Also listed on Envisics Ltd., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jan 11, 2034 · High confidence
20-year base term ends Dec 20, 2033
Held by Dualitas Ltd.
Filed Jun 19, 2015 as application 14/654,275 · Granted Sep 19, 2017
Base term plus 22 days of patent term adjustment (USPTO delay)
Today
2013
2034
Clock starts
Dec 20, 2013
Dec 20, 2013
Term ends
Jan 11, 2034
Jan 11, 2034
Granted
Sep 19, 2017
Sep 19, 2017
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
22
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.
7
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 22 days past its 20-year base term on prosecution delay. 2 of 3 maintenance fees are 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 Dec 20, 2013, when application PCT/GB2013/053403, the earliest non-provisional in its chain, was filed (this one was filed Jun 19, 2015) | Dec 20, 2033 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +22 days, USPTO patent term adjustment record | Jan 11, 2034 | 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 11, 2034 | High confidence |
This family
| US 9,766,456 | this patent Jan 2034 | Jan 2034 |
| US 10,228,559 | In force Dec 2033 | Dec 2033 |
| US 11,054,643 | In force Dec 2033 | Dec 2033 |
| US 12,013,533 | In force no later than Jan 2035 | no later than Jan 2035 |
| US 12,345,884 | In force Dec 2033 | Dec 2033 |
| Application 19/250,172 | Pending not computed | not computed |
6 of 7 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 |
|---|---|---|---|
| Jan 30, 2016 Reel 37627, frame 931 | Christmas, Jamieson; Masiyano, Dackson | Two Trees Photonics Limited | Assignment of Assignor's Interest |
| Feb 26, 2016 Reel 37940, frame 153 | Christmas, Jamieson; Masiyano, Dackson | Two Trees Photonics Limited | Corrective Assignment to Correct the Second Inventor Execution Date Previously Recorded at Reel: 037627 Frame: 0931. Assignor(S) Hereby Confirms the Assignment. |
| Dec 8, 2020 Reel 54581, frame 952 | Two Trees Photonics Ltd. | Envisics Ltd. | Assignment of Assignor's Interest |
| Aug 5, 2026 Reel 76113, frame 595 | Envisics 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
Jan 2034
Term ends Jan 11, 2034. Maintenance fees still fall due before then
Note
The 22 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
41
later US patents cite this one
That is top 10% of utility patents granted in 2017 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.