Lapsed Apr 15, 2026 on the fee record · High confidence

Computed 20-year base term

Third maintenance fee unpaid; grace period ended.

Held by Edisonled LLC

Filed Aug 26, 2009 as application 12/547,571 · Granted Apr 15, 2014

Base term, 20 years from filing, plus 154 days of patent term adjustment (USPTO delay)

Today

Lapsed Apr 15, 2026

2009 2030

Clock starts
Aug 26, 2009

No longer in force
Apr 15, 2026

Granted
Apr 15, 2014

Term would have run to
Jan 27, 2030

base term patent term adjustment after the term ends 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

154

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.

Family applications on record here

Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

Its term would have run to Jan 27, 2030: its 20-year base term plus 154 days of term adjustment for prosecution delay. 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 Aug 26, 2009, when this application, 12/547,571, was filed	Aug 26, 2029	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+154 days, USPTO patent term adjustment record	Jan 27, 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	lapsed Apr 15, 2026	High confidence
Computed term end	The steps above, in order	Apr 15, 2026	High confidence

This family

US 8,698,175	this patent Apr 2026	Apr 2026
US 9,029,898	In force Aug 2029	Aug 2029

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
Aug 26, 2009 Reel 23145, frame 832	Cheng, Wei-kang; Li, Jia-lin; Pan, Shyi-ming; Huang, Kuo-chin	Formosa Epitaxy Incorporation	Assignment of Assignor's Interest
Sep 26, 2016 Reel 40149, frame 765	Formosa Epitaxy Incorporation	Epistar Corporation	Assignment of Assignor's Interest
Dec 12, 2024 Reel 69604, frame 414	Epistar Corporation	Edisonled LLC	Assignment of Assignor's Interest

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

Note

The 154 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us

Citations

later US patents cite this one

That is below 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.

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