Also listed on Eturbotouch Technology Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Feb 22, 2032 · High confidence
20-year base term ends Sep 1, 2031
Held by Wistron Corporation
Filed Sep 1, 2011 as application 13/223,321 · Granted Mar 25, 2014
Base term plus 174 days of patent term adjustment (USPTO delay)
Today
2011
2032
Clock starts
Sep 1, 2011
Sep 1, 2011
Term ends
Feb 22, 2032
Feb 22, 2032
Granted
Mar 25, 2014
Mar 25, 2014
base term
patent term adjustment
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
174
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.
2
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 174 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 Sep 1, 2011, when this application, 13/223,321, was filed | Sep 1, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +174 days, USPTO patent term adjustment record | Feb 22, 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 | Feb 22, 2032 | High confidence |
This family
| US 8,680,419 | this patent Feb 2032 | Feb 2032 |
| US 9,170,695 | In force Dec 2031 | Dec 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 |
|---|---|---|---|
| Sep 1, 2011 Reel 26841, frame 478 | Wang, Kuei-ching; Lin, Hsing-chiao | Eturbotouch Technology Inc. | Assignment of Assignor's Interest |
| Mar 12, 2013 Reel 29978, frame 357 | Eturbotouch Technology Inc. | Wistron Corporation | Assignment of Assignor's Interest |
| Jun 30, 2025 Reel 71755, frame 497 | Wistron Corporation | Mammoth Licensing, LLC | Assignment of Assignor's Interest |
| May 7, 2026 Reel 75567, frame 824 | Mammoth Licensing, LLC | Wistron Corporation | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Feb 2032
Term ends Feb 22, 2032. No further fees fall due before then
Note
The 174 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
7
later US patents cite this one
That is above the median 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.