Collateral for a security interest recorded Dec 2, 2024 (Twin Brook Capital Partners, LLC).
Lapsed Nov 14, 2025 on the fee record · Medium confidence
20-year base term ends Oct 18, 2030
Why Medium: A parent in the chain could not be resolved.
Second maintenance fee unpaid; grace period ended.
Held by Zonar Systems, Inc.
Filed Mar 11, 2014 as application 14/204,986 · Granted Nov 14, 2017
Base term, 20 years from filing, plus 359 days of patent term adjustment (USPTO delay)
Today
Lapsed Nov 14, 2025
2010
2031
Clock starts
Oct 18, 2010
Oct 18, 2010
No longer in force
Nov 14, 2025
Nov 14, 2025
Granted
Nov 14, 2017
Nov 14, 2017
Term would have run to
Oct 12, 2031
Oct 12, 2031
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
359
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
10
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Oct 12, 2031: its 20-year base term plus 359 days of term adjustment for prosecution delay. Confidence: Medium. 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 Oct 18, 2010, when application 12/906,615, the earliest non-provisional in its chain, was filed (this one was filed Mar 11, 2014); a parent in its chain could not be resolved (the next row) | Oct 18, 2030 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | +359 days, USPTO patent term adjustment record | Oct 12, 2031 | 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 | 1 of 3 maintenance fees paid | lapsed Nov 14, 2025 | High confidence |
| Computed term end | The steps above, in order | Nov 14, 2025 | Medium confidence |
This family
| Application 12/906,615 | Abandoned not computed | not computed |
| Application 14/204,962 | Abandoned not computed | not computed |
| US 9,815,681 | this patent Nov 2025 | Nov 2025 |
| Application 14/206,646 | Abandoned not computed | not computed |
| US 9,856,129 | Lapsed on the fee record Jan 2026 | Jan 2026 |
| US 9,828,233 | Lapsed on the fee record Nov 2025 | Nov 2025 |
| US 9,881,432 | Lapsed on the fee record Jan 2026 | Jan 2026 |
| US 10,489,998 | In force Aug 2031 | Aug 2031 |
8 of 10 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 |
|---|---|---|---|
| Nov 17, 2014 Reel 34274, frame 129 | Zonar Systems, Inc. | Bank Of America, N.a. | Patent Security Agreement |
| Dec 10, 2015 Reel 37259, frame 838 | McQuade, Charles Michael; Fadler, Rick | Zonar Systems, Inc. | Assignment of Assignor's Interest |
| 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 359 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
9
later US patents cite this one
That is above the median of utility patents granted in 2017 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.