Term ends no later than May 3, 2030 · Medium confidence

Computed 20-year base term

In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.

Held by Idemitsu Kosan Co., Ltd.

Filed Sep 23, 2011 as application 13/138,750 · Granted Apr 30, 2013

Base term plus 10 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Ends no later than May 3, 2030

2010 2030

Clock starts
Apr 23, 2010

Ends no later than
May 3, 2030

Granted
Apr 30, 2013

base term fee events Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

Days of term adjustment

Read from the USPTO patent term adjustment record, not recalculated here.

Unresolved

Terminal disclaimer

On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.

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.

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 10 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. All three maintenance fees are recorded paid; no more fees are due. 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 Apr 23, 2010, when application PCT/JP2010/002959, the earliest non-provisional in its chain, was filed (this one was filed Sep 23, 2011)	Apr 23, 2030	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+10 days, USPTO patent term adjustment record	May 3, 2030	High confidence
Terminal disclaimer cap	Disclaimer on file (approved), reference document not resolved	no cap applied, and none guessed	Medium 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	no later than May 3, 2030	Medium confidence

This family

US 8,431,250	this patent no later than May 2030	no later than May 2030
US 9,166,179	In force Jul 2031	Jul 2031
US 9,466,800	In force Apr 2030	Apr 2030
US 9,741,938	In force Apr 2030	Apr 2030
US 10,263,191	In force Apr 2030	Apr 2030
US 10,686,137	In force Apr 2030	Apr 2030
US 11,024,806	In force Apr 2030	Apr 2030
Application 17/243,909	Abandoned not computed	not computed

8 of 9 applications in this family shown, earliest filings first. 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
Sep 23, 2011 Reel 27080, frame 112	Mizuki, Yumiko; Funahashi, Masakazu; Kawamura, Masahiro	Idemitsu Kosan Co., Ltd.	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.

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

What's changing

May 2030

Term ends no later than May 3, 2030. No further fees fall due before then

Note

A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed

Note

The 10 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us

Open question

A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than May 3, 2030. We will not guess the cap.

Citations

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

This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.

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