Also listed on Alpha Imaging Technology Corp., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Mar 17, 2033 · High confidence
20-year base term ends Mar 17, 2033
Held by Sigmastar Technology Ltd.
Filed Mar 17, 2013 as application 13/845,082 · Granted Jun 3, 2014
Base term, 20 years from filing
Today
2013
2033
Clock starts
Mar 17, 2013
Mar 17, 2013
Term ends
Mar 17, 2033
Mar 17, 2033
Granted
Jun 3, 2014
Jun 3, 2014
base term
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.
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.
This patent's term is its 20-year base term, with no adjustment for 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 Mar 17, 2013, when this application, 13/845,082, was filed | Mar 17, 2033 | 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 | 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 | Mar 17, 2033 | High confidence |
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 |
|---|---|---|---|
| Mar 17, 2013 Reel 30025, frame 252 | Lin, Lai-ching; Tung, Chun-chao; Chen, Ya-chi | 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
Mar 2033
Term ends Mar 17, 2033. No further fees fall due before then
Citations
10
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.