Also listed on Hymite A/S, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Mar 27, 2028 · High confidence
20-year base term ended Apr 28, 2024
Held by Epistar Corporation
Filed Apr 28, 2004 as application 10/833,428 · Granted Mar 23, 2010
Base term plus 1429 days of patent term adjustment (USPTO delay)
Today
2004
2028
Clock starts
Apr 28, 2004
Apr 28, 2004
Term ends
Mar 27, 2028
Mar 27, 2028
Granted
Mar 23, 2010
Mar 23, 2010
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
1,429
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.
This patent's term runs 1429 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 28, 2004, when this application, 10/833,428, was filed | Apr 28, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1429 days, USPTO patent term adjustment record | Mar 27, 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 | Mar 27, 2028 | 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 |
|---|---|---|---|
| Aug 27, 2004 Reel 15089, frame 584 | Heschel, Matthias; Kilian, Arnd | Hymite A/S | Assignment of Assignor's Interest |
| Nov 30, 2010 Reel 25403, frame 566 | Hymite A/S | Taiwan Semiconductor Manufacturing Company, Ltd. | Assignment of Assignor's Interest |
| Sep 3, 2015 Reel 36543, frame 245 | Taiwan Semiconductor Manufacturing Company, Ltd. | Chip Star Ltd. | Assignment of Assignor's Interest |
| Mar 26, 2016 Reel 38107, frame 930 | Chip Star Ltd. | Epistar Corporation | Merger |
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
Mar 2028
Term ends Mar 27, 2028. No further fees fall due before then
Note
The 1429 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
12
later US patents cite this one
That is above the median of utility patents granted in 2010 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.