Release of Security Interest
Jun 4, 2021 Reel 56483, frame 657	The Bank of New York Mellon, as Administrative Agent	Ada-Es, Inc.	Termination and Release of Security Interest in Patents
Feb 1, 2023 Reel 62622, frame 51	Ada Carbon Solutions, LLC; Ada-Es, Inc.	CF Global Credit, LP	Patent Security Agreement
Dec 27, 2024 Reel 69791, frame 980	CF Global Credit, LP, as Administrative Agent	Arq Solutions, LLC (F/K/A Ada Carbon Solutions, LLC); Arq Solutions (Es), Inc. (F/K/A Ada-Es, Inc.)	Release of Security Interest
Dec 27, 2024 reel/frame not recorded	CF Global Credit, LP, as Administrative Agent	Arq Solutions, LLC (F/K/A Ada Carbon Solutions, LLC)	Release of Security Interest
Dec 27, 2024 reel/frame not recorded	CF Global Credit, LP, as Administrative Agent	Arq Solutions (Es), Inc. (F/K/A Ada-Es, Inc.)	Release of Security Interest

Sources

Google Patents · The patent document at USPTO · Assignment records at USPTO

USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup

Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.

What's changing

Note

The 216 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us

Terminal disclaimer

A terminal disclaimer resolved from the filed document, referencing US 8,919,266, ends no earlier than this term, so it caps nothing.

Citations

later US patent cites this one

That is below the median of utility patents granted in 2018 in our data, the only group it is compared against. How we rank

Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

Low Sulfur Coal Additive for Improved Furnace Operation