Collateral for a security interest recorded Jul 30, 2021 (Zilka Kotab, P.C.).
Lapsed Apr 3, 2026 on the fee record · High confidence
20-year base term ends Sep 30, 2034
Second maintenance fee unpaid; grace period ended.
Held by Duelight LLC
Filed Aug 31, 2016 as application 15/253,721 · Granted Apr 3, 2018
Base term, 20 years from filing
Today
Lapsed Apr 3, 2026
2014
2034
Clock starts
Sep 30, 2014
Sep 30, 2014
No longer in force
Apr 3, 2026
Apr 3, 2026
Granted
Apr 3, 2018
Apr 3, 2018
Term would have run to
Sep 30, 2034
Sep 30, 2034
base term
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
None
Term adjustment
No prosecution delay on this record.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 9,448,771, to Sep 30, 2034. The term already ends on or before that date, so the cap shortened nothing.
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.
17
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 Sep 30, 2034: its 20-year base term, with no adjustment for 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 Sep 30, 2014, when applications 14/503,210 and 14/503,224, the earliest non-provisional applications in its chain, were filed (this one was filed Aug 31, 2016) | Sep 30, 2034 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 9,448,771) | resolves to Sep 30, 2034, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 3 maintenance fees paid | lapsed Apr 3, 2026 | High confidence |
| Computed term end | The steps above, in order | Apr 3, 2026 | High confidence |
This family
| US 9,460,125 | Lapsed on the fee record Oct 2024 | Oct 2024 |
| US 9,361,319 | In force Sep 2034 | Sep 2034 |
| US 9,448,771 | Lapsed on the fee record Sep 2024 | Sep 2024 |
| US 9,218,662 | Lapsed on the fee record Dec 2023 | Dec 2023 |
| US 9,508,133 | Lapsed on the fee record Nov 2024 | Nov 2024 |
| US 9,460,118 | Lapsed on the fee record Oct 2024 | Oct 2024 |
| US 9,934,561 | this patent Apr 2026 | Apr 2026 |
| Application 15/913,742 | Abandoned not computed | not computed |
8 of 17 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 10, 2017 Reel 42321, frame 502 | Feder, Adam; Kindle, Brian; Rivard, William | Duelight LLC | Assignment of Assignor's Interest |
| Jul 30, 2021 Reel 57043, frame 301 | Duelight, LLC | Zilka Kotab, P.c. | 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.
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 9,448,771, ends no earlier than this term, so it caps nothing.
Citations
8
later US patents cite this one
That is above 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.