Collateral for a security interest recorded Nov 1, 2021 (Twin Brook Capital Partners, LLC).
Term ends Aug 20, 2032 · High confidence
20-year base term ends Feb 28, 2031
Held by Ecotech, Inc.
Filed Feb 28, 2011 as application 13/036,432 · Granted Apr 29, 2014
Base term plus 539 days of patent term adjustment (USPTO delay)
Today
2011
2032
Clock starts
Feb 28, 2011
Feb 28, 2011
Term ends
Aug 20, 2032
Aug 20, 2032
Granted
Apr 29, 2014
Apr 29, 2014
base term
patent term adjustment
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
539
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
8
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 539 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Feb 28, 2011, when this application, 13/036,432, was filed | Feb 28, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +539 days, USPTO patent term adjustment record | Aug 20, 2032 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Aug 20, 2032 | High confidence |
This family
| US 8,708,672 | this patent Aug 2032 | Aug 2032 |
| US 9,551,343 | In force Feb 2031 | Feb 2031 |
| US 10,077,775 | In force Feb 2031 | Feb 2031 |
| US 10,487,836 | In force Feb 2031 | Feb 2031 |
| US 11,396,878 | In force Jun 2031 | Jun 2031 |
| US 11,867,184 | In force Feb 2031 | Feb 2031 |
| US 12,173,716 | In force Feb 2031 | Feb 2031 |
| US 12,680,547 | In force Feb 2031 | Feb 2031 |
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 |
|---|---|---|---|
| Apr 20, 2011 Reel 26154, frame 670 | Marks, Timothy; Clasen, Patrick; Lawyer, Justin | Ecotech, Inc. | Assignment of Assignor's Interest |
| Nov 16, 2015 Reel 37045, frame 568 | Ecotech, Inc. | M&T Bank | Security Interest |
| Nov 1, 2021 Reel 57976, frame 278 | Et Husk, LLC; Ecotech, LLC | Twin Brook Capital Partners, LLC, as Administrative Agent | Security Interest |
| May 22, 2026 Reel 74746, frame 270 | M&T Bank | Ecotech, 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Aug 2032
Term ends Aug 20, 2032. No further fees fall due before then
Note
The 539 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
23
later US patents cite this one
That is top 25% of utility patents granted in 2014 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.