Also listed on Alpha Imaging Technology Corp., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Apr 26, 2028 · High confidence
20-year base term ends Apr 30, 2027
Held by Sigmastar Technology Ltd.
Filed Apr 16, 2010 as application 12/761,703 · Granted Jul 31, 2012
Base term plus 362 days of patent term adjustment (USPTO delay)
Today
2007
2028
Clock starts
Apr 30, 2007
Apr 30, 2007
Term ends
Apr 26, 2028
Apr 26, 2028
Granted
Jul 31, 2012
Jul 31, 2012
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
362
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 362 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 Apr 30, 2007, when application 11/741,785, the earliest non-provisional in its chain, was filed (this one was filed Apr 16, 2010) | Apr 30, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +362 days, USPTO patent term adjustment record | Apr 26, 2028 | 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 | Apr 26, 2028 | High confidence |
This family
| Application 11/741,785 | Abandoned not computed | not computed |
| US 8,233,057 | this patent Apr 2028 | Apr 2028 |
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 |
|---|---|---|---|
| Apr 16, 2010 Reel 24245, frame 944 | Yu, Chih-shih; Tu, Chih-ying | Alpha Imaging Technology Corp. | Assignment of Assignor's Interest |
| Jan 4, 2016 Reel 37401, frame 611 | Alpha Imaging Technology Corp. | Mstar Semiconductor, Inc. | Assignment of Assignor's Interest |
| Feb 7, 2018 Reel 44851, frame 187 | Mstar Semiconductor, Inc. | Sigmastar Technology Corp. | Assignment of Assignor's Interest |
| Jul 16, 2019 Reel 49762, frame 321 | Sigmastar Technology Corp. | Xiamen Sigmastar Technology Ltd. | Assignment of Assignor's Interest |
| Oct 25, 2021 Reel 57889, frame 55 | Xiamen Sigmastar Technology Ltd. | Sigmastar Technology Ltd. | 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
Apr 2028
Term ends Apr 26, 2028. No further fees fall due before then
Note
The 362 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2012 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.