Term ends Mar 12, 2033 · High confidence

Computed 20-year base term

Held by Dualitas Ltd.

Filed Jul 24, 2017 as application 15/658,052 · Granted Feb 23, 2021

Base term plus 607 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Term ends Mar 12, 2033

2011 2033

Clock starts
Jul 14, 2011

Term ends
Mar 12, 2033

Granted
Feb 23, 2021

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

607

Days of term adjustment

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

None

Terminal disclaimer

No disclaimer on this record.

1 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 607 days past its 20-year base term on prosecution delay. 1 of 3 maintenance fees is paid so far. 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 Jul 14, 2011, when application PCT/GB2011/051328, the earliest non-provisional in its chain, was filed (this one was filed Jul 24, 2017)	Jul 14, 2031	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+607 days, USPTO patent term adjustment record	Mar 12, 2033	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	1 of 3 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	Mar 12, 2033	High confidence

This family

US 9,715,215	In force May 2033	May 2033
US 10,928,776	this patent Mar 2033	Mar 2033
US 11,635,621	In force no later than Oct 2031	no later than Oct 2031

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
Dec 14, 2017 Reel 44396, frame 110	Christmas, Jamieson; Masiyano, Dackson	Two Trees Photonics Limited	Assignment of Assignor's Interest
Jan 26, 2021 Reel 55028, frame 193	Two Trees Photonics Ltd.	Dualitas 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.

What's changing

Mar 2033

Term ends Mar 12, 2033. Maintenance fees still fall due before then

Note

The 607 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 above the median of utility patents granted in 2021 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.

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