Lapsed Sep 24, 2025 on the fee record · High confidence
20-year base term ends Feb 1, 2031
Third maintenance fee unpaid; grace period ended.
Held by Snell Holdings, LLC
Filed Feb 1, 2011 as application 13/019,255 · Granted Sep 24, 2013
Base term, 20 years from filing, plus 318 days of patent term adjustment (USPTO delay)
Today
Lapsed Sep 24, 2025
2011
2031
Clock starts
Feb 1, 2011
Feb 1, 2011
No longer in force
Sep 24, 2025
Sep 24, 2025
Granted
Sep 24, 2013
Sep 24, 2013
Term would have run to
Dec 16, 2031
Dec 16, 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
318
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 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.
5
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 Dec 16, 2031: its 20-year base term plus 318 days of term adjustment for 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 Feb 1, 2011, when this application, 13/019,255, was filed | Feb 1, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +318 days, USPTO patent term adjustment record | Dec 16, 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 | 2 of 3 maintenance fees paid | lapsed Sep 24, 2025 | High confidence |
| Computed term end | The steps above, in order | Sep 24, 2025 | High confidence |
This family
| US 8,542,999 | this patent Sep 2025 | Sep 2025 |
| US 9,042,729 | In force Feb 2031 | Feb 2031 |
| Application 14/720,362 | Abandoned not computed | not computed |
| Application 15/138,169 | Abandoned not computed | not computed |
| Application 15/439,841 | Abandoned not computed | not computed |
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 |
|---|---|---|---|
| Feb 1, 2011 Reel 25730, frame 398 | Barnard, Chris W; Myslinski, Piotr | Vello Systems, Inc. | Assignment of Assignor's Interest |
| May 28, 2013 Reel 30498, frame 219 | Vello Systems, Inc. | Venture Lending & Leasing VI, Inc.; Venture Lending & Leasing VII, Inc. | Security Agreement |
| May 28, 2013 reel/frame not recorded | Vello Systems, Inc. | Venture Lending & Leasing VI, Inc. | Security Agreement |
| May 28, 2013 reel/frame not recorded | Vello Systems, Inc. | Venture Lending & Leasing VII, Inc. | Security Agreement |
| Dec 15, 2014 Reel 34510, frame 459 | Treq Labs, Inc.; Venture Lending & Leasing | Treq Labs, Inc. | Assignment of Assignor's Interest |
| Sep 7, 2017 Reel 43522, frame 776 | Treq Labs, Inc. | Snell Holdings, LLC | Assignment of Assignor's 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 318 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
26
later US patents cite this one
That is top 25% 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.