Also listed on Vorbeck Materials Corporation, an earlier holder on the record. The recorded assignments below show how it moved.

Term ends no later than Mar 16, 2031 · 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 The Trustees of Princeton University and Vorbeck Materials Corporation

Filed Nov 19, 2010 as application 12/866,089 · Granted May 26, 2015

Base term plus 796 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Ends no later than Mar 16, 2031

2009 2031

Clock starts
Jan 9, 2009

Ends no later than
Mar 16, 2031

Granted
May 26, 2015

base term patent term adjustment 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

796

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.

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.

This patent's term runs 796 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. 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 9, 2009, when application PCT/US2009/030579, the earliest non-provisional in its chain, was filed (this one was filed Nov 19, 2010)	Jan 9, 2029	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+796 days, USPTO patent term adjustment record	Mar 16, 2031	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	2 of 3 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	no later than Mar 16, 2031	Medium confidence

This family

US 9,039,938	this patent no later than Mar 2031	no later than Mar 2031
Application 14/689,638	Abandoned not computed	not computed
Application 16/169,799	Abandoned not computed	not computed

3 of 4 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
Nov 30, 2010 Reel 25431, frame 115	Crain, John M.; Lettow, John S.; Aksay, Ilhan A.; Prud'homme, Robert K.; Korkut, Sibel	The Trustees of Princeton University; Vorbeck Materials Corporation	Assignment of Assignor's Interest
Nov 30, 2010 reel/frame not recorded	Korkut, Sibel; Aksay, Ilhan A.; Prud'homme, Robert K.; Crain, John M.; Lettow, John S.	The Trustees of Princeton University	Assignment of Assignor's Interest
Nov 30, 2010 reel/frame not recorded	Korkut, Sibel; Aksay, Ilhan A.; Prud'homme, Robert K.; Crain, John M.; Lettow, John S.	Vorbeck Materials Corporation	Assignment of Assignor's Interest
Jun 11, 2015 Reel 35887, frame 946	Princeton University	National Science Foundation	Confirmatory License

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 2031

Term ends no later than Mar 16, 2031. Maintenance fees still 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 796 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 Mar 16, 2031. We will not guess the cap.

Citations

later US patents cite this one

That is top 5% of utility patents granted in 2015 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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