Term ended Feb 23, 2022 · High confidence
20-year base term ended Jun 26, 2021
USPTO later recorded it as expired for non-payment on Jun 16, 2025.
Held by Ada-Es, Inc.
Filed May 21, 2010 as application 12/785,184 · Granted May 14, 2013
Base term plus 242 days of patent term adjustment (USPTO delay)
Today
Term ended Feb 23, 2022
2001
2026
Clock starts
Jun 26, 2001
Jun 26, 2001
Term ended
Feb 23, 2022
Feb 23, 2022
Granted
May 14, 2013
May 14, 2013
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
242
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
9
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 242 days past its 20-year base term on prosecution delay. 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 May 21, 2010) | Jun 26, 2021 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +242 days, USPTO patent term adjustment record | Feb 23, 2022 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | term ended | High confidence |
| USPTO status record | Recorded as expired for non-payment on Jun 16, 2025, after the term ended | no change | High confidence |
| Computed term end | The steps above, in order | Feb 23, 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 | this patent Feb 2022 | Feb 2022 |
| US 8,293,196 | Term ended Oct 2026 | Oct 2026 |
| US 9,951,287 | Term ended 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 |
|---|---|---|---|
| Oct 27, 2010 Reel 25205, frame 413 | Baldrey, Kenneth E.; Sjostrom, Sharon; French, Nina Bergan; Durham, Michael D.; Johnson, Stephen Allen; Wurster, John; Comer, John Philip | Ada Environmental Solutions, LLC | Assignment of Assignor's Interest |
| Dec 19, 2011 Reel 27411, frame 561 | Ada Environmental Solutions LLC | Ada-Es, Inc. | Assignment of Assignor's Interest |
| Oct 23, 2015 Reel 36865, frame 55 | Ada-Es, Inc. | Wilmington Trust, National Association, as Collateral Agent | Security Interest |
| Jul 1, 2016 Reel 39064, frame 268 | Wilmington Trust, National Association | Ada-Es, Inc. | Release of 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 |
| 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 242 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
81
later US patents cite this one
That is top 10% of utility patents granted in 2013 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.