Term ends Jan 9, 2030 · Medium confidence
20-year base term ends Jan 5, 2030
Why Medium: A parent in the chain could not be resolved.
Held by Ennostar Corporation
Filed Feb 18, 2013 as application 13/769,819 · Granted Mar 8, 2016
Base term plus 4 days of patent term adjustment (USPTO delay)
Today
2010
2030
Clock starts
Jan 5, 2010
Jan 5, 2010
Term ends
Jan 9, 2030
Jan 9, 2030
Granted
Mar 8, 2016
Mar 8, 2016
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
4
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 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 4 days past its 20-year base term on prosecution delay. 2 of 3 maintenance fees are paid so far. Confidence: Medium. 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 Jan 5, 2010, when application 12/652,329, the earliest non-provisional in its chain, was filed (this one was filed Feb 18, 2013); a parent in its chain could not be resolved (the next row) | Jan 5, 2030 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | +4 days, USPTO patent term adjustment record | Jan 9, 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 | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Jan 9, 2030 | Medium confidence |
This family
| US 8,378,373 | In force Apr 2030 | Apr 2030 |
| US 9,281,459 | this patent Jan 2030 | Jan 2030 |
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 |
|---|---|---|---|
| May 3, 2013 Reel 30342, frame 116 | Wang, Tai Chun; Wen, Wei Chih | Huga Optotech, Inc. | Assignment of Assignor's Interest |
| Oct 3, 2016 Reel 39925, frame 601 | Huga Optotech Inc. | Epistar Corporation | Assignment of Assignor's Interest |
| Feb 18, 2026 Reel 75171, frame 402 | 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
Jan 2030
Term ends Jan 9, 2030. Maintenance fees still fall due before then
Note
The 4 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 2016 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.