Also listed on NXP USA, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Dec 6, 2026 · High confidence
20-year base term ended Jun 29, 2025
Held by Sigmatel, LLC
Filed Jun 29, 2005 as application 11/170,485 · Granted Mar 24, 2009
Base term plus 525 days of patent term adjustment (USPTO delay)
Today
2005
2026
Clock starts
Jun 29, 2005
Jun 29, 2005
Term ends
Dec 6, 2026
Dec 6, 2026
Granted
Mar 24, 2009
Mar 24, 2009
base term
patent term adjustment
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
525
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 525 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 Jun 29, 2005, when this application, 11/170,485, was filed | Jun 29, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +525 days, USPTO patent term adjustment record | Dec 6, 2026 | 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 | Dec 6, 2026 | High confidence |
This family
| US 7,508,686 | this patent Dec 2026 | Dec 2026 |
| Application PCT/US2005/039045 | PCT application no patent term | no patent term |
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 |
|---|---|---|---|
| Jun 29, 2005 Reel 16746, frame 907 | May, Marcus W. | Sigmatel, Inc. | Assignment of Assignor's Interest |
| Jul 9, 2008 Reel 21212, frame 372 | Sigmatel, Inc. | Citibank, N.a. | Security Agreement |
| May 19, 2009 Reel 22703, frame 405 | Freescale Semiconductor, Inc. | Citibank, N.a. | Security Agreement |
| Mar 16, 2010 Reel 24079, frame 406 | Sigmatel, LLC | Citibank, N.a. | Security Agreement |
| May 10, 2010 Reel 24358, frame 439 | Sigmatel, LLC | Citibank, N.A., as Notes Collateral Agent | Security Agreement |
| Jun 17, 2013 Reel 30628, frame 636 | Sigmatel, LLC | Citibank, N.A., as Notes Collateral Agent | Security Agreement |
| Nov 12, 2013 Reel 31626, frame 218 | Sigmatel, LLC | Citibank, N.A., as Notes Collateral Agent | Security Agreement |
| Dec 21, 2015 Reel 37355, frame 838 | Citibank, N.A., as Collateral Agent | Sigmatel, Inc. | Patent Release |
| Dec 21, 2015 Reel 37354, frame 793 | Citibank, N.A., as Collateral Agent | Freescale Semiconductor, Inc. | Patent Release |
| Aug 15, 2016 Reel 39723, frame 777 | Citibank, N.A., as Collateral Agent | Sigmatel, LLC | Corrective Assignment to Correct the Assignee Name Previously Recorded at Reel: 037354 Frame: 0773. Assignor(S) Hereby Confirms the Patent Release. |
| Jul 26, 2017 Reel 43328, frame 351 | Sigmatel, LLC | NXP USA, Inc. | Merger |
| Aug 31, 2017 Reel 43735, frame 306 | Sigmatel, Inc. | Sigmatel, LLC | Change of Name |
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
Dec 2026
Term ends Dec 6, 2026. No further fees fall due before then
Note
The 525 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
6
later US patents cite this one
That is below the median 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.