Also listed on Epistar Corporation, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Sep 5, 2030 · High confidence
20-year base term ends May 17, 2030
Held by Ennostar Corporation
Filed May 17, 2010 as application 12/781,194 · Granted May 14, 2013
Base term plus 111 days of patent term adjustment (USPTO delay)
Today
2010
2030
Clock starts
May 17, 2010
May 17, 2010
Term ends
Sep 5, 2030
Sep 5, 2030
Granted
May 14, 2013
May 14, 2013
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
111
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 111 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 May 17, 2010, when this application, 12/781,194, was filed | May 17, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +111 days, USPTO patent term adjustment record | Sep 5, 2030 | 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 | Sep 5, 2030 | High confidence |
This family
| US 8,440,500 | this patent Sep 2030 | Sep 2030 |
| Application PCT/US2010/035307 | 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 |
|---|---|---|---|
| Jul 28, 2010 Reel 24753, frame 239 | Su, Hwa; Chou, Hsi-yan; Huang, Chih Wei | Intematix Corporation | Assignment of Assignor's Interest |
| Apr 10, 2013 Reel 30192, frame 151 | Intematix Corporation | Interlight Optotech Corporation | Assignment of Assignor's Interest |
| Oct 27, 2015 Reel 36967, frame 623 | Intematix Hong Kong Co. Limited; Intematix Corporation | East West Bank | Security Interest |
| Aug 7, 2018 Reel 46577, frame 566 | Interlight Optotech Corporation | Epistar Corporation | Assignment of Assignor's Interest |
| Apr 14, 2022 Reel 59910, frame 304 | East West Bank | Intematix Hong Kong Co. Limited; Intematix Corporation | Release of Security Interest |
| Apr 14, 2022 reel/frame not recorded | East West Bank | Intematix Hong Kong Co. Limited | Release of Security Interest |
| Apr 14, 2022 reel/frame not recorded | East West Bank | Intematix Corporation | Release of Security Interest |
| Apr 22, 2026 Reel 75513, frame 783 | Epistar Corporation | Ennostar Corporation | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Sep 2030
Term ends Sep 5, 2030. No further fees fall due before then
Note
The 111 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
84
later US patents cite this one
That is top 10% of utility patents granted in 2013 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.