Collateral for a security interest recorded Dec 2, 2024 (Twin Brook Capital Partners, LLC).
Term ended Feb 8, 2022 · High confidence
20-year base term ended Sep 11, 2021
Held by Zonar Systems, Inc.
Filed Aug 11, 2004 as application 10/915,957 · Granted Jul 7, 2009
Base term plus 655 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Term ended Feb 8, 2022
2001
2026
Clock starts
Sep 11, 2001
Sep 11, 2001
Term ended
Feb 8, 2022
Feb 8, 2022
Granted
Jul 7, 2009
Jul 7, 2009
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
655
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 6,671,646, US 6,804,626.
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.
71
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 655 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. All three maintenance fees were paid, so no fee lapse ended it. 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 Sep 11, 2001, when application 09/951,104, the earliest non-provisional in its chain, was filed (this one was filed Aug 11, 2004) | Sep 11, 2021 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +655 days, USPTO patent term adjustment record | Jun 28, 2023 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 6,671,646, US 6,804,626) | capped to Feb 8, 2022 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Feb 8, 2022 | High confidence |
This family
| US 6,671,646 | Term ended Feb 2022 | Feb 2022 |
| US 6,804,626 | Term ended Feb 2022 | Feb 2022 |
| US 7,117,121 | Term ended Nov 2021 | Nov 2021 |
| US 7,557,696 | this patent Feb 2022 | Feb 2022 |
| Application 11/133,139 | Abandoned not computed | not computed |
| US 7,362,229 | Term ended Jul 2022 | Jul 2022 |
| US 7,564,375 | Term ended Nov 2022 | Nov 2022 |
| US 7,680,595 | Term ended Aug 2022 | Aug 2022 |
8 of 71 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 21, 2004 Reel 15915, frame 537 | Brinton, Brett A.; Brinton, William, JR.; Mayer, Daniel R.; Manegold, Eric S.; McQuade, Charles Michael | Zonar Compliance Systems, LLC | Assignment of Assignor's Interest |
| May 15, 2008 Reel 20941, frame 903 | Zonar Compliance Systems, LLC | Zonar Systems, Inc. | Merger |
| Nov 17, 2014 Reel 34274, frame 129 | Zonar Systems, Inc. | Bank Of America, N.a. | Patent Security Agreement |
| Oct 28, 2016 Reel 40512, frame 99 | Bank Of America, N.a. | Zonar Systems, Inc. | Release of Security Interest |
| Dec 2, 2024 Reel 69466, frame 630 | Zonar Systems, Inc. | Twin Brook Capital Partners, LLC, as Agent | 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
Note
The 655 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 6,671,646, US 6,804,626.
Citations
77
later US patents cite this one
That is top 10% of utility patents granted in 2009 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.